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17 results on '"Chunmiao, Zhang"'

1. Controllable Resistive Switching in ReS2/WS2 Heterostructure for Nonvolatile Memory and Synaptic Simulation

Author

Feihong Huang, Congming Ke, Jinan Li, Li Chen, Jun Yin, Xu Li, Zhiming Wu, Chunmiao Zhang, Feiya Xu, Yaping Wu, and Junyong Kang

Subjects
2D memristor, biological synaptic functions, gate and optical controllability, van der Waals heterostructure, Science
Abstract

Abstract Memristors with nonvolatile storage performance and simulated synaptic functions are regarded as one of the critical devices to overcome the bottleneck in traditional von Neumann computer architecture. 2D van der Waals heterostructures have paved a new way for the development of advanced memristors by integrating the intriguing features of different materials and offering additional controllability over their optoelectronic properties. Herein, planar memristors with both electrical and optical tunability based on ReS2/WS2 van der Waals heterostructure are demonstrated. The devices show unique unipolar nonvolatile behavior with high Roff/Ron ratio of up to 106, desirable endurance, and retention, which are superior to pure ReS2 and WS2 devices. When decreasing the channel length, the set voltage can be notably reduced while the high Roff/Ron ratios are retained. By introducing electrostatic doping through the gate control, the set voltage can be tailored in a wide range from 4.50 to 0.40 V. Furthermore, biological synaptic functions and plasticity, including spike rate‐dependent plasticity and paired‐pulse facilitation, are successfully realized. By employing optical illumination, resistive switching can also be modulated, which is dependent on the illumination energy and power. A mechanism related to the interlayer charge transfer controlled by optical excitation is revealed.

Published
2023
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4. High-efficient and gate-tunable spin transport in GaN thin film at room temperature

Author

Qipeng Wu, Di Lin, Mingyu Chen, Jin'an Li, Weilin Hu, Xuefeng Wu, Feiya Xu, Chunmiao Zhang, Yiyan Cao, Xu Li, Yaping Wu, Zhiming Wu, and Junyong Kang

Subjects
Physics and Astronomy (miscellaneous)
Abstract

The emerging semiconductor spintronics has offered a practical routine for developing high-speed and energy-efficient electronic and optoelectronic devices. GaN holds broad prospects for room-temperature spintronic applications due to its weak spin scattering and moderate spin–orbit coupling. However, the development of GaN-based spintronic devices is still hindered by the relatively low spin injection efficiency and gate controllability. In this study, gate-modulated spin transport was achieved in a highly spin-polarized GaN-based non-local spin valve. A maximum spin diffusion length of 510 nm and a high spin polarization of 14.1% was obtained with the CoFeB/MgO tunnel spin injector. By applying gate voltages from −3 to +3 V, the spin-dependent magnetoresistance can be tuned in the range of 1.6–3.9 Ω. The modulation is attributed to the controllable spin relaxation of electrons by the gate electric field. This work has demonstrated high spin polarization and exceptional electric controllability in GaN, pushing forward the research in spin field-effect transistors.

Published
2023
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5. The third Intensive Care Bundle with Blood Pressure Reduction in Acute Cerebral Haemorrhage Trial (INTERACT3): an international, stepped wedge cluster randomised controlled trial

Author

Lu Ma, Xin Hu, Lili Song, Xiaoying Chen, Menglu Ouyang, Laurent Billot, Qiang Li, Alejandra Malavera, Xi Li, Paula Muñoz-Venturelli, Asita de Silva, Nguyen Huy Thang, Kolawole W Wahab, Jeyaraj D Pandian, Mohammad Wasay, Octavio M Pontes-Neto, Carlos Abanto, Antonio Arauz, Haiping Shi, Guanghai Tang, Sheng Zhu, Xiaochun She, Leibo Liu, Yuki Sakamoto, Shoujiang You, Qiao Han, Bernard Crutzen, Emily Cheung, Yunke Li, Xia Wang, Chen Chen, Feifeng Liu, Yang Zhao, Hao Li, Yi Liu, Yan Jiang, Lei Chen, Bo Wu, Ming Liu, Jianguo Xu, Chao You, Craig S Anderson, Thompson Robinson, J. Jaime Miranda, Craig S. Anderson, Adrian Parry-Jones, Nikola Sprigg, Sophie Durrans, Caroline Harris, Ann Bamford, Olivia Smith, Robert Herbert, Christopher Chen, William Whiteley, Rong Hu, Jayanthi Mysore, Yao Zhang, Stephen Jan, Hueiming Liu, Lingli Sun, Honglin Chu, Anila Anjum, Francisca Gonzalez Mc Cawley, Alejandra Del Rio, Bruna Rimoli, Rodrigo Cerantola, Thanushanthan Jeevarajah, Madhushani Kannangara, Andrene Joseph, Chamath Nanayakkara, Chunmiao Zhang, Zhao Yang, Brook Li, Zhuo Meng, Yi Ning, Le Dong, Manuela Armenis, Joyce Lim, Helen Monaghan, Rui Luo, Guojuan Cheng, Yilin Dong, Ziqin Liu, Shuihong Wang, Ying Zhang, Jipeng Cheng, Hui Shi, Wenjing Li, Langming Mou, Ping Yi, Xue Chen, Shalomi Weerawardena, Poornima Ellawala, Enalee Ranasinghe, Chrishmi Rodrigo, Kolawala Wahab, Sunday Adeniyi, Jeyaraj Pandian, Megha Khanna, Paula Muñoz Venturelli, Francisca González, Francisca Urrutia Goldsack, Dilshad Begum, Octavio Pontes-Neto, Millene Camilo, Francisco Dias, Octavio Vincenzi, Carla Moro, Renata Santos, Nara Texeira, Alexandre Longo, Rafaela Liberato, Sheila Martins, Arthur Pille, Bruna Chwal, Isabel Silva, Natacha Titton, Gustavo Weiss, Daissy Mora, Magda Ouriques, Leonardo Carbonera, Rodrigo Bazan, Gabriel Modolo, Fernanda Winckler, Luana Miranda, Juli Souza, Alexis Rojo, Wilhelm Uslar, Lorena Medel, Javiera Lopez, Diego Herrero, Pablo Lavados, Barbara Vargas Latorre, Nathalie Conejan, Tomas Esparza, Patricio Sotomayor, Denisse Wenger, Juan Pablo Gigoux, Aldo Letelier, Lilian Acevedo, Vivianne Moya, Cristian Figueroa, Nicol Vallejos, Rodrigo Guerrero, Mauricio Velasquez, Jose Vallejos, Kimerly Pallauta, Tamara Santibanez, Angelo Queirolo, Andrea Lobos, Yongming Jiang, Weimin Li, Wei Huang, Ke Luo, Gangying Liu, Guang Yang, Hongtao Jiang, Xu Zhang, Hongyan Jing, Bo Pu, Dong Lv, Hui Kang, Qiuping Hu, Xiaoming Jiang, Yanli Chen, Shenghua Yang, Jianjun He, Zongping Li, Gang Cheng, Hailin Huang, Xiaoyi Wang, Jianqiong Lin, Minhui Chen, Chenghao Yang, Hao Ding, Yunliang Deng, Fei Luo, Rongjun Zhang, Xiaofeng Wang, Hongbing Zhang, Xiaoliang Yang, Yang Zhang, Chengyi Yang, Yu He, Feng Liu, Rongjie Wang, Yuhui Zhang, Xiaodong Xin, Bin Feng, Wanru Hao, Chang Song, Yun Guo, Dehua Jiang, Jie Chen, Changtong Tang, Hongliang Zhu, Xin Li, Jin Cui, Haidong Xu, Boyang Li, Fusheng Tang, Yuanbin Li, Min Gao, Bo Yang, Xuejun Xu, Bing Deng, Yi Zheng, Yuanhong Ge, Keyu Chen, Yang Liu, Xinshen Li, Tingting Zhong, Jianfeng Xu, Hai Zhang, Jiyue Wang, Jianxin Zhu, Hanyu Sun, Fuhua Yu, Xueguang Zhang, Mingsen Zhang, Bin Wang, Yiming Ma, Donglin Jiang, Jun Zhou, Cong Liu, Wenhong Nie, Mingguo Li, Tao Tian, Yong Li, Mingfang He, Xiaolong Tu, Zhengjun Wu, Hong Liu, Dongsheng Zhong, Rongcai Jiang, Jian Sun, Ye Tian, Yingsheng Wei, Shuo An, Pingbo Wei, Le Luo, Bin Lin, Gang Liu, Yan Wen, Qiang Cai, Qianxue Chen, Pan Lei, Zhiyang Li, Meifang Zhang, Jiaquan He, Yan Chen, Jun Liu, Xinghai Liu, Junyan Li, Min Chen, Jing Wang, Bingzhi Zhou, Baichun Ye, Jiancheng Zhang, Manyuan Zhang, Xuming Pan, Xiaoxiang Yu, Jian Xu, Qingbao Xiao, Yuefei Wang, Liang Tao, Lin Shi, Niandong Zheng, Guoliang You, Bo Lei, Shu Chen, Honggang Wu, Jin Hu, Jianlan Zhao, Jian Yu, Qiang Yuan, Zhuoying Du, Xielin Tang, Qianke Li, Shenghua Liu, Feilong Yang, Kui Xiao, Chao Luo, Guang Wang, Xudong Che, Zhipeng Teng, Wenwu Wan, Jun Li, Yu Liu, Mingbo Fan, Tao Zhang, Lun Cai, Yuan Ma, Zhifeng Ma, Bin Li, Linlin He, Jinghui Li, Weibing Zhang, Shuxin Zhang, Hongzhen Zhang, Yingguang Dai, Jun Lei, Lei Mao, Yiyang Huang, Zhi Zhou, Ping Chen, Fang Chen, Pan Wei, Tiangui Li, Honglin Chen, Mengfei Zeng, Kejie Mou, Jun Xue, Yong Jiang, Xiaoping Tang, Tao Chen, Yalan Zhang, Yanbing Xu, Yuchen Gu, Yujun Zhao, Bin Yang, Peng Kuai, Xi Wang, Yuwang Yang, Xueling Hu, Huitian Zhang, Yintao Yang, Weifeng Wang, Junyi Zhang, Wei Cheng, Xiaoxue Zhang, Xiaowen Ma, Qin He, Li Zhang, Rong Gao, Huixiang Liu, Jingwei Ye, Ping Xu, Xin Wu, Yuan Yuan, Peng Zou, Zhen Zhang, Jiyong Cheng, Zhangming Zhou, Yijun Zeng, Zhang Liang, Deming Du, Shui Yu, Yongjun Cao, Jiaping Xu, Zhichao Huang, Dongqin Chen, Wenfeng Xiao, Li Zhu, Miao Yuan, Yuhai Wang, Dongliang Shi, Xu Hu, Dingchao Xiang, Like Shi, Hongqin Wang, Liu Yang, Wang Miao, Yiyi Hu, Yuchun Zhao, Xi Hu, Weiduo Zhou, Chao Sun, Dong Tang, Kun Yao, Jin You, Shishi Chen, Jianmin Yao, Huanmei Li, Jinmei Liu, Ailin Bai, Yong Yi, Qingshan Deng, Peng Luo, Han Wang, Jingcheng Jiang, Qingwei Yang, Shunpo He, Jun Wang, Yu Chen, Hua He, Yuyang Deng, Zhikai Cao, Xuxia Yi, Jinbiao Luo, Shuang Luo, Min Gong, Li Liu, Xuejun Gao, Jia Liu, Li'e Wu, Jia Zhang, Hongying Sun, Xinhui Li, Lu Jia, Jianbing Wu, Jie Zhang, Huajun Zhang, Chunfu Du, Shun Li, Xiaobin Yang, Jie He, Lei Liao, Gezhi Zhou, Wentao Dong, Yunxiang Chen, Xiaofeng Lin, Xujian Shui, Peng Zhang, Yuan Zhao, Hongli Yang, Wenbin Zhao, Xiaoyi Zhang, Jincao Chen, Qian Wu, Xuan Dai, Baogui Tang, Yinjuan Wang, Tao Liu, Haixia Zhang, Faliang Duan, Ming Luo, Qingfang Jiao, Guoliang Lei, Dong Wang, Chunwang Song, Haopeng Tan, Feng Ye, Xinghu Qin, Xiaolong Liang, Junling Liu, Lang Yang, Jie Yang, Yapeng Lin, Qian Yang, Xuntai Ma, Yinkuang Qi, Baogen Pan, Caixia Jiang, Zhanying Ye, Ce Dong, Xiongfei Yue, Xiaopeng Yang, Tuoheti Maimaitiyiming, Jun Dong, Yonggang Wu, Feng Gao, Deqiang Zhao, Xinghai Zhang, PengJun Wang, Hongbo Jiang, Jianping Li, Wei Zhang, Jing Chen, Haibo Tong, Yonghong Wang, Kaipeng Qiao, Fuyou Guo, Mingchu Zhang, Yan Hu, Mengzhao Feng, Dengpan Song, Yi Zuo, Shangjun Chen, Chao Qian, Baoming Li, Jingku Ma, Sunfu Zhang, Bin Kong, Xingyu Dong, Sheng Fang, Bin Lu, Yang Li, Yongling Yang, Hong Yu, Huaiyu Sun, Yue Wang, Weimin Wang, Tong Li, Shengli Li, Zhiming Xu, Yongyi Wang, Qiang Dong, Yuping Tang, Heling Chu, Ying Lu, Zhong Wang, Xiaoou Sun, Jianhua Zhao, Shuaifeng Yang, Xiying Qian, Aralikatte Onkarappa Saroja, Ravishankar Naik k, Sandip Chindhi, Nakul Pampaniya, Kurubara Amaresh, Thomas Iype, Dileep R, Reeja Rajan, Praveen Panicker, Rupjyoti Das, Nupur Choudhury, Pankaja Gohain, Jemin Webster, Biyol Pakma, Lalbiak Sangi, Ivy Sebastian, Gaurav Aggrawal, Komal Raj, Deepankshi Rajoura, Sulena Singh, Varun Aggrawal, Amit Narang, Vanesa Cano-Nigenda, Diego López-Mena, Héctor Valdez-Ruvalcaba, Roberto Toledo-Treviño, Reginald Obiako, Sani Abubakar, Oguike Emeka, Balogun Olayemi, Melika Lois, Ibinaiye Philip, Olurishe Comfort O, Njideka Okubadejo, Osigwe Agabi, Oluwadamilola Ojo, Kolawole Wahab, Abiodun Bello, Oyinloye Ibukun, Olufemi Sanayaolu, Abdulraheem Jimoh, Shahid Waheed, Dr.Ayeesha Kamal, Raja Farhat Shoaib, Fizza Orooj, Sadaf Majid, Taskeen Zehra, Abdus Salam Khan, Ravi Shanker, Nadir Ali Syed, Nashwa Ahmad, Ana Valencia, Danny Barrientos, Jorge Ramirez, Pilar Calle, Dilum Palliyeguruge, Sumudu Muthucumarana, Shiroma Ratnayaka, Dilhara Ganihiarachchi, Arundathi Bandaranayake, S.D.B Somaratne, Saumya Narayana, Sithara Gallage, Bimsara Senanayake, Udari Samarasiri, Dunya Luke, Mythily Sivapathasundaram, Vithoosan Sahadevan, Amani Rasmi, Yuran Deshaka, Nilukshi Fernando, Aruna Munasinghe, Kapilanga Rathnapriya, A.S Nissanka, Kanchana Karunathilake, Isuru Gayan, Kaminda Wijenayake, Hasitha Gunasekara, Jagath Vidyarathne, Ajantha Keshavaraj, Kanagasabapathy Janarthanan, Arhivalaky Gerald Jeevathasan, Sivaram Sivamainthan, Mathyamuthan John Priyanth, Abirami John Priyanth, Thambippillai Rajendiran, Sanjeewa Alwis, Nushara Gunasekare, Vasundara Liyanarachchi, Athula Dissanayake, Wimalasiri Mewa Uluwattage, Gimhani Ratnayake, Charika Rajinee, Sakura Jayawardana, Janaka Peiris, Ranjith Wicramasinghe, Chamila Fernando, Jessie Abbas, Nethmini Withanage, Makaranda Bandara, Duy Ton Mai, Van Chi Nguyen, Viet Phuong Dao, Xuan Trung Vuong, Tien Dung Nguyen, Trung Hieu Dinh, Ha Quan Phan, Quoc Viet Bui, Dinh Tho Phung, Quang Tho Pham, Dinh Dai Pham, Duc Thuan Do, Phuc Duc Dang, Minh Duc Dang, Dang Hai Nguyen, Thi Phuong Nga Nguyen, Quoc Huy Nguyen, Quoc Dai Pham, Quoc Vinh Chau, Vinh Thy Van Tai, Tran Vinh Le, Cong Tri Le, Ha Mai Khuong Tran, Huu Khanh Nguyen, Hoang Minh Thao Ngyen, Duc Chien Vo, Thai My Phuong Nguyen, Trung Thanh Tran, Thi Hanh Vi Vo, Hao Nhien Cao, Ba Thang Nguyen, Thi Ngoc Suong Le, Thien Duc La, Chi Duc Pham, and Huy Thai

Subjects
General Medicine
Published
2023
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10. An electrically and optically controllable memristor with synaptic plasticity based on scalable monolayer ReS2/WS2 heterostructure

Author

Yaping Wu, Huang Feihong, Congming Ke, Li Chen, Jun Yin, Xu Li, Zhiming Wu, Chunmiao Zhang, Feiya Xu, and Junyong Kang

Abstract

Memristors with non-volatile storage performance and simulated synaptic functions are regarded as one of the critical devices to overcome the bottleneck in traditional von Neumann computer architecture. van der Waals heterostructures integrating excellent properties of two-dimensional semiconductor materials, possessing controllable optoelectronic properties and high compatibility with conventional microelectronic technology, have paved a new way for the development of advanced memristors. Herein, we demonstrate a two-dimensional planar memristor with both electrical and optical controllability based on ReS2/WS2 van der Waals heterostructure. The device shows a typical unipolar non-volatile behavior with a high Ron/Roff ratio, multiple tunable resistance states, and desirable endurance and retention. It also successfully realizes biological synaptic functions and plasticity, including spike rate-dependent plasticity and paired-pulse facilitation. Furthermore, the developed device shows a significant gate controllability and a remarkable optical tunability. The superior performance is attributed to the unique optoelectronic property and the interlayer interaction in the heterostructure. The research presented here demonstrates the potential of two-dimensional van der Waals heterostructures for high-performance memristor applications and further developments in modelling biological synapses.

Published
2022
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11. Controllable and enormous spin splitting in antiferromagnetic MnPSe3 through interfacial coupling with Janus MoSSe

Author

Yingqiu Li, Zongnan Zhang, Xuefeng Wu, Yaping Wu, Xu Li, Chunmiao Zhang, Yiyan Cao, Zhiming Wu, and Junyong Kang

Subjects
Acoustics and Ultrasonics, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

The manipulation of spin and valley degree of freedom in two-dimensional materials is desirable for emerging applications in next-generation electronics. Here, we report a regulation of the spin splitting in monolayer antiferromagnetic MnPSe3 through stacking van der Waals (vdW) heterostructures with transition-metal dichalcogenides (TMDs). Different TMDs including Janus MoSSe, MoSe2, and MoS2 are engaged and the spin and valley dependences on stacking configurations, interfacial atoms, and interlayer spacings are comprehensively investigated based on first-principles calculations. The results show that spin degeneracy of MnPSe3 can be lifted through the interfacial interaction in the vdW heterostructures. Compared with the MnPSe3 interfacing with traditional TMDs (MoSe2 and MoS2), those with Janus TMDs (MoSSe or MoSeS) have larger spin splitting. A maximal spin splitting of 50.8 meV at valence band maximum is achieved in MoSSe/MnPSe3 heterostructure, and such splitting is further enhanced to 243.0 meV when the interlayer spacing is reduced to 2.9 Å. It is found that the different hybridizations between the d-orbitals of the two inequivalent Mn atoms in MnPSe3 and the above TMDs lead to the occurrence of net magnetic moments, and thus induce spin splitting. This work paves a novel way to modify the spin-valley properties of two-dimensional semiconductors.

Published
2023
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12. Controlling the resistive switching polarity in ReS2 lateral memristors through the modulation of crystal structures

Author

Congming Ke, Feihong Huang, Zongnan Zhang, Xu Li, Zhiming Wu, Chunmiao Zhang, Feiya Xu, Yaping Wu, and Junyong Kang

Subjects
General Engineering, General Physics and Astronomy
Abstract

Memristors are excellent candidates for non-volatile memory and neuromorphic computing. Controlling the resistive switching polarity in certain materials holds great promise for the design and integration of multifunctional memristors. Here, bipolar and unipolar nonvolatility were realized by modulating the crystal structures, which exhibit high switching ratios, desirable cyclability, and long retention. By investigating the defect level and conductivity difference in single-crystal and polycrystal ReS2, the competition between electric field and Joule heat effects were revealed as the essential mechanism governing the switching process and memristive polarities. These results promote the design of two-dimensional memristors with controllable polarity.

Published
2023
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13. Effects of decision aids on breast reconstruction: A systematic review and meta-analysis of randomised controlled trials

Author

Shu Yang, Lin Yu, Chunmiao Zhang, Mengmeng Xu, Qi Tian, Xuan Cui, Yantong Liu, Shuanghan Yu, Minglu Cao, and Wei Zhang

Subjects
General Medicine, General Nursing
Abstract

To systematically evaluate the effects of decision aids for women facing breast reconstruction decision on decision conflict, decision regret, knowledge, satisfaction, anxiety and depression.Breast reconstruction decision is not good or bad and should be guided by clinical evidence and patient preferences. Decision aids can increase the patient's decision-making enthusiasm and ability, improve the quality of decision and promote shared decision-making between patients and medical staff.Systematic review and meta-analysis.Eight databases were conducted from the establishment of the database until October 2021. The PRISMA checklist was selected for analysis in this paper. The meta-analysis was conducted in Review Manager 5.3. The quality of the studies was assessed using the Cochrane risk-of-bias tool. The result is decision conflict, decision regret, knowledge and other secondary outcomes. Sensitivity analysis and subgroup analysis were also conducted.A total of twelve randomised controlled trials (RCTs) were included in the systematic review and meta-analysis. Meta-analysis revealed that decision aids could significantly reduce decision conflict and decision regret, improve knowledge, satisfaction and depression and had no influence on anxiety.The results of the systematic review and meta-analysis reviewed the positive effect of decision aids on the decision-making of women facing postmastectomy breast reconstruction. In the future, more well-designed RCTs are needed to confirm the effects of decision aids on the decision-making of breast reconstruction and nurses should be encouraged to take part in the development of decision aids in accordance with strict standards and apply them to breast cancer patients considering postmastectomy breast reconstruction.Our study provides evidence for the effectiveness of decision aids on breast reconstruction and points to the important role of healthcare providers in the use of decision aids and in facilitating shared decision-making.

Published
2022

16. TCAD study of high breakdown voltage AlGaN/GaN HEMTs with embedded passivation layer

Author

Jianfeng Wu, Conghui Xu, Yangtao Fan, Xingyi Liu, Zhibai Zhong, Jun Yin, Chunmiao Zhang, Jing Li, and Junyong Kang

Subjects
Acoustics and Ultrasonics, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

The breakdown characteristics of AlGaN/GaN high-electron-mobility transistors are one of the most important parameters for practical applications when used as power devices. In this study, the relationship between the relative permittivity of the passivation layers and the breakdown voltages in the off state was investigated in detail using TCAD simulations. An embedded double-passivation layer was proposed to enhance the breakdown voltage of the devices. This device structure was realized using an additional step of etching and opening holes on the edge of the gate metal, followed by the deposition of the embedded passivation films. The extracted electric field shows that this embedded passivation layer not only can improve the breakdown characteristics of the device like using a single high-k passivation film but also presents as the function of the ‘Metal Field Plate’, additionally resulting in the enlarged breakdown voltage. Further theoretical simulations indicated that the greater the difference between the dielectric constants of the high/low passivation materials, the higher the breakdown voltage can be obtained.

Published
2022
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17. Controllable growth of 2H-1 T′ MoS2/ReS2 heterostructures via chemical vapor deposition

Author

Zhiming Wu, Kai Chen, Junyong Kang, Xu Li, Jiahao Yao, Chunmiao Zhang, Qingming He, Haiyang Liu, and Yaping Wu

Subjects
Materials science, business.industry, Stacking, Shell (structure), General Physics and Astronomy, Heterojunction, Surfaces and Interfaces, General Chemistry, Chemical vapor deposition, Condensed Matter Physics, Epitaxy, Surfaces, Coatings and Films, Core (optical fiber), Phase (matter), Monolayer, Optoelectronics, business
Abstract

Two-dimensional (2D) 2H-1 T′ heterojunctions based on transition-metal dichalcogenides have attracted great attention due to their special interface structures and novel properties. Understanding the growth mechanism and the interface structures is essential for their controllable growth. In this work, we successfully synthesize lateral and vertical MoS2/ReS2 heterojunctions by using a two-step chemical vapor deposition (CVD) method, and deeply explore the evolution of the structure. It is found that the growth mode of heterojunction undergoes a transition from lateral epitaxy to vertical stacking under a high Re/S ratio during the growth. Furthermore, the interface structure is greatly determined by the edge shape of MoS2 core. Two kinds of structures, with the b-axis of 1 T′ ReS2 shell parallel to the (1 0 0) and (0 1 0) plane of MoS2 core respectively, are observed. Meanwhile, by comparing with MoS2 monolayer, MoS2/ReS2 heterostructures possess a reduced emission intensity due to the carrier transfer. This work provides a robust and controllable strategy for the synthesis of heterostructures with different phase structures.

Published
2022
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