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686 results on '"Lu, Zheng‐Hong"'

1. Diamine chelates for increased stability in mixed Sn–Pb and all-perovskite tandem solar cells

Author

Li, Chongwen, Chen, Lei, Jiang, Fangyuan, Song, Zhaoning, Wang, Xiaoming, Balvanz, Adam, Ugur, Esma, Liu, Yuan, Liu, Cheng, Maxwell, Aidan, Chen, Hao, Liu, Yanjiang, Wang, Zaiwei, Xia, Pan, Li, You, Fu, Sheng, Sun, Nannan, Grice, Corey R., Wu, Xuefei, Fink, Zachary, Hu, Qin, Zeng, Lewei, Jung, Euidae, Wang, Junke, Park, So Min, Luo, Deying, Chen, Cailing, Shen, Jie, Han, Yu, Perini, Carlo Andrea Riccardo, Correa-Baena, Juan-Pablo, Lu, Zheng-Hong, Russell, Thomas P., De Wolf, Stefaan, Kanatzidis, Mercouri G., Ginger, David S., Chen, Bin, Yan, Yanfa, and Sargent, Edward H.

Published
2024
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2. Coherent growth of high-Miller-index facets enhances perovskite solar cells

Author

Li, Shunde, Xiao, Yun, Su, Rui, Xu, Weidong, Luo, Deying, Huang, Pengru, Dai, Linjie, Chen, Peng, Caprioglio, Pietro, Elmestekawy, Karim A., Dubajic, Milos, Chosy, Cullen, Hu, Juntao, Habib, Irfan, Dasgupta, Akash, Guo, Dengyang, Boeije, Yorrick, Zelewski, Szymon J., Lu, Zhangyuchang, Huang, Tianyu, Li, Qiuyang, Wang, Jingmin, Yan, Haoming, Chen, Hao-Hsin, Li, Chunsheng, Lewis, Barnaby A. I., Wang, Dengke, Wu, Jiang, Zhao, Lichen, Han, Bing, Wang, Jianpu, Herz, Laura M., Durrant, James R., Novoselov, Kostya S., Lu, Zheng-Hong, Gong, Qihuang, Stranks, Samuel D., Snaith, Henry J., and Zhu, Rui

Published
2024
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3. Multifunctional ytterbium oxide buffer for perovskite solar cells

Author

Chen, Peng, Xiao, Yun, Hu, Juntao, Li, Shunde, Luo, Deying, Su, Rui, Caprioglio, Pietro, Kaienburg, Pascal, Jia, Xiaohan, Chen, Nan, Wu, Jingjing, Sui, Yanping, Tang, Pengyi, Yan, Haoming, Huang, Tianyu, Yu, Maotao, Li, Qiuyang, Zhao, Lichen, Hou, Cheng-Hung, You, Yun-Wen, Shyue, Jing-Jong, Wang, Dengke, Li, Xiaojun, Zhao, Qing, Gong, Qihuang, Lu, Zheng-Hong, Snaith, Henry J., and Zhu, Rui

Published
2024
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6. Suppressed phase segregation for triple-junction perovskite solar cells

Author

Wang, Zaiwei, Zeng, Lewei, Zhu, Tong, Chen, Hao, Chen, Bin, Kubicki, Dominik J., Balvanz, Adam, Li, Chongwen, Maxwell, Aidan, Ugur, Esma, dos Reis, Roberto, Cheng, Matthew, Yang, Guang, Subedi, Biwas, Luo, Deying, Hu, Juntao, Wang, Junke, Teale, Sam, Mahesh, Suhas, Wang, Sasa, Hu, Shuangyan, Jung, Eui Dae, Wei, Mingyang, Park, So Min, Grater, Luke, Aydin, Erkan, Song, Zhaoning, Podraza, Nikolas J., Lu, Zheng-Hong, Huang, Jinsong, Dravid, Vinayak P., De Wolf, Stefaan, Yan, Yanfa, Grätzel, Michael, Kanatzidis, Merx G., and Sargent, Edward H.

Published
2023
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7. Stabilization of 3D/2D perovskite heterostructures via inhibition of ion diffusion by cross-linked polymers for solar cells with improved performance

Author

Luo, Long, Zeng, Haipeng, Wang, Zaiwei, Li, Min, You, Shuai, Chen, Bin, Maxwell, Aidan, An, Qinyou, Cui, Lianmeng, Luo, Deying, Hu, Juntao, Li, Shangzhi, Cai, Xueqing, Li, Weixi, Li, Lin, Guo, Rui, Huang, Rong, Liang, Wenxi, Lu, Zheng-Hong, Mai, Liqiang, Rong, Yaoguang, Sargent, Edward H., and Li, Xiong

Published
2023
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8. Low‐Dimensional Contact Layers for Enhanced Perovskite Photodiodes

Author

Luo, Deying, Zou, Taoyu, Yang, Wengqiang, Xiang, Beng, Yang, Xiaoyu, Wang, Ya, Su, Rui, Zhao, Lichen, Zhu, Rui, Zhou, Hang, Russell, Thomas P, Yu, Hongyu, and Lu, Zheng‐Hong

Subjects
Affordable and Clean Energy, carrier lifetime, electric fields, microstrains, perovskite photodiodes, Physical Sciences, Chemical Sciences, Engineering, Materials
Abstract

Controlling defects and energy-band alignments are of paramount importance to the development of high-performance perovskite-based photodiodes. Yet, concurrent improvements in interfacial contacts and defect reduction simply by tailoring bottom contacts have not been investigated. An effective strategy is reported that can simultaneously improve energy-band alignments and structural defects by introducing low-dimensional contact (LDC) layers at the bottom interface. It is found that LDC-based perovskites considerably suppress undesirable structural defects induced by microstrains, resulting in reduced nonradiative recombination centers and improved carrier lifetimes. Additionally, the resulting LDC-based interface structures help block minority carrier injection from the electrodes by forming built-in electric fields. As a consequence, LDC-based perovskite photodiodes showed improved light detection capabilities. The result opens an avenue to yield highly efficient photodiodes.

Published
2020

14. Ion migration in p-type perovskite MAPbI3 films under an electric field and thin-film transistor device failure.

Author

Su, Jiale, Yang, Zhenxin, Li, Xuanhe, Li, Fushun, Hu, Juntao, Chen, Nan, Zhang, Tao, Wang, Dengke, Lu, Zheng-Hong, and Zhu, Qiang

Subjects
ION migration & velocity, ELECTRIC fields, ION analysis, TRANSISTORS, ADDITIVES
Abstract

This study demonstrated a dynamic analysis to investigate the ion migration in p-type perovskite MAPbI3 films under an electric field, revealing its detrimental effects on the electrical performance of MAPbI3-based devices. An additive strategy was proposed to suppress ion migration, thereby facilitating the fabrication of high-performance MAPbI3-based devices. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Investigating energy level alignments at organic–organic interfaces in practical devices.

Author

Wang, You-Mei, Wang, Deng-Ke, Peng, Meng-Ran, Wang, Jian-Qing, Shi, Chang-Sheng, Ding, Jun-Qiao, Leng, Mei, Zhao, Yong-Biao, and Lu, Zheng-Hong

Subjects
ENERGY levels (Quantum mechanics), ELECTROLUMINESCENT devices, SEMICONDUCTOR devices, SEMICONDUCTOR design, MOLECULES
Abstract

Energy level alignments are crucial for designing high-performance semiconductor devices. However, the reported energy levels, especially the lowest unoccupied energy levels (LUMOs), exhibit significant variability for a given molecular compound. This variability often leads to misunderstanding of device working mechanisms. In this study, single-carrier devices with organic/interlayer/organic structures are proposed to probe the energy level alignments at organic–organic heterojunctions. It is observed that carrier transport characteristics deviate significantly depending on charge scattering or trapping. Five organic molecules, including 1, 3, 5-tri(m-pyrid-3-ylphenyl)benzene (TmPyPB), 4, 4′-bis(arbazole-9-y1)biphenyl (CBP), 2, 2′, 2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi), bis[2-(2-hydroxyphenyl)-pyridine] beryllium (Bepp2), and tris(8-hydroxyquinolinato)aluminum (Alq3), are utilized to test the method. The deduced LUMO level order for these materials is found to deviate significantly from reported values. Furthermore, the effect of differences in the energy level arrangement on the performance of electroluminescent devices is investigated. This work suggests that determining LUMO energy alignments via single-carrier analysis is a valuable method for understanding device working mechanisms. [ABSTRACT FROM AUTHOR]

Published
2024
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22. In situ cell-scale probing nucleation, growth and evolution of CsPbBr3 nanowires by optical absorption spectroscopy.

Author

Bai, Yan, Wu, Heqian, Wang, Dengke, Liu, Mei, Lu, Zheng-Hong, and Ding, Huaiyi

Subjects
OPTICAL spectroscopy, NANOWIRES, LIGHT absorption, NUCLEATION, POTENTIAL well
Abstract

The growth kinetics of colloidal lead halide perovskite nanomaterials are an integral part of their applications, remains poorly understood due to complex nucleation processes and lack of in situ size monitoring method. Here we demonstrated that absorption spectra can be used to observe in situ growth processes of ultrathin CsPbBr3 nanowires in solution with reference to the effective mass infinite deep square potential well model. By means of this method, we have found that the ultrathin nanowires, fabricated by hot injection method, were firstly formed within one minute. Subsequently, they merge with each other into a thicker structure with increasing reaction time. We revealed that the nucleation, growth, and merging of the CsPbBr3 nanowires are determined by the acid concentration and ligand chain length. At lower acidity, the critical nucleation size of the nanowire is smaller, while the shorter the ligand chain length, the faster the merging among the nanowires. Moreover, the merging mode between nanowires changed with their nucleation size. This growth kinetics of CsPbBr3 nanowires provides a reference for optimizing the synthesis conditions to obtain the one-dimensional CsPbBr3 with desired size, thus enabling accurate control of the nanowire shape. [ABSTRACT FROM AUTHOR]

Published
2024
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26. Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

Author

Dong, Yitong, Wang, Ya-Kun, Yuan, Fanglong, Johnston, Andrew, Liu, Yuan, Ma, Dongxin, Choi, Min-Jae, Chen, Bin, Chekini, Mahshid, Baek, Se-Woong, Sagar, Laxmi Kishore, Fan, James, Hou, Yi, Wu, Mingjian, Lee, Seungjin, Sun, Bin, Hoogland, Sjoerd, Quintero-Bermudez, Rafael, Ebe, Hinako, Todorovic, Petar, Dinic, Filip, Li, Peicheng, Kung, Hao Ting, Saidaminov, Makhsud I., Kumacheva, Eugenia, Spiecker, Erdmann, Liao, Liang-Sheng, Voznyy, Oleksandr, Lu, Zheng-Hong, and Sargent, Edward H.

Published
2020
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28. Managing grains and interfaces via ligand anchoring enables 22.3%-efficiency inverted perovskite solar cells

Author

Zheng, Xiaopeng, Hou, Yi, Bao, Chunxiong, Yin, Jun, Yuan, Fanglong, Huang, Ziru, Song, Kepeng, Liu, Jiakai, Troughton, Joel, Gasparini, Nicola, Zhou, Chun, Lin, Yuanbao, Xue, Ding-Jiang, Chen, Bin, Johnston, Andrew K., Wei, Nini, Hedhili, Mohamed Nejib, Wei, Mingyang, Alsalloum, Abdullah Y., Maity, Partha, Turedi, Bekir, Yang, Chen, Baran, Derya, Anthopoulos, Thomas D., Han, Yu, Lu, Zheng-Hong, Mohammed, Omar F., Gao, Feng, Sargent, Edward H., and Bakr, Osman M.

Published
2020
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30. Interfacial structure in organic optoelectronics

Author

Turak, Ayse, Grozea, Dan, Huang, Chanjun, and Lu, Zheng-Hong

Subjects
Condensed Matter - Materials Science
Abstract

The interfacial structure plays a critical role in modern optoelectronics. Currently multilayer electrodes are used to optimize the injection and lifetime properties. The choice of interlayer is not universal, with different effects for the same material with different capping metals. Using a novel in-situ characterization method with X-ray photoelectron spectroscopy, the organic/inorganic interface in OLEDs was examined for two common cathode metals with a LiF interlayer. The impact of the interfacial layer on the performance of devices can be attributed to the bulk lattice matching of the interfacial layer and of the by-products of interfacial oxidation, and the metallic cathode., Comment: 2 pages, proceedings of the 4th UT2 Graduate Student Workshop (University of Tokyo - University of Toronto), 2005

Published
2012

33. Buried‐Metal‐Grid Electrodes for Efficient Parallel‐Connected Perovskite Solar Cells

Author

Li, Lei, primary, Chen, Peng, additional, Su, Rui, additional, Xu, Hongyu, additional, Li, Qiuyang, additional, Zhong, Qixuan, additional, Yan, Haoming, additional, Yang, Xiaoyu, additional, Hu, Juntao, additional, Li, Shunde, additional, Huang, Tianyu, additional, Xiao, Yun, additional, Liu, Bin, additional, Ji, Yongqiang, additional, Wang, Dengke, additional, Sun, Huiliang, additional, Guo, Xugang, additional, Lu, Zheng‐Hong, additional, Snaith, Henry J., additional, Gong, Qihuang, additional, Zhao, Lichen, additional, and Zhu, Rui, additional

Published
2023
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36. Self-assembled monolayer–based blue perovskite LEDs

Author

Wang, Ya-Kun, primary, Jia, Fengyan, additional, Li, Xiaoyue, additional, Teale, Sam, additional, Xia, Pan, additional, Liu, Yuan, additional, Chan, Phoebe Tsz-shan, additional, Wan, Haoyue, additional, Hassan, Yasser, additional, Imran, Muhammad, additional, Chen, Hao, additional, Grater, Luke, additional, Sun, Ling-Dong, additional, Walker, Gilbert C., additional, Hoogland, Sjoerd, additional, Lu, Zheng-Hong, additional, Yan, Chun-Hua, additional, Liao, Liang-Sheng, additional, and Sargent, Edward H., additional

Published
2023
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37. Core-level spectroscopy of Si/SiO_2 quantum wells: evidence for confined states

Author

Carrier, Pierre, Lu, Zheng-Hong, Dharma-wardana, M. W. Chandre, and Lewis, Laurent J.

Subjects
Condensed Matter - Materials Science
Abstract

We present an experimental and theoretical study of the conduction states of crystalline Si films confined within amorphous SiO_2 barriers, using the Si-2p core-level excitations. The spectral peaks near the conduction band minimum are compared with the bulk silicon spectrum. In the Si quantum wells, it is found that the conduction band minimum and the low-lying peaks undergo a blue shift while all higher peaks remain unshifted. The experimental results are supported by calculations using recent first-principles structural models for Si/SiO_2 superlattices. The experimental results suggest that all conduction states up to a given conduction band offset become confined and blue-shifted while those at higher energies are not confined and undergo no shift. These results provide unambiguous evidence that the visible-light emitting properties of Si/SiO_2 structures depend strongly on electron confinement effects., Comment: 4 pages, 4 figures, submitted to Physical Review Letter (August 27, 2002)

Published
2002

43. Edge stabilization in reduced-dimensional perovskites

Author

Na Quan, Li, Ma, Dongxin, Zhao, Yongbiao, Voznyy, Oleksandr, Yuan, Haifeng, Bladt, Eva, Pan, Jun, García de Arquer, F. Pelayo, Sabatini, Randy, Piontkowski, Zachary, Emwas, Abdul-Hamid, Todorović, Petar, Quintero-Bermudez, Rafael, Walters, Grant, Fan, James Z., Liu, Mengxia, Tan, Hairen, Saidaminov, Makhsud I., Gao, Liang, Li, Yiying, Anjum, Dalaver H., Wei, Nini, Tang, Jiang, McCamant, David W., Roeffaers, Maarten B. J., Bals, Sara, Hofkens, Johan, Bakr, Osman M., Lu, Zheng-Hong, and Sargent, Edward H.

Published
2020
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45. Sequentially N‐Doped Acceptor Primer Layer Facilitates Electron Collection of Inverted Non‐Fullerene Organic Solar Cells.

Author

Xie, Jiaqi, Lin, Weihua, Wang, Dengke, Lu, Zheng‐Hong, Zheng, Kaibo, and Liang, Ziqi

Subjects
SOLAR cells, DOPING agents (Chemistry), ELECTRON transport, FULLERENE polymers, ELECTRON density, ELECTRONS, ELECTROPHILES, ELECTRON donors, FULLERENES
Abstract

In most non‐fullerene organic solar cells comprising bulk‐heterojunction active layers, the inter‐domain connectivity of small‐molecule acceptors is generally inferior to those of polymeric donors due to their intrinsic short‐range ordering. This issue is even exacerbated by the physiochemical mismatch between acceptor‐phases and metal‐oxide electron transport layers in most inverted n‐i‐p devices, leading to inefficient electron collection. By pre‐depositing an ultra‐thin acceptor primer layer, it develops a novel acceptor‐enriched‐bottom active layer to reinforce the acceptor‐phase continuity. It is however challenging to preserve the primer layer during non‐orthogonal solvent processing. Thus, sequential n‐type doping is implemented on the surface of the primer layer, which allows to slightly reduce the acceptor solubility by polarity regulation, as well as stabilize the film structure via strong π–π interaction between dopant/host acceptor. Upon acceptor enrichment, higher interfacial electron density enhances the built‐in potential while the enlarged domains suppress both charge‐transfer state and bimolecular recombination. Consequently, the champion device efficiency is greatly improved from ca. 16.1% to 18.0%, mainly resulting from the simultaneously elevated fill factor and short‐circuit current density. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Bifunctional Electron-Transporting Agent for Red Colloidal Quantum Dot Light-Emitting Diodes

Author

Wang, Ya-Kun, primary, Wan, Haoyue, additional, Xu, Jian, additional, Zhong, Yun, additional, Jung, Eui Dae, additional, Park, So Min, additional, Teale, Sam, additional, Imran, Muhammad, additional, Yu, You-Jun, additional, Xia, Pan, additional, Won, Yu-Ho, additional, Kim, Kwang-Hee, additional, Lu, Zheng-Hong, additional, Liao, Liang-Sheng, additional, Hoogland, Sjoerd, additional, and Sargent, Edward H., additional

Published
2023
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50. Mechanistic studies of Yb2O3/HAT-CN connection electrode in tandem semiconductor devices.

Author

Chen, Nan, Man, Jiaxiu, Shi, Changsheng, Hu, Juntao, Wang, Dengke, and Lu, Zheng-Hong

Subjects
ELECTRON energy loss spectroscopy, ORGANIC light emitting diodes, SEMICONDUCTOR manufacturing, ELECTRON energy states, PHOTOELECTRON spectroscopy, ELECTRODES, SEMICONDUCTOR devices, ORGANIC semiconductors
Abstract

The optically transparent connecting electrode is much desired in fabrication of tandem optoelectronic devices. Yet, optically transparent materials, such as oxides, are electrically insulating. In this work, we show that low work function oxides Yb2O3 combing with high work function 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) molecule can be used as effective connecting electrodes to make high performance tandem organic light emitting diodes with negligible voltage loss. For instance, in a tandem device with two emission zones, yielding a brightness of 100 cd/m2, the voltage required is 5.3 V, which is approximately twice that of a single emission zone device. To gain insights into the band alignment of this electrode, we conducted the measurements, including ultraviolet photoelectron spectroscopy to analyze the electronic structures of occupied valence and gap states and reflection electron energy loss spectroscopy to study the unoccupied states. To understand the charge transport and injection behavior of this electrode, we conducted variable temperature charge transport measurements. Our findings reveal the presence of localized gap states within the Yb2O3/HAT-CN structure. These gap states effectively form a conduction pathway for facilitating the transport of charge carriers. At higher temperatures (≥200 K), charge transport is primarily limited by the Efros–Shklovskii type of hopping conduction through the localized states in the Yb2O3. Conversely, at lower temperatures (<200 K), the electrical current is limited by the properties of HAT-CN. These discoveries suggest that localized gap states at the oxides/organic heterojunctions can be effectively utilized in the fabrication of tandem semiconductor devices. [ABSTRACT FROM AUTHOR]

Published
2023
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