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25 results on '"Sahamir, Shahrir Razey"'

3. Restraining Photocurrent Loss of Lead-Free Perovskite Solar Cells by Regulating Surficial Hydroxyl of Fluorine-Doped Tin Oxide

Author

Liu, Jiaqi, primary, Bi, Huan, additional, Zhang, Zheng, additional, Fujiwara, Yasuhiro, additional, Sanehira, Yoshitaka, additional, Kapil, Gaurav, additional, Kitamura, Takeshi, additional, Sahamir, Shahrir Razey, additional, Baranwal, Ajay Kumar, additional, Wang, Liang, additional, Shen, Qing, additional, and Hayase, Shuzi, additional

Published
2024
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5. Double side passivation of phenylethyl ammonium iodide for all perovskite tandem solar cell with efficiency of 26.8%

Author

Bi, Huan, Liu, Jiaqi, Wang, Liang, Zhang, Zheng, Kapil, Gaurav, Sahamir, Shahrir Razey, Baranwal, Ajay Kumar, Wei, Yuyao, Yang, Yongge, Wang, Dandan, Kitamura, Takeshi, Segawa, Hiroshi, Shen, Qing, and Hayase, Shuzi

Abstract

All‐perovskite tandem solar cells are regarded as the next generation of devices capable of enhancing the solar energy utilization rate. Unlike single‐junction perovskite solar cells (PSCs), the efficacy of tandem cells is contingent upon the performance of both the top and bottom cells. In this study, we employed a simultaneous co‐modification strategy to incorporate phenylethylammonium iodide (PEAI) at both the top and bottom interfaces of the perovskite film, aiming to boost the top cell's performance. Both experimental and theoretical findings indicate that PEAI not only elevates the perovskite film quality through chemical interactions but also mitigates nonradiative recombination within the device. Consequently, the efficiency of the wide‐bandgap (1.77 eV) PSCs based on nickel oxide (NiOx) attained a level of 16.5%. Simultaneously, the all‐perovskite tandem solar cells achieved an efficiency of 26.81% and demonstrated superior stability. Phenylethylammonium iodide was used to collaboratively passivate the upper and lower interfaces of the perovskite film. Quantitative calculations revealed the reasons for the improvement inpower conversion efficiency.Density functional theory calculations were also used to prove the underlying reasons for this improvement.

Published
2024
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6. Efficiency Enhancement of Wide Bandgap Lead Perovskite Solar Cells with PTAA Surface-Passivated with Monomolecular Layer from the Viewpoint of PTAA Band Bending

Author

Bi, Huan, primary, Liu, Jiaqi, additional, Beresneviciute, Raminta, additional, Tavgeniene, Daiva, additional, Zhang, Zheng, additional, Wang, Liang, additional, Kapil, Gaurav, additional, Ding, Chao, additional, Sahamir, Shahrir Razey, additional, Sanehira, Yoshitaka, additional, Baranwal, Ajay Kumar, additional, Kitamura, Takeshi, additional, Wang, Dandan, additional, Wei, Yuyao, additional, Yang, Yongge, additional, Kang, Dong-Won, additional, Grigalevicius, Saulius, additional, Shen, Qing, additional, and Hayase, Shuzi, additional

Published
2023
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8. Perovskite Solar Cells Consisting of PTAA Modified with Monomolecular Layer and Application to All‐Perovskite Tandem Solar Cells with Efficiency over 25%

Author

Bi, Huan, primary, Fujiwara, Yasuhiro, additional, Kapil, Gaurav, additional, Tavgeniene, Daiva, additional, Zhang, Zheng, additional, Wang, Liang, additional, Ding, Chao, additional, Sahamir, Shahrir Razey, additional, Baranwal, Ajay Kumar, additional, Sanehira, Yoshitaka, additional, Takeshi, Kitamura, additional, Shi, Guozheng, additional, Bessho, Takeru, additional, Segawa, Hiroshi, additional, Grigalevicius, Saulius, additional, Shen, Qing, additional, and Hayase, Shuzi, additional

Published
2023
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9. Pb-free perovskite solar cells composed of Sn/Ge(1:1) alloyed perovskite layer prepared by spin-coating

Author

Bi, Huan, primary, Chen, Mengmeng, additional, Wang, Liang, additional, Zhang, Zheng, additional, Ding, Chao, additional, Kapil, Gaurav, additional, Sahamir, Shahrir Razey, additional, Sanehira, Yoshitaka, additional, Baranwal, Ajay Kumar, additional, Kitamura, Takeshi, additional, Shi, Guozheng, additional, Shen, Qing, additional, and Hayase, Shuzi, additional

Published
2023
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13. Unveiling the Role of the Metal Oxide/Sn Perovskite Interface Leading to Low Efficiency of Sn-Perovskite Solar Cells but Providing High Thermoelectric Properties

Author

Baranwal, Ajay Kumar, primary, Saini, Shrikant, additional, Sanehira, Yoshitaka, additional, Kapil, Gaurav, additional, Kamarudin, Muhammad Akmal, additional, Ding, Chao, additional, Sahamir, Shahrir Razey, additional, Yabuki, Tomohide, additional, Iikubo, Satoshi, additional, Shen, Qing, additional, Miyazaki, Koji, additional, and Hayase, Shuzi, additional

Published
2022
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16. Large synergy effects of doping, a site substitution, and surface passivation in wide bandgap Pb-free ASnI2Br perovskite solar cells on efficiency and stability enhancement

Author

Chen, Mengmeng, primary, Kapil, Gaurav, additional, Li, Yusheng, additional, Kamarudin, Muhammad Akmal, additional, Baranwal, Ajay K., additional, Nishimura, Kohei, additional, Sahamir, Shahrir Razey, additional, Sanehira, Yoshitaka, additional, Li, Hua, additional, Ding, Chao, additional, Zhang, Zheng, additional, Shen, Qing, additional, and Hayase, Shuzi, additional

Published
2022
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17. High-Efficiency Lead-Free Wide Band Gap Perovskite Solar Cells via Guanidinium Bromide Incorporation

Author

Chen, Mengmeng, primary, Kamarudin, Muhammad Akmal, additional, Baranwal, Ajay K., additional, Kapil, Gaurav, additional, Ripolles, Teresa S., additional, Nishimura, Kohei, additional, Hirotani, Daisuke, additional, Sahamir, Shahrir Razey, additional, Zhang, Zheng, additional, Ding, Chao, additional, Sanehira, Yoshitaka, additional, Bisquert, Juan, additional, Shen, Qing, additional, and Hayase, Shuzi, additional

Published
2021
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18. Surface structure of quasi-2D perovskite PEA2mMAn−2mPbnI3n (n >> m)

Author

MIRZEHMET, Abduheber, OHTSUKA, Tomoki, ABD. RAHMAN, Syed A., AIHARA, Takumi, KAMARUDIN, Muhammad Akmal, SAHAMIR, Shahrir Razey, HAYASE, Shuzi, YUYAMA, Tomoki, KRÜGER, Peter, YOSHIDA, Hiroyuki, MIRZEHMET, Abduheber, OHTSUKA, Tomoki, ABD. RAHMAN, Syed A., AIHARA, Takumi, KAMARUDIN, Muhammad Akmal, SAHAMIR, Shahrir Razey, HAYASE, Shuzi, YUYAMA, Tomoki, KRÜGER, Peter, and YOSHIDA, Hiroyuki

Abstract

type:text, [ABSTRACT] Quasi-2D perovskites passivate the perovskite surface and improve the lifetime of perovskite solar cells. However, their detailed surface structures have never been reported. We studied the surfaces of the solution-processed quasi-2D PEA2mMAn−2mPbnI3n (PEA: C6H5CH3CH2NH3, MA: CH3NH3) perovskites as well as the 2D perovskite formed on top of 3D MAPbI3 with the thicknesses relevant to practical solar cell (n ≈ 400) using ultraviolet photoelectron and metastable-atom electron spectroscopies. We confirmed that PEA segregates to the surface and that the phenyl group (C6H5) covers the outermost surface of the quasi-2D perovskite. We discuss plausible structures from the concentration dependence of PEA.

Published
2021

19. Surface structure of quasi-2D perovskite PEA2mMAn−2mPbnI3n(n ≫ m)

Author

Mirzehmet, Abduheber, primary, Ohtsuka, Tomoki, additional, Rahman, Syed A. Abd., additional, Aihara, Takumi, additional, Kamarudin, Muhammad Akmal, additional, Sahamir, Shahrir Razey, additional, Hayase, Shuzi, additional, Yuyama, Tomoki, additional, Krüger, Peter, additional, and Yoshida, Hiroyuki, additional

Published
2021
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20. Surface structure of quasi-2D perovskite PEA2mMAn−2mPbnI3n (n ≫ m).

Author

Mirzehmet, Abduheber, Ohtsuka, Tomoki, Rahman, Syed A. Abd., Aihara, Takumi, Kamarudin, Muhammad Akmal, Sahamir, Shahrir Razey, Hayase, Shuzi, Yuyama, Tomoki, Krüger, Peter, and Yoshida, Hiroyuki

Abstract

Quasi-2D perovskites passivate the perovskite surface and improve the lifetime of perovskite solar cells. However, their detailed surface structures have never been reported. We studied the surfaces of the solution-processed quasi-2D PEA2mMAn−2mPbnI3n (PEA: C6H5CH3CH2NH3, MA: CH3NH3) perovskites as well as the 2D perovskite formed on top of 3D MAPbI3 with the thicknesses relevant to practical solar cell (n ≈ 400) using ultraviolet photoelectron and metastable-atom electron spectroscopies. We confirmed that PEA segregates to the surface and that the phenyl group (C6H5) covers the outermost surface of the quasi-2D perovskite. We discuss plausible structures from the concentration dependence of PEA. [ABSTRACT FROM AUTHOR]

Published
2021
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23. Studies on relation between columnar order and electrical conductivity in HAT6 discotic liquid crystals using temperature-dependent Raman spectroscopy and DFT calculations.

Author

Sahamir, Shahrir Razey, Said, Suhana Mohd, Mohd Sabri, Mohd Faizul, Mahmood, Mohamand Syafie, Bin Kamarudin, Muhammad Akmal, and Moutanabbir, Oussama

Subjects
*DISCOTIC liquid crystals, *LIQUID crystals, *RAMAN spectroscopy, *RAMAN spectra, *OPTICAL properties of condensed matter
Abstract

The vibrational property of 2,3,6,7,10,11-hexakis(hexyloxy)triphenylene (HAT6) discotic liquid crystal (DLC) material is investigated in this research by using temperature-dependent Raman spectroscopy technique. One-dimensional (1D) charge transport mechanism in the DLC molecules is enabled in the columnar liquid crystalline (Dh) phase. The result indicates a high core-to-core correlation in the liquid crystal columnar phase, which has a ‘memory’ like effect that extends into isotropic phase at femtosecond timescale. This correlation is also confirmed through electrical conductivity measurement of DLCs, in which the electrical conductivity is enhanced in the DLC phase. DFT simulation was also carried out in order to elucidate the basic properties of HAT6 such as the band gap in the light of Raman spectra. An interesting outcome is that a freely unspecified boundary model produces in a more flexible molecule,  resulting in a reduced band gap. Thus, this work provides an understanding of relationship between columnar order and electrical conductivity of HAT6 molecule, and potential strategy for design of DLCs in electronics application. [ABSTRACT FROM AUTHOR]

Published
2018
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24. A Review on the Fabrication of Polymer-Based Thermoelectric Materials and Fabrication Methods

Author

Kamarudin, Muhammad Akmal, Sahamir, Shahrir Razey, Datta, Robi Shankar, Long, Bui Duc, Mohd Sabri, Mohd Faizul, and Mohd Said, Suhana

Subjects
Article Subject
Abstract

Thermoelectricity, by converting heat energy directly into useable electricity, offers a promising technology to convert heat from solar energy and to recover waste heat from industrial sectors and automobile exhausts. In recent years, most of the efforts have been done on improving the thermoelectric efficiency using different approaches, that is, nanostructuring, doping, molecular rattling, and nanocomposite formation. The applications of thermoelectric polymers at low temperatures, especially conducting polymers, have shown various advantages such as easy and low cost of fabrication, light weight, and flexibility. In this review, we will focus on exploring new types of polymers and the effects of different structures, concentrations, and molecular weight on thermoelectric properties. Various strategies to improve the performance of thermoelectric materials will be discussed. In addition, a discussion on the fabrication of thermoelectric devices, especially suited to polymers, will also be given. Finally, we provide the challenge and the future of thermoelectric polymers, especially thermoelectric hybrid model.

Published
2013
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25. Surface structure of quasi-2D perovskite PEA2mMAn?2mPbnI3n(n? m)

Author

Mirzehmet, Abduheber, Ohtsuka, Tomoki, Rahman, Syed A. Abd., Aihara, Takumi, Kamarudin, Muhammad Akmal, Sahamir, Shahrir Razey, Hayase, Shuzi, Yuyama, Tomoki, Krüger, Peter, and Yoshida, Hiroyuki

Abstract

Quasi-2D perovskites passivate the perovskite surface and improve the lifetime of perovskite solar cells. However, their detailed surface structures have never been reported. We studied the surfaces of the solution-processed quasi-2D PEA2mMAn?2mPbnI3n(PEA: C6H5CH3CH2NH3, MA: CH3NH3) perovskites as well as the 2D perovskite formed on top of 3D MAPbI3with the thicknesses relevant to practical solar cell (n? 400) using ultraviolet photoelectron and metastable-atom electron spectroscopies. We confirmed that PEA segregates to the surface and that the phenyl group (C6H5) covers the outermost surface of the quasi-2D perovskite. We discuss plausible structures from the concentration dependence of PEA.

Published
2021
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