Thickness effects of ZnO thin film on the performance of tri-iodide perovskite absorber based photovoltaics

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題名:	Thickness effects of ZnO thin film on the performance of tri-iodide perovskite absorber based photovoltaics
作者:	張勝雄;Lee, Kun-Mu;Chang, Sheng Hsiung;Wang, Kai-Hung;Chang, Chun-Ming;Cheng, Hsin-Ming;Kei, Chi-Chung;Tseng, Zong-Liang;Wu, Chun-Guey
貢獻者:	理學院光電科學與工程學系
關鍵詞:	Absorption;Conductivity;Electric currents;Electrons;Energy transfer;Iodides;Perovskite;Photo-induced absorption;Photovoltaic;Photovoltaic cells;Photovoltaics;Thin films;Time-resolved photoluminescence
日期:	2015-10-01
上傳時間:	2026-04-23 11:48:36 (UTC+8)
出版者:	Elsevier Ltd.;New York: Elsevier Ltd
摘要:	摘要： •Exciton dissociation at the interface between perovskite and ZnO was investigated.•The optimized ZnO film results in a better exciton dissociation.•The use of 30-nm thick ZnO film enhances the performance of perovskite photovoltaic. Comprehensive studies were carried out to understand the thickness effects of ZnO thin films for tri-iodide perovskite absorber (TPA) based photovoltaics, including the absorption spectrum, photoluminescence, nanosecond time-resolved photoluminescence (NTRPL), and photo-induced absorption (PIA) of TPA/ZnO/ITO/glass. These were carried out in order to explore the Urbach energy of TPA films and the exciton dissociation at the interface between TPA and ZnO. The results show that the thickness of the ZnO thin film significantly influences the photovoltaic performance in terms of open-circuit voltage (VOC), fill factor (FF), and short-circuit current density (JSC). In the case of the thicker ZnO film, the photovoltaics have the better FF and Voc, as a result of the smaller electron recombination. This means that a thicker ZnO film can block the electron recombination from the Fermi level of the ITO to the valance band of the TPA. On the other hand, the thicker ZnO film results in a higher JSC due to the better exciton dissociation at the interface between TPA and ZnO, which means that the electron mobility of the thicker ZnO is higher. Consequently, the photovoltaic performance can be expected to be improved by using a transparent cathode electrode with high conductivity and electron mobility. 出版者： New York: Elsevier Ltd 出版日期： 2015-10-01 出處： Solar energy, 2015-10, Vol.120, p.117-122 版權： 2015 Elsevier Ltd 版權： Copyright Pergamon Press Inc. Oct 2015 識別號： ISSN: 0038-092X 識別號： EISSN: 1471-1257 識別號： DOI: 10.1016/j.solener.2015.07.030 識別號： CODEN: SRENA4
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