Browsing by Author "Zhong, Yufei"
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- ItemRoadmap on commercialization of metal halide perovskite photovoltaics(Bristol : IOP Publishing, 2023) Feng, Shien-Ping; Cheng, Yuanhang; Yip, Hin-Lap; Zhong, Yufei; Fong, Patrick W. K.; Li, Gang; Ng, Annie; Chen, Cong; Castriotta, Luigi Angelo; Matteocci, Fabio; Vesce, Luigi; Saranin, Danila; Carlo, Aldo Di; Wang, Puqun; Wei Ho, Jian; Hou, Yi; Lin, Fen; Aberle, Armin G; Song, Zhaoning; Yan, Yanfa; Chen, Xu; Yang, Yang (Michael); Syed, Ali Asgher; Ahmad, Ishaq; Leung, Tiklun; Wang, Yantao; Lin, JingYang; Ng, Alan Man Ching; Li, Yin; Ebadi, Firouzeh; Tress, Wolfgang; Richardson, Giles; Ge, Chuangye; Hu, Hanlin; Karimipour, Masoud; Baumann, Fanny; Tabah, Kenedy; Pereyra, Carlos; Raga, Sonia R.; Xie, Haibing; Lira-Cantu, Monica; Khenkin, Mark V.; Visoly-Fisher, Iris; Katz, Eugene A.; Vaynzof, Yana; Vidal, Rosario; Yu, Guicheng; Lin, Haoran; Weng, Shuchen; Wang, Shifeng; Djurišić, Aleksandra B.Perovskite solar cells (PSCs) represent one of the most promising emerging photovoltaic technologies due to their high power conversion efficiency. However, despite the huge progress made not only in terms of the efficiency achieved, but also fundamental understanding of the relevant physics of the devices and issues which affect their efficiency and stability, there are still unresolved problems and obstacles on the path toward commercialization of this promising technology. In this roadmap, we aim to provide a concise and up to date summary of outstanding issues and challenges, and the progress made toward addressing these issues. While the format of this article is not meant to be a comprehensive review of the topic, it provides a collection of the viewpoints of the experts in the field, which covers a broad range of topics related to PSC commercialization, including those relevant for manufacturing (scaling up, different types of devices), operation and stability (various factors), and environmental issues (in particular the use of lead). We hope that the article will provide a useful resource for researchers in the field and that it will facilitate discussions and move forward toward addressing the outstanding challenges in this fast-developing field.
- ItemShort Excited-State Lifetimes Mediate Charge-Recombination Losses in Organic Solar Cell Blends with Low Charge-Transfer Driving Force(Weinheim : Wiley-VCH, 2021) Shivhare, Rishi; Moore, Gareth John; Hofacker, Andreas; Hutsch, Sebastian; Zhong, Yufei; Hambsch, Mike; Erdmann, Tim; Kiriy, Anton; Mannsfeld, Stefan C.B.; Ortmann, Frank; Banerji, NatalieA blend of a low-optical-gap diketopyrrolopyrrole polymer and a fullerene derivative, with near-zero driving force for electron transfer, is investigated. Using femtosecond transient absorption and electroabsorption spectroscopy, the charge transfer (CT) and recombination dynamics as well as the early-time transport are quantified. Electron transfer is ultrafast, consistent with a Marcus-Levich-Jortner description. However, significant charge recombination and unusually short excited (S1 ) and CT state lifetimes (≈14 ps) are observed. At low S1 -CT offset, a short S1 lifetime mediates charge recombination because: i) back-transfer from the CT to the S1 state followed by S1 recombination occurs and ii) additional S1 -CT hybridization decreases the CT lifetime. Both effects are confirmed by density functional theory calculations. In addition, relatively slow (tens of picoseconds) dissociation of charges from the CT state is observed, due to low local charge mobility. Simulations using a four-state kinetic model entailing the effects of energetic disorder reveal that the free charge yield can be increased from the observed 12% to 60% by increasing the S1 and CT lifetimes to 150 ps. Alternatively, decreasing the interfacial CT state disorder while increasing bulk disorder of free charges enhances the yield to 65% in spite of the short lifetimes.