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Yin, Chengrong; Lu, Jianfeng; Xu, Yachao; Yun, Yikai; Wang, Kai; Li, Jiewei; Jiang, Liangcong; Sun, Jingsong; Scully, Andrew D.; Huang, Fuzhi; Zhong, Jie; Wang, Jianpu; Cheng, Yi‐Bing; Qin, Tianshi; Huang, Wei
Advanced energy materials, July 25, 2018, Letnik: 8, Številka: 21Journal Article
Despite the recent unprecedented development of efficient dopant‐free hole transporting materials (HTMs) for high‐performance perovskite solar cells (PSCs) on small‐area devices (≤0.1 cm2), low‐cost dopant‐free HTMs for large‐area PSCs (≥1 cm2) with high power conversion efficiencies (PCEs) have rarely been reported. Herein, two novel HTMs, 3,3′,6,6′ (or 2,2′,7,7′)‐tetrakis(N,N′‐di‐p‐methoxyphenylamine)‐N,N′‐bicarbazole (3,6 BCz‐OMeTAD or 2,7 BCz‐OMeTAD), are synthesized via an extremely simple route from very cheap raw materials. Owing to their excellent film‐forming abilities and matching energy levels, 3,6 BCz‐OMeTAD and 2,7 BCz‐OMeTAD can be successfully employed as a perfect ultrathin (≈30 nm) hole transporting layer in large‐area PSCs up to 1 cm2. The 3,6 BCz‐OMeTAD and 2,7 BCz‐OMeTAD based large‐area PSCs show highest PCEs up to 17.0% and 17.6%, respectively. More importantly, high performance large‐area PSCs based on 2,7 BCz‐OMeTAD retain 90% of the initial efficiency after 2000 h storage in an ambient environment without encapsulation. Two novel low‐cost N,N′‐bicarbazole‐based hole‐transporting material (HTMs), 3,6 BCz‐OMeTAD and 2,7 BCz‐OMeTAD, are developed as efficient dopant‐free HTMs for large‐area perovskite solar cells (PSCs). 1 cm2 large‐area PSCs using ultrathin, dopant‐free 3,6 BCz‐OMeTAD and 2,7 BCz‐OMeTAD as hole‐transporting layers exhibit excellent power conversion efficiencies up to 17.0% and 17.6%, respectively.
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