Low-Cost N,N″-Bicarbazole-Based Dopant-Free Hole-Transporting Materials for Large-Area Perovskite Solar Cells

Chengrong Yin, Jianfeng Lu, Yachao Xu, Yikai Yun, Kai Wang, Jiewei Li, Liangcong Jiang, Jingsong Sun, Andrew D. Scully, Fuzhi Huang, Jie Zhong, Jianpu Wang, Yi Bing Cheng, Tianshi Qin, Wei Huang

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Abstract

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.

Original languageEnglish
Article number1800538
Number of pages10
JournalAdvanced Energy Materials
Volume8
Issue number21
DOIs
Publication statusPublished - 25 Jul 2018

Keywords

  • dopant-free hole-transporting materials
  • large-area perovskite solar cells
  • low-cost
  • N,N′-bicarbazole

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