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Dopant‐Free Hole‐Transporting Materials for Stable and Efficient Perovskite Solar Cells |
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| Authors: | Sanghyun Paek Peng Qin Yonghui Lee Kyung Taek Cho Peng Gao Giulia Grancini Emad Oveisi Paul Gratia Kasparas Rakstys Shaheen A. Al‐Muhtaseb Christian Ludwig Jaejung Ko Mohammad Khaja Nazeeruddin |
| Affiliation: | 1. Group for Molecular Engineering of Functional Materials, école Polytechnique Fédérale de Lausanne, Sion, Switzerland;2. ENAC IIE GR‐LUD, école Polytechnique Fédérale de Lausanne, Lausanne, Switzerland;3. Interdisciplinary Centre for Electron Microscopy, école Polytechnique Fédérale de Lausanne, Lausanne, Switzerland;4. Department of Chemical Engineering, Qatar University, Doha, Qatar;5. Department of New Material Chemistry, Korea University, Jochiwon, Chungnam, South Korea |
| Abstract: | Molecularly engineered novel dopant‐free hole‐transporting materials for perovskite solar cells (PSCs) combined with mixed‐perovskite (FAPbI3)0.85(MAPbBr3)0.15 (MA: CH3NH3+, FA: NH=CHNH3+) that exhibit an excellent power conversion efficiency of 18.9% under AM 1.5 conditions are investigated. The mobilities of FA‐CN, and TPA‐CN are determined to be 1.2 × 10?4 cm2 V?1 s?1 and 1.1 × 10?4 cm2 V?1 s?1, respectively. Exceptional stability up to 500 h is measured with the PSC based on FA‐CN. Additionally, it is found that the maximum power output collected after 1300 h remained 65% of its initial value. This opens up new avenue for efficient and stable PSCs exploring new materials as alternatives to Spiro‐OMeTAD. |
| Keywords: | dopant‐free hole‐transport materials perovskite solar cells photovoltaic stability |