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- Title
High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells.
- Authors
Ru, Pengbin; Bi, Enbing; Zhang, Yao; Wang, Yanbo; Kong, Weiyu; Sha, Yongming; Tang, Wentao; Zhang, Peng; Wu, Yongzhen; Chen, Wei; Yang, Xudong; Chen, Han; Han, Liyuan
- Abstract
Inverted perovskite solar cells (PSCs) with low‐temperature processed hole transporting materials (HTMs) suffer from poor performance due to the inferior hole‐extraction capability at the HTM/perovskite interfaces. Here, molecules with controlled electron affinity enable a HTM with conductivity improved by more than ten times and a decreased energy gap between the Fermi level and the valence band from 0.60 to 0.24 eV, leading to the enhancement of hole‐extraction capacity by five times. As a result, the 3,6‐difluoro‐2,5,7,7,8,8‐hexacyanoquinodimethane molecules are used for the first time enhancing open‐circuit voltage (Voc) and fill factor (FF) of the PSCs, which enable rigid‐and flexible‐based inverted perovskite devices achieving highest power conversion efficiencies of 22.13% and 20.01%, respectively. This new method significantly enhances the Voc and FF of the PSCs, which can be widely combined with HTMs based on not only NiOx but also PTAA, PEDOTT:PSS, and CuSCN, providing a new way of realizing efficient inverted PSCs.
- Subjects
SOLAR cells; PEROVSKITE; OPEN-circuit voltage; FERMI level; VALENCE bands; ELECTRON affinity
- Publication
Advanced Energy Materials, 2020, Vol 10, Issue 12, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201903487