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Fully Air‐Processed Carbon‐Based Efficient Hole Conductor Free Planar Heterojunction Perovskite Solar Cells With High Reproducibility and Stability
Author(s) -
Li Fangjie,
Wang Changlei,
Liu Pei,
Xiao Yuqing,
Bai Lihua,
Qi Fei,
Hou Xiaoyi,
Zhang Huijie,
Wang Yuan,
Wang Shaofu,
Zhao XingZhong
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201800297
Subject(s) - materials science , perovskite (structure) , optoelectronics , fabrication , heterojunction , energy conversion efficiency , planar , carbon fibers , nanotechnology , chemical engineering , composite material , computer science , composite number , medicine , alternative medicine , computer graphics (images) , pathology , engineering
Organic‐inorganic hybrid metal halide perovskite solar cells have gained tremendous research interest in the past few years. Here, highly reproducible and efficient planar heterojunction perovskite solar cells (PHJ‐PVSCs) with good stability are fabricated using one‐step processed compact TiO 2 as electron‐selective layers (ESLs) and carbon as counter electrodes with no requirements of hole conductors. The fabrication process is fully conducted in ambient air with relatively high humidity (≥45%). Our PVSCs have a simplified planar architecture with only a compact TiO 2 ESL and carbon layer sandwiched with a methylammonium lead triiodide light absorber. Our best‐performing cell shows a good power conversion efficiency of 13.52% and superb illumination stability for 1200 s with no decrease under one sun. Our unencapsulated devices also show great thermal stability, retaining 90% of their initial efficiencies for 72 h under thermal stress at 80 °C in air. Notably, the open‐circuit voltage of our planar PVSCs are always over 1 V, and the best one is 1.07 V, which is the highest value ever reported for carbon‐based hole conductor free PVSCs. Our research demonstrates the feasibility of a fully ambient air fabrication process for carbon‐based PHJ‐PVSCs in simplified device architecture and paves the way to their further commercialization.