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Dopant‐Free Hole Transporting Polymers for High Efficiency, Environmentally Stable Perovskite Solar Cells
Author(s) -
Liao HsuehChung,
Tam Teck Lip Dexter,
Guo Peijun,
Wu Yilei,
Manley Eric F.,
Huang Wei,
Zhou Nanjia,
Soe Chan Myae Myae,
Wang Binghao,
Wasielewski Michael R.,
Chen Lin X.,
Kanatzidis Mercouri G.,
Facchetti Antonio,
Chang Robert P. H.,
Marks Tobin J.
Publication year - 2016
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201600502
Subject(s) - perovskite (structure) , materials science , dopant , energy conversion efficiency , heterojunction , halide , solar cell , polymer , chemical engineering , nanotechnology , degradation (telecommunications) , electron mobility , optoelectronics , doping , inorganic chemistry , composite material , electrical engineering , chemistry , engineering
Over the past five years, a rapid progress in organometal‐halide perovskite solar cells has greatly influenced emerging solar energy science and technology. In perovksite solar cells, the overlying hole transporting material (HTM) is critical for achieving high power conversion efficiencies (PCEs) and for protecting the air‐sensitive perovskite active layer. This study reports the synthesis and implementation of a new polymeric HTM series based on semiconducting 4,8‐dithien‐2‐yl‐benzo[1,2‐ d ;4,5‐ d ′]bistriazole‐ alt ‐benzo[1,2‐ b :4,5‐ b ′]dithiophenes (pBBTa‐BDTs), yielding high PCEs and environmentally‐stable perovskite cells. These intrinsic (dopant‐free) HTMs achieve a stabilized PCE of 12.3% in simple planar heterojunction cells—the highest value to date for a polymeric intrinsic HTM. This high performance is attributed to efficient hole extraction/collection (the most efficient pBBTa‐BDT is highly ordered and orients π‐face‐down on the perovskite surface) and balanced electron/hole transport. The smooth, conformal polymer coatings suppress aerobic perovskite film degradation, significantly enhancing the solar cell 85 °C/65% RH PCE stability versus typical molecular HTMs.