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Molecular Engineered Hole‐Extraction Materials to Enable Dopant‐Free, Efficient p‐i‐n Perovskite Solar Cells
Author(s) -
Chen Huanle,
Fu Weifei,
Huang Chuyi,
Zhang Zhongqiang,
Li Shuixing,
Ding Feizhi,
Shi Minmin,
Li ChangZhi,
Jen Alex K.Y.,
Chen Hongzheng
Publication year - 2017
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.201700012
Subject(s) - perovskite (structure) , materials science , passivation , dopant , heterojunction , photovoltaic system , hysteresis , extraction (chemistry) , fabrication , molecule , nanotechnology , optoelectronics , chemical engineering , doping , chemistry , organic chemistry , electrical engineering , medicine , physics , alternative medicine , layer (electronics) , quantum mechanics , engineering , pathology
Two hole‐extraction materials (HEMs), TPP‐OMeTAD and TPP‐SMeTAD, have been developed to facilitate the fabrication of efficient p‐i‐n perovskite solar cells (PVSCs). By replacing the oxygen atom on HEM with sulfur (from TPP‐OMeTAD to TPP‐SMeTAD), it effectively lowers the highest occupied molecular orbital of the molecule and provides stronger PbS interaction with perovskites, leading to efficient charge extraction and surface traps passivation. The TPP‐SMeTAD‐based PVSCs exhibit both improved photovoltaic performance and reduced hysteresis in p‐i‐n PVSCs over those based on TPP‐OMeTAD. This work not only provides new insights on creating perovskite‐HEM heterojunction but also helps in designing new HEM to enable efficient organic–inorganic hybrid PVSCs.