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Highly Efficient p‐i‐n Perovskite Solar Cells Utilizing Novel Low‐Temperature Solution‐Processed Hole Transport Materials with Linear π‐Conjugated Structure
Author(s) -
Li Yang,
Xu Zheng,
Zhao Suling,
Qiao Bo,
Huang Di,
Zhao Ling,
Zhao Jiao,
Wang Peng,
Zhu Youqin,
Li Xianggao,
Liu Xicheng,
Xu Xurong
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201601603
Subject(s) - pedot:pss , materials science , perovskite (structure) , conjugated system , dopant , grain boundary , benzene , biphenyl , chemical engineering , layer (electronics) , optoelectronics , nanotechnology , composite material , polymer , doping , organic chemistry , chemistry , microstructure , engineering
Alternative low‐temperature solution‐processed hole‐transporting materials (HTMs) without dopant are critical for highly efficient perovskite solar cells (PSCs). Here, two novel small molecule HTMs with linear π‐conjugated structure, 4,4′‐bis(4‐(di‐ p ‐toyl)aminostyryl)biphenyl (TPASBP) and 1,4′‐bis(4‐(di‐ p ‐toyl)aminostyryl)benzene (TPASB), are applied as hole‐transporting layer (HTL) by low‐temperature (sub‐100 °C) solution‐processed method in p‐i‐n PSCs. Compared with standard poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS) HTL, both TPASBP and TPASB HTLs can promote the growth of perovskite (CH 3 NH 3 PbI 3 ) film consisting of large grains and less grain boundaries. Furthermore, the hole extraction at HTL/CH 3 NH 3 PbI 3 interface and the hole transport in HTL are also more efficient under the conditions of using TPASBP or TPASB as HTL. Hence, the photovoltaic performance of the PSCs is dramatically enhanced, leading to the high efficiencies of 17.4% and 17.6% for the PSCs using TPASBP and TPASB as HTL, respectively, which are ≈40% higher than that of the standard PSC using PEDOT:PSS HTL.