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Inverted Perovskite Solar Cells Based on Small Molecular Hole Transport Material C 8 ‐Dioctylbenzothienobenzothiophene
Author(s) -
Lian Xiaomei,
Chen Jiehuan,
Zhang Yingzhu,
Wu Gang,
Chen Hongzheng
Publication year - 2019
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201900317
Subject(s) - pedot:pss , perovskite (structure) , chemistry , energy conversion efficiency , substrate (aquarium) , relative humidity , hysteresis , chemical engineering , optoelectronics , polymer , crystallography , materials science , organic chemistry , thermodynamics , oceanography , physics , quantum mechanics , engineering , geology
Summary of main observation and conclusion The small organic molecular Dioctylbenzothienobenzothiophene (C 8 ‐BTBT) has been explored as hole transport material (HTM) to replace PEDOT:PSS in inverted perovskite solar cells (PVSCs). MAPbI 3 perovskite films depositd onto C 8 ‐BTBT are smooth and uniform, with negligible residual of PbI 2 and large grain size even larger than 1 μm. Our champion C 8 ‐BTBT based devices reached a high power conversion efficiency (PCE) of 15.46% with marginal hysteresis, much higher than that of 11.50% achieved using PEDOT:PSS. Besides, devices adopting C 8 ‐BTBT as substrate show superior stability compared with the PEDOT:PSS based devices when stored under ambient conditions with a relative humidity of (25±5)%.