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3,4‐Phenylenedioxythiophene (PheDOT) Based Hole‐Transporting Materials for Perovskite Solar Cells
Author(s) -
Chen Jian,
Chen BaiXue,
Zhang FangShuai,
Yu HuiJuan,
Ma Shuang,
Kuang DaiBin,
Shao Guang,
Su ChengYong
Publication year - 2016
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201501423
Subject(s) - energy conversion efficiency , materials science , perovskite (structure) , electron mobility , photovoltaic system , photoluminescence , current density , optoelectronics , short circuit , absorption spectroscopy , electrochemistry , diffraction , open circuit voltage , perovskite solar cell , absorption (acoustics) , nanotechnology , crystallography , optics , chemistry , electrode , voltage , electrical engineering , composite material , physics , quantum mechanics , engineering
Two new electron‐rich molecules based on 3,4‐phenylenedioxythiophene (PheDOT) were synthesized and successfully adopted as hole‐transporting materials (HTMs) in perovskite solar cells (PSCs). X‐ray diffraction, absorption spectra, photoluminescence spectra, electrochemical properties, thermal stabilities, hole mobilities, conductivities, and photovoltaic parameters of PSCs based on these two HTMs were compared with each other. By introducing methoxy substituents into the main skeleton, the energy levels of PheDOT‐core HTM were tuned to match with the perovskite, and its hole mobility was also improved (1.33×10 −4 cm 2 V −1 s −1 , being higher than that of spiro‐OMeTAD, 2.34×10 −5 cm 2 V −1 s −1 ). The PSC based on MeO‐PheDOT as HTM exhibits a short‐circuit current density ( J sc ) of 18.31 mA cm −2 , an open‐circuit potential ( V oc ) of 0.914 V, and a fill factor ( FF ) of 0.636, yielding an encouraging power conversion efficiency (PCE) of 10.64 % under AM 1.5G illumination. These results give some insight into how the molecular structures of HTMs affect their performances and pave the way for developing high‐efficiency and low‐cost HTMs for PSCs.