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Efficient Hole‐Transporting Materials with Triazole Core for High‐Efficiency Perovskite Solar Cells
Author(s) -
Choi Hyeju,
Jo Hyeonjun,
Paek Sanghyun,
Koh Kyungkuk,
Ko Haye Min,
Lee Jae Kwan,
Ko Jaejung
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.201501178
Subject(s) - stacking , perovskite (structure) , materials science , energy conversion efficiency , intramolecular force , photovoltaic system , acceptor , intermolecular force , molecule , optoelectronics , crystallography , chemistry , stereochemistry , organic chemistry , physics , condensed matter physics , ecology , biology
Efficient hole‐transporting materials (HTMs), TAZ‐[MeOTPA] 2 and TAZ‐[MeOTPATh] 2 incorporating two electron‐rich diphenylamino side arms, through direct linkage or thiophen bridges, respectively, on the C3‐ and C5‐positions of a 4‐phenyl‐1,2,4‐triazole core were synthesized. These synthetic HTMs with donor–acceptor type molecular structures exhibited effective intramolecular charge transfer for improving the hole‐transporting properties. The structural modification of HTMs by thiophene bridging might increase intermolecular π–π stacking in the solid state and afford a better spectral response because of their increased π‐conjugation length. Perovskite‐based cells using TAZ‐[MeOTPA] 2 and TAZ‐[MeOTPATh] 2 as HTMs afforded high power conversion efficiencies of 10.9 % and 14.4 %, respectively, showing a photovoltaic performance comparable to that obtained using spiro‐OMeTAD. These synthetically simple and inexpensive HTMs hold promise for replacing the more expensive spiro‐OMeTAD in high‐efficiency perovskite solar cells.