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Hole‐Transporting Small Molecules Based on Thiophene Cores for High Efficiency Perovskite Solar Cells
Author(s) -
Li Hairong,
Fu Kunwu,
Boix Pablo P.,
Wong Lydia H.,
Hagfeldt Anders,
Grätzel Michael,
Mhaisalkar Subodh G.,
Grimsdale Andrew C.
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402587
Subject(s) - thiophene , energy conversion efficiency , perovskite (structure) , molecule , tetra , materials science , small molecule , solar cell , chemistry , optoelectronics , medicinal chemistry , organic chemistry , biochemistry
Two new electron‐rich molecules, 2,3,4,5‐tetra[4,4′‐bis(methoxyphenyl)aminophen‐4“‐yl]‐thiophene (H111) and 4,4′,5,5′‐tetra[4,4′‐bis(methoxyphenyl)aminophen‐4”‐yl]‐2,2′‐bithiophene (H112), which contain thiophene cores with arylamine side groups, are reported. When used as the hole‐transporting material (HTM) in perovskite‐based solar cell devices, power conversion efficiencies of up to 15.4 % under AM 1.5G solar simulation were obtained. This is the highest efficiency achieved with HTMs not composed of 2,2′,7,7′‐tetrakis( N , N ′‐di‐ p ‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) and its isomers. Both HTMs, especially H111, have great potential to replace expensive spiro‐OMeTAD given their much simpler and less expensive syntheses.