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Triphenylamine–Thienothiophene Organic Charge‐Transport Molecular Materials: Effect of Substitution Pattern on their Thermal, Photoelectrochemical, and Photovoltaic Properties
Author(s) -
Le Thi Huong,
Dao QuangDuy,
Nghiêm MaiPhuong,
Péralta Sébastien,
Guillot Regis,
Pham Quoc Nghi,
Fujii Akihiko,
Ozaki Masanori,
Goubard Fabrice,
Bui ThanhTuân
Publication year - 2018
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.201701790
Subject(s) - triphenylamine , photovoltaic system , materials science , photochemistry , thermal , energy conversion efficiency , chemical engineering , optoelectronics , chemistry , physics , meteorology , engineering , ecology , biology
Two readily accessible thienothiophene–triphenylamine charge‐transport materials have been synthesized by simply varying the substitution pattern of the triphenylamine groups on a central thienothiophene π‐linker. The impact of the substitution pattern on the thermal, photoelectrochemical, and photovoltaic properties of these materials was evaluated and, based on theoretical and experimental studies, we found that the isomer in which the triphenylamine groups were located at the 2,5‐positions of the thienothiophene core ( TT‐2,5‐TPA ) had better π‐conjugation than the 3,6‐isomer ( TT‐3,6‐TPA ). Whilst the thermal, morphological, and hydrophobic properties of the two materials were similar, their optoelectrochemical and photovoltaic properties were noticeably impacted. When applied as hole‐transport materials in hybrid perovskite solar cells, the 2,5‐isomer exhibited a power‐conversion efficiency of 13.6 %, much higher than that of its 3,6‐counterpart (0.7 %) under the same standard conditions.