Triphenylamine–Thienothiophene Organic Charge‐Transport Molecular Materials: Effect of Substitution Pattern on their Thermal,Photoelectrochemical, and Photovoltaic Properties |
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Authors: | Thi Huong Le Dr. Quang‐Duy Dao Dr. Mai‐Phuong Nghiêm Prof. Sébastien Péralta Dr. Regis Guillot Prof. Quoc Nghi Pham Prof. Akihiko Fujii Prof. Masanori Ozaki Prof. Fabrice Goubard Prof. Thanh‐Tuân Bui |
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Affiliation: | 1. Laboratoire de Physicochimie des Polymères et des Interfaces, Université de Cergy-Pontoise, Neuville-sur-Oise, France;2. Division of Electrical, Electronic and Informational Engineering, Osaka University, Suita-shi, Osaka-fu, Japan;3. Plateforme Microscopies et Analyses, Fédération Institut des Matériaux (iMAT), Université de Cergy-Pontoise, Neuville-sur-Oise, France;4. Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université Paris Sud, Université Paris Saclay, Orsay Cedex, France |
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Abstract: | 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. |
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Keywords: | hole-transport materials materials science nitrogen heterocycles solar cells sulfur heterocycles |
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