Design of new coumarin dyes having thiophene moieties for highly efficient organic-dye-sensitized solar cells
Kohjiro HaraPhotoreaction Control Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, JapanMitsuhiko KurashigePhotoreaction Control Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, JapanYasufumi Dan‐ohHayashibara Biochemical Laboratories, Inc., 564-176 Fujita, Okayama, JapanChiaki KasadaHayashibara Biochemical Laboratories, Inc., 564-176 Fujita, Okayama, JapanAkira ShinpoHayashibara Biochemical Laboratories, Inc., 564-176 Fujita, Okayama, JapanSadaharu SugaHayashibara Biochemical Laboratories, Inc., 564-176 Fujita, Okayama, JapanKazuhiro SayamaPhotoreaction Control Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, JapanHironori ArakawaPhotoreaction Control Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan
2003en
ABI
Abstract
We have developed new coumarin dyes having thiophene moieties in order to improve the photovoltaic performance of dye-sensitized nanocrystalline TiO2 solar cells based on the organic dyes as photosensitizers. A solar-energy-to-electricity conversion efficiency (η) of 7.7% was attained under AM 1.5 irradiation (100 mW cm−2) with a short-circuit current density (Jsc) of 14.3 mA cm−2, an open-circuit voltage (Voc) of 0.73 V, and a fill factor (ff) of 0.74.
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