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Efficient and Stable Solid‐State Dye‐Sensitized Solar Cells Based on a High‐Molar‐Extinction‐Coefficient Sensitizer
Author(s) -
Wang Mingkui,
Moon SooJin,
Xu Mingfei,
Chittibabu Kethineni,
Wang Peng,
CeveyHa NgocLe,
HumphryBaker Robin,
Zakeeruddin Shaik M.,
Grätzel Michael
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200901317
Subject(s) - molar absorptivity , dye sensitized solar cell , ruthenium , materials science , energy conversion efficiency , photovoltaic system , photochemistry , solar cell , bipyridine , optoelectronics , chemistry , optics , electrode , crystallography , organic chemistry , catalysis , crystal structure , ecology , physics , electrolyte , biology
Abstract The high‐molar‐extinction‐coefficient heteroleptic ruthenium dye, cis‐Ru (4,4′‐bis(5‐octylthieno[3,2‐b] thiophen‐2‐yl)‐2,2′‐bipyridine) (4,4′‐dicarboxyl‐2,2′‐bipyridine) (NCS) 2 , exhibits an AM 1.5 solar (100 mW cm −2 )‐to‐electric power‐conversion efficiency of 4.6% in a solid‐state dye‐sensitized solar cell (SSDSC) with 2,2′, 7,7′‐tetrakis‐( N , N ‐di‐p‐methoxyphenylamine)9,9′‐spirobifluorene (spiro‐MeOTAD) as the organic hole‐transporting material. These SSDSC devices exhibit good durability during accelerated tests under visible‐light soaking for 1000 h at 60 °C. This demonstration elucidates a class of photovoltaic devices with potential for stable and low‐cost power generation. The electron recombination dynamics and charge collection that take place at the dye‐sensitized heterojunction are studied by means of impedance and transient photovoltage decay techniques.