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Triphenylamine Groups Improve Blocking Behavior of Phenoxazine Dyes in Cobalt‐Electrolyte‐Based Dye‐Sensitized Solar Cells
Author(s) -
Hao Yan,
Tian Haining,
Cong Jiayan,
Yang Wenxing,
Bora Ilkay,
Sun Licheng,
Boschloo Gerrit,
Hagfeldt Anders
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402474
Subject(s) - phenoxazine , triphenylamine , cobalt , dye sensitized solar cell , alkoxy group , blocking effect , chemistry , electrolyte , photochemistry , inorganic chemistry , organic chemistry , electrode , alkyl , medicine , psychology , developmental psychology , phenothiazine , pharmacology
Novel phenoxazine dyes are successfully introduced as sensitizers into dye‐sensitized solar cells (DSCs) with cobalt‐based electrolyte. In sensitizers with triphenylamine (TPA) groups recombination from electrons in the TiO 2 conduction band to the cobalt(III) species is suppressed. The effect of the steric properties of the phenoxazine sensitizers on the overall device performance and on recombination and regeneration processes is compared. Optimized DSCs sensitized with IB2 having two TPA groups in combination with tris(2,2′‐bipyridyl) cobalt(II/III) yield efficiencies of 6.3 %, similar to that of IB3 , which is equipped with mutiple alkoxy groups. TH310 with only one TPA group gives lower efficiency and open circuit voltage, while IB1 without TPA groups performs even worse. These results demonstrate that both TPA groups on the IB2 are needed for an efficient blocking effect. These results reveal a possible new role for TPA units in DSC sensitizer design.