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14.2% Efficiency Dye‐Sensitized Solar Cells by Co‐sensitizing Novel Thieno[3,2‐ b ]indole‐Based Organic Dyes with a Promising Porphyrin Sensitizer
Author(s) -
Ji JungMin,
Zhou Haoran,
Eom Yu Kyung,
Kim Chul Hoon,
Kim Hwan Kyu
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202000124
Subject(s) - dye sensitized solar cell , porphyrin , chromophore , indole test , materials science , photochemistry , biphenyl , redox , organic solar cell , acceptor , polymer chemistry , electrolyte , chemistry , stereochemistry , organic chemistry , electrode , polymer , composite material , metallurgy , condensed matter physics , physics
A new series of 4‐hexyl‐4 H ‐thieno[3,2‐ b ]indole (HxTI) based organic chromophores is developed by structural engineering of the electron donor (D) group in the D–HxTI–benzothiadiazole‐phenyl‐acceptor platform with different fluorenyl moieties, such as unsubstituted fluorenyl (SGT‐146) and hexyloxy (SGT‐147), decyloxy (SGT‐148) and hexyloxy‐phenyl substituted (SGT‐149) fluorenyl moieties. In comparison to a reference dye SGT‐137 with a biphenyl‐based donor, the effects of the donating ability and bulkiness of the fluorenyl based donor in this D–π–A‐structured platform on molecular properties and photovoltaic performance are investigated to establish the structure–property relationship. The photovoltaic performance of dye‐sensitized solar cells (DSSCs) is improved according to the bulkiness of the donor groups. As a result, the DSSCs based on SGT‐149 show high power conversion efficiencies (PCEs) of 11.7% and 10.0% with a [Co(bpy) 3 ] 2+/3+ (bpy = 2,2′‐bipyridine) and an I − /I 3 − redox electrolyte, respectively. Notably, the co‐sensitization of SGT‐149 with a SGT‐021 porphyrin dye by utilizing a simple “cocktail” method, exhibit state‐of‐the‐art PCEs of 14.2% and 11.6% with a [Co(bpy) 3 ] 2+/3+ and an I − /I 3 − redox electrolyte, respectively.