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Molecular Engineering of Simple Metal‐Free Organic Dyes Derived from Triphenylamine for Dye‐Sensitized Solar Cell Applications
Author(s) -
Ferdowsi Parnian,
Saygili Yasemin,
Jazaeri Farzan,
Edvinsson Tomas,
Mokhtari Javad,
Zakeeruddin Shaik M.,
Liu Yuhang,
Grätzel Michael,
Hagfeldt Anders
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201902245
Subject(s) - triphenylamine , triiodide , iodide , dye sensitized solar cell , electrolyte , photochemistry , redox , bipyridine , energy conversion efficiency , ruthenium , solar cell , materials science , open circuit voltage , chemistry , inorganic chemistry , organic chemistry , electrode , catalysis , optoelectronics , physics , voltage , quantum mechanics , crystal structure
Two new metal‐free organic sensitizers, L156 and L224, were designed, synthesized, and characterized for application in dye‐sensitized solar cells (DSCs). The structures of the dyes contain a triphenylamine (TPA) segment and 4‐(benzo[ c ][1,2,5]thiadiazol‐4‐yl)benzoic acid as electron‐rich and ‐deficient moieties, respectively. Two different π bridges, thiophene and 4,8‐bis(4‐hexylphenyl)benzo[1,2‐ b :4,5‐ b ′]dithiophene, were used for L156 and L224, respectively. The influence of iodide/triiodide, [Co(bpy) 3 ] 2+/3+ (bpy=2,2′‐bipyridine), and [Cu(tmby) 2 ] 2+/+ (tmby=4,4′,6,6′‐tetramethyl‐2,2′‐bipyridine) complexes as redox electrolytes and 18 NR‐T and 30 NR‐D transparent TiO 2 films on the DSC device performance was investigated. The L156‐based DSC with [Cu(tmby) 2 ] 2+/+ complexes as the redox electrolyte resulted in the best performance of 9.26 % and a remarkably high open‐circuit voltage value of 1.1 V (1.096 V), with a short‐circuit current of 12.2 mA cm −2 and a fill factor of 0.692, by using 30 NR‐D TiO 2 films. An efficiency of up to 21.9 % was achieved under a 1000 lx indoor light source, which proved that dye L156 was also an excellent candidate for indoor applications. The maximal monochromatic incident‐photon‐to‐current conversion efficiency of L156–30 NR‐D reached up to 70 %.