Keywords
D–π–A structure
dye-sensitized solar cells
metal-free dyes
rhodanine-3-acetic acid
thieno[32-b]indoles
Abstract
Five new dyes with D–π–A structure bearing 5-(methylene)-rhodanine-3-acetic acid as an acceptor-anchoring part and thieno[3,2-b]indole or benzo[g]thieno[3,2-b]indole as an electron-donating part were synthesized and applied as photosensitizers for dye-sensitized solar cells (DSSCs). In addition, thermal stability, optical and electrochemical properties of these dyes were investigated. The highest PCE value of 1.09% (Jsc = 3.01 mA cm–2, Voc = 0.53 V, FF = 0.69) was achieved for DSSC based on benzo[g]thieno[3,2-b]indole dye under AM 1.5G irradiation.
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