ABSTRACT
We designed and synthesized the photosensitive π-conjugated organic dyes (CB-1, CB-2 and CB-3) with the carbazole substituted triphenylamine moiety as an electron donor unit and the cyanoacetic acid moiety as an acceptor for the application as a photosensitizer of dye-sensitized solar cells. The dyes with two carbazole units connected to triphenylamine moiety (CB-2 and CB-3) showed enhanced electron donating property than the one with one carbazole moiety as an electron donor unit (CB-1), which resulted in longer absorption maximum wavelength, higher overall photon to current conversion efficiency and IPCE values. In particular, CB-3 showed an absorption maximum wavelength at 428 nm and overall solar-to-energy conversion efficiency of 7.58% at AM 1.5 illumination (100 mW.cm-2) without mask.
ABSTRACT
Donor-acceptor type organic dyes (TA-EDOT-CA and TA-DM-EDOT-CA) containing thiophenevinylene spacer with 3,4-ethylenedioxythiophene (EDOT) substituent were synthesized and characterized for dye-sensitized solar cells (DSSCs). TA-EDOT-CA and TA-DM-EDOT-CA showed 26700 and 28000 M(-1) x cm(-1) of molar absorption coefficient at 458 nm and 459 nm of UV/vis absorption maximum wavelength, respectively. The overall solar-to-energy conversion efficiency of TA-EDOT-CA and TA-DM-EDOT-CA was 8.26% and 7.23% under AM 1.5 illumination (100 mW cm(-2)) without mask, respectively.
ABSTRACT
We report highly efficient organic photosensitizers containing pi-conjugated alkoxy-substituted oligophenylenevinylene linkers with electron donor-acceptor units for dye-sensitized solar cells. TA-DM-CA showed an overall solar-to-energy conversion efficiency of 9.67% at AM 1.5 illumination (100 mW cm(-2)).
