| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 176577 | Dyes and Pigments | 2013 | 8 Pages |
Two bianchored metal free organic dyes (Car-th-CN and Dpa-th-CN) were designed and synthesized for DSSC application, in which carbazole or diphenylamine moieties were used as the donor, cyano vinyl thiophene unit as the π-bridge and cyanoacrylic acid group as the electron acceptor. The structures of the synthesized dyes were confirmed by NMR, HR-Mass and elemental analysis. The optical, electrochemical, theoretical and photovoltaic properties of the synthesized dyes were investigated. Fabricated photovoltaic devices based on carbazole unit as a donor (Car-th-CN) showed a maximum current conversion efficiency of 4.04% under AM 1.5 illumination (85 mW cm−2) and monochromatic incident photon to current efficiency (IPCE) of 38.1%. The reason for the higher efficiency of Car-th-CN is due to the planar nature of carbazole moiety and hence increases the capability of adsorbed dye amount and electron lifetime in TiO2 surface.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Synthesis of diphenylamine and carbazole donor based metal free organic dyes. ► The electrochemical, photophysical and theoretical properties were established for the synthesized dyes. ► Fabricated photovoltaic device based on carbazole as donor shows good efficiency.
