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Effect of Structural Non-Planarity and pi-Conjugated Unit of Novel Bicarbazole Derivatives for Dye-Sensitized Solar Cells
- Effect of Structural Non-Planarity and pi-Conjugated Unit of Novel Bicarbazole Derivatives for Dye-Sensitized Solar Cells
- Jo, Hyo Jeong; Nam, Jung Em; Kim, Hyo Jeong; Kim, Dae Hwan; Hwang, Dae Kue; Kang, Jin Kyu
- DGIST Authors
- Hwang, Dae Kue; Kang, Jin Kyu
- Issue Date
- Science Of Advanced Materials, 8(7), 1381-1389
- Article Type
- EFFICIENT MOLECULAR PHOTOVOLTAICS; ORGANIC-DYES; CHARGE-TRANSFER; CARBAZOLE; DESIGN; DONOR; PERFORMANCE; ACCEPTOR
- Novel bicarbazole-based organic dyes (hereafter denoted as BEC, BECS1, and BECS2) having nonplanar structures were designed and synthesized; for comparison, the corresponding dye (EC) with a planar structure was also synthesized. The effects of length of the π-conjugated unit on the photophysical, electrochemical, and photovoltaic properties of the dyes were investigated. The results showed that the nonplanar molecular structure helps in preventing charge recombination. In addition, more extended π-conjugated systems should lead to long-wavelength absorption, broadening of the absorption profile, and enhancement of the molar extinction coefficient with respect to those of D-π-A sensitizers. These factors collectively contribute to improved light harvesting. The maximum power conversion efficiency reached 6.4% in the case of BECS2 under an opencircuit voltage of 0.653 V and short-circuit photocurrent density of 15.45 mA cm-2, which could be due to the relatively high absorption ability of this dye. © 2016 by American Scientific Publishers.
- AMER SCIENTIFIC PUBLISHERS
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- Convergence Research Center for Solar Energy1. Journal Articles
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