Trilateral π-conjugation extensions of phenothiazine-based dyes enhance the photovoltaic performance of the dye-sensitized solar cells
作者:Zafar Iqbal、Wu-Qiang Wu、Zu-Sheng Huang、Lingyun Wang、Dai-Bin Kuang、Herbert Meier、Derong Cao
DOI:10.1016/j.dyepig.2015.09.001
日期:2016.1
Two novel organic dyes TLEP-1 and TLEP-2 based on phenothiazine with trilateral pi-conjugation extensions were designed and synthesized for dye-sensitized solar cells, where phenothiazine ring was linked with two phenyl moieties at 7- and 10-positions as the first and second pi-conjugation extensions, and with furan or thiophene ring at 3-position as the third pi-conjugation extension for TLEP-1 and TLEP-2, respectively. The influence of the pi-conjugation extensions on the photovoltaic performance was evaluated. The cell based on TLEP-2 exhibits an impressive short-circuit photocurrent density of 14.87 mA cm(-2), which is much higher than the cell based on the reference dye without pi-conjugation extension (9.01 mA cm(-2)), leading to high power conversion efficiency of 7.33% under simulated AM 1.5 G illumination condition. The results indicate that the trilateral pi-conjugation extensions are an effective way to improve the photovoltaic performance of the dye-sensitized solar cells. (C) 2015 Elsevier Ltd. All rights reserved.