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论文类型：期刊论文

发表时间：2020-03-01

发表刊物：SOLAR RRL

收录刊物：SCIE

卷号：4

期号：3

ISSN号：2367-198X

关键字：dye-sensitized solar cells; electron acceptors; electron-injection efficiency; time-resolved photoluminescence

摘要：High electron-injection efficiency is important for further development of dye-sensitized solar cells (DSSCs). Different electron acceptors have different electron-injection capabilities, which affect device performance. Herein, the effects of two organic triazatruxene (TAT)-based donor-pi-bridge-acceptor sensitizers applied in DSSCs are reported. The sensitizers have either rigid 4-ethynyl benzoic acid (EBA) or Z-type cyanoacrylic acid (CA) as their electron acceptor, denoted as ZL003 and ZL005, respectively. Time-resolved photoluminescence (TR-PL) spectroscopy is applied to reveal the electron transfer dynamics between the sensitizers and TiO2 films. Notably, ZL003 has higher electron-injection efficiency compared with that of ZL005, which is consistent with the higher efficiency and photocurrent of devices based on the former. The dye loading of ZL003 is nearly twice as great as that of ZL005, which accounts for the lower photocurrent of the device. The charge recombination lifetimes for the two dyes are consistent with their open-circuit voltage. Consequently, the ZL003-based devices achieve a higher power conversion efficiency of 13.4% compared with only 7.2% for ZL005.