光电流
色素敏化染料
电子受体
苯甲酸
光化学
能量转换效率
电子供体
接受者
光致发光
材料科学
电子转移
开路电压
电子传输链
化学
光谱学
光电子学
电压
电解质
有机化学
催化作用
电极
物理
物理化学
量子力学
生物化学
凝聚态物理
作者
Li Zhang,Xichuan Yang,Shuping Li,Ze Yu,Anders Hagfeldt,Licheng Sun
出处
期刊:Solar RRL
[Wiley]
日期:2019-11-14
卷期号:4 (3)
被引量:23
标识
DOI:10.1002/solr.201900436
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‐π‐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 TiO 2 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.
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