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 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.

中文翻译：

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用于染料敏化太阳能电池，氰基丙烯酸或苯甲酸的吸电子锚定敏化剂组？

高电子注入效率对染料敏化太阳能电池（DSSC）的进一步开发很重要。不同的电子受体具有不同的电子注入能力，这会影响器件性能。本文报道了在DSSC中使用的两种基于有机三氮杂tru烯（TAT）的供体-π-桥-受体敏化剂的作用。敏化剂具有刚性的4-乙炔基苯甲酸（EBA）或Z型氰基丙烯酸（CA）作为其电子受体，分别表示为ZL003和ZL005。时间分辨光致发光（TR-PL）光谱用于揭示敏化剂和TiO ₂之间的电子转移动力学电影。值得注意的是，ZL003具有比ZL005更高的电子注入效率，这与基于前者的器件的更高效率和光电流是一致的。ZL003的染料负载量几乎是ZL005的染料负载量的两倍，这说明该设备的光电流较低。两种染料的电荷复合寿命与它们的开路电压一致。因此，基于ZL003的设备实现了13.4％的更高功率转换效率，而ZL005仅为7.2％。