Duan Hairui, Lin Zhichao, Xu Xiangning, Song Qili, Dong Hongye, Gao Xiaowen, Mu Cheng, Ouyang Xinhua
Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing, 100872, P. R. China.
Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, P. R. China.
Chemistry. 2023 Dec 19;29(71):e202302703. doi: 10.1002/chem.202302703. Epub 2023 Nov 5.
Defects present on the top surface of perovskite films have a pronounced detrimental impact on the photovoltaic performance and stability of perovskite solar cells (PSCs). Consequently, the development of effective defect passivation strategies has become key in enhancing both the power conversion efficiency (PCE) and stability of PSCs. In this study, a small molecule material, 4-Aminophthalonitrile (4-APN), was introduced as a means to mitigate surface defects within perovskite films. Obviously, 4-APN effectively passivates the defects at grain boundaries by combining cyano groups (-C≡N) with Pb , significantly reducing the density of defect states, inhibiting non-radiative recombination at the interface, and promoting the charge transfer efficiency from the perovskite layer to the hole transport layer. The 4-APN modification led to a significant upswing in the PCE, while concurrently bolstering the overall device stability. Importantly, the devices on 4-APN as passivation additive exhibited negligible performance degradation aging for 1200 h.
钙钛矿薄膜顶表面存在的缺陷对钙钛矿太阳能电池（PSC）的光伏性能和稳定性有显著的不利影响。因此，开发有效的缺陷钝化策略已成为提高PSC的功率转换效率（PCE）和稳定性的关键。在本研究中，引入了一种小分子材料4-氨基邻苯二甲腈（4-APN），作为减轻钙钛矿薄膜表面缺陷的一种手段。显然，4-APN通过将氰基（-C≡N）与Pb结合，有效地钝化了晶界处的缺陷，显著降低了缺陷态密度，抑制了界面处的非辐射复合，并提高了从钙钛矿层到空穴传输层的电荷转移效率。4-APN修饰导致PCE显著提高，同时增强了整个器件的稳定性。重要的是，以4-APN作为钝化添加剂的器件在1200小时的老化过程中表现出可忽略不计的性能退化。
