He Zhen, Xiong Jian, Dai Qilin, Yang Bingchu, Zhang Jian, Xiao Si
Institute of Super-microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha 410083, Hunan, China.
Nanoscale. 2020 Mar 28;12(12):6767-6775. doi: 10.1039/d0nr01142h. Epub 2020 Mar 13.
Grain boundary (GB) and interface passivation of perovskite films impacts the efficiency and stability of perovskite solar cells (PSCs) dramatically. Here, an efficient passivation strategy using 4-diaminomethylbenzoic (4-DA) followed by thermal annealing treatment is proposed to improve the performance of PSCs. We have systemically investigated the impact of 4-DA on the physical properties of the perovskite layer and corresponding performance of the inverted PSCs. The results show that the contact between crystalline grains is improved, and high quality MAPbI films are successfully prepared, which result in the elimination of trap states and enhanced performance of the devices. The highest power conversion efficiency (PCE) of 20.58% is achieved in this work. Meanwhile, the devices show enhanced stability and the average PCE values almost remained the same after 168 hours of storage without any encapsulation. The passivation method developed in this work shows a novel strategy toward the fabrication of inverted PSCs with high efficiency and high stability.
钙钛矿薄膜的晶界（GB）和界面钝化对钙钛矿太阳能电池（PSC）的效率和稳定性有显著影响。在此，提出了一种使用4-二氨基甲基苯甲酸（4-DA）并随后进行热退火处理的有效钝化策略，以提高PSC的性能。我们系统地研究了4-DA对钙钛矿层物理性质和相应倒置PSC性能的影响。结果表明，晶粒之间的接触得到改善，成功制备了高质量的MAPbI薄膜，这导致陷阱态的消除和器件性能的提高。在这项工作中实现了20.58%的最高功率转换效率（PCE）。同时，器件显示出增强的稳定性，在没有任何封装的情况下储存168小时后，平均PCE值几乎保持不变。这项工作中开发的钝化方法为制备具有高效率和高稳定性的倒置PSC提供了一种新策略。
