Zhou Chaocheng, Zhang Tianju, Zhang Chao, Liu Xiaolin, Wang Jun, Lin Jia, Chen Xianfeng
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China.
Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, China.
Adv Sci (Weinh). 2022 Apr;9(11):e2103491. doi: 10.1002/advs.202103491. Epub 2022 Feb 13.
Perovskite solar cells (PSCs) have been propelled into the limelight over the past decade due to the rapid-growing power conversion efficiency (PCE). However, the internal defects and the interfacial energy level mismatch are detrimental to the device performance and stability. In this study, it is demonstrated that a small amount of indium (In ) ions in mixed cation and halide perovskites can effectively passivate the defects, improve the energy-level alignment, and reduce the exciton binding energy. Additionally, it is confirmed that In ions can significantly elevate the initial carrier temperature, slow down the hot-carrier cooling rate, and reduce the heat loss before carrier extraction. The device with 1.5% of incorporated In achieves a PCE of 22.4% with a negligible hysteresis, which is significantly higher than that of undoped PSCs (20.3%). In addition, the unencapsulated PSCs achieve long-term stability, which retain 85% of the original PCE after 3,000 h of aging in dry air. The obtained results demonstrate and promote the development of practical, highly efficient, and stable hot-carrier-enhanced PSCs.
在过去十年中，钙钛矿太阳能电池（PSC）因其快速增长的功率转换效率（PCE）而备受瞩目。然而，内部缺陷和界面能级失配对器件性能和稳定性不利。在本研究中，证明了混合阳离子和卤化物钙钛矿中的少量铟（In）离子可以有效地钝化缺陷、改善能级匹配并降低激子结合能。此外，证实In离子可以显著提高初始载流子温度、减慢热载流子冷却速率并减少载流子提取前的热损失。掺入1.5% In的器件实现了22.4%的PCE，滞后现象可忽略不计，这明显高于未掺杂的PSC（20.3%）。此外，未封装的PSC实现了长期稳定性，在干燥空气中老化3000小时后仍保留原始PCE的85%。所得结果证明并推动了实用、高效且稳定的热载流子增强型PSC的发展。
