Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.
Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, 239 Zhangheng Road, Shanghai 201204, China.
Science. 2023 Jan 27;379(6630):399-403. doi: 10.1126/science.add7331. Epub 2023 Jan 26.
Daily temperature variations induce phase transitions and lattice strains in halide perovskites, challenging their stability in solar cells. We stabilized the perovskite black phase and improved solar cell performance using the ordered dipolar structure of β-poly(1,1-difluoroethylene) to control perovskite film crystallization and energy alignment. We demonstrated p-i-n perovskite solar cells with a record power conversion efficiency of 24.6% over 18 square millimeters and 23.1% over 1 square centimeter, which retained 96 and 88% of the efficiency after 1000 hours of 1-sun maximum power point tracking at 25° and 75°C, respectively. Devices under rapid thermal cycling between -60° and +80°C showed no sign of fatigue, demonstrating the impact of the ordered dipolar structure on the operational stability of perovskite solar cells.
每日温度变化会在卤化物钙钛矿中引起相变和晶格应变，从而影响其在太阳能电池中的稳定性。我们利用β-聚（1,1-二氟乙烯）的有序偶极结构来控制钙钛矿薄膜的结晶和能量排列，从而稳定钙钛矿的黑相并提高太阳能电池的性能。我们展示了 p-i-n 钙钛矿太阳能电池，其在 18 平方毫米和 1 平方厘米面积上的功率转换效率分别达到了 24.6%和 23.1%，在 25°C 和 75°C 下经过 1000 小时的 1 太阳最大功率点跟踪后，效率分别保持了 96%和 88%。在-60°至+80°C 之间快速热循环的器件没有出现疲劳迹象，这表明有序偶极结构对钙钛矿太阳能电池的工作稳定性有影响。
