Key Laboratory of Flexible Electronics (KLoFE) and Institute of Advanced Materials (IAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, Jiangsu, China.
Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
Science. 2021 Mar 26;371(6536):1359-1364. doi: 10.1126/science.abf7652.
The stabilization of black-phase formamidinium lead iodide (α-FAPbI) perovskite under various environmental conditions is considered necessary for solar cells. However, challenges remain regarding the temperature sensitivity of α-FAPbI and the requirements for strict humidity control in its processing. Here we report the synthesis of stable α-FAPbI, regardless of humidity and temperature, based on a vertically aligned lead iodide thin film grown from an ionic liquid, methylamine formate. The vertically grown structure has numerous nanometer-scale ion channels that facilitate the permeation of formamidinium iodide into the lead iodide thin films for fast and robust transformation to α-FAPbI A solar cell with a power-conversion efficiency of 24.1% was achieved. The unencapsulated cells retain 80 and 90% of their initial efficiencies for 500 hours at 85°C and continuous light stress, respectively.
在各种环境条件下稳定黑相碘化甲脒铅钙钛矿（α-FAPbI）被认为是太阳能电池所必需的。然而，α-FAPbI 的温度敏感性以及其加工过程中严格湿度控制的要求仍然存在挑战。在这里，我们报告了一种基于垂直排列的碘化铅薄膜的稳定 α-FAPbI 的合成，该薄膜由离子液体甲脒甲酸甲酯生长而成。垂直生长的结构具有许多纳米级的离子通道，有利于甲脒碘化铯渗透到碘化铅薄膜中，从而快速、稳健地转化为α-FAPbI。一个功率转换效率为 24.1%的太阳能电池被实现了。未封装的电池在 85°C 和连续光照应力下分别保持其初始效率的 80%和 90%，持续 500 小时。
