State Key Laboratory of Silicon Materials and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, China.
School of Engineering and Westlake Institute for Advanced Study, Westlake University, Hangzhou, China.
Nature. 2023 Aug;620(7973):323-327. doi: 10.1038/s41586-023-06208-z. Epub 2023 Jun 21.
The black phase of formamidinium lead iodide (FAPbI) perovskite shows huge promise as an efficient photovoltaic, but it is not favoured energetically at room temperature, meaning that the undesirable yellow phases are always present alongside it during crystallization. This problem has made it difficult to formulate the fast crystallization process of perovskite and develop guidelines governing the formation of black-phase FAPbI (refs. ). Here we use in situ monitoring of the perovskite crystallization process to report an oriented nucleation mechanism that can help to avoid the presence of undesirable phases and improve the performance of photovoltaic devices in different film-processing scenarios. The resulting device has a demonstrated power-conversion efficiency of 25.4% (certified 25.0%) and the module, which has an area of 27.83 cm, has achieved an impressive certified aperture efficiency of 21.4%.
黑相碘化甲脒铅钙钛矿（FAPbI）作为一种高效光伏材料极具前景，但在室温下其能量状态并不稳定，这意味着在结晶过程中总是会伴随生成不理想的黄相。这一问题使得钙钛矿的快速结晶过程难以被准确描述，也难以制定控制黑相 FAPbI 形成的指导方针（参考文献）。在此，我们通过原位监测钙钛矿结晶过程，报告了一种各向异性成核机制，该机制有助于避免生成不理想的相，并在不同薄膜加工条件下改善光伏器件的性能。由此制备的器件展示出 25.4%（经认证为 25.0%）的功率转换效率，其组件面积为 27.83cm，经认证的孔径效率达到了 21.4%，令人瞩目。
