美国西北大学Kanatzidis, Mercouri G.团队报道了二维钙钛矿增强钙钛矿太阳能电池的稳定性。相关研究成果发表在2024年7月8日出版的《自然》。

二维（2D）/三维（3D）钙钛矿异质结构在提高钙钛矿太阳能电池（PSCs）的性能方面发挥了关键作用。然而，阳离子在2D和3D层之间的迁移会导致八面体网络的破坏，随着时间的推移，导致性能下降。

假设钙钛矿具有通过边缘和表面共享实现的强大的有机-无机网络，可以阻碍离子迁移。研究人员探索了一组不同维度的钙钛矿，发现与2D/3D钙钛矿情况相比，钙钛矿/钙钛矿异质结构内的阳离子迁移受到抑制。当钙钛矿与3D钙钛矿表面接触时，增加其维度可以改善电荷传输——这是增强八面体连接性和平面外取向的结果。2D钙钛矿（A₆BfP）₈Pb₇I₂₂（A₆BffP:N-氨基己基-苯并[f]-邻苯二甲酰亚胺）提供了钙钛矿表面的有效钝化，并实现了均匀的大面积钙钛矿膜。

基于钙钛矿/钙钛矿异质结构的器件对于厘米面积的PSC，实现了24.6%的认证准稳态功率转换效率。对于封装的大面积器件，研究人员去除了脆弱的空穴传输层，并显示出下面的钙钛矿/钙钛矿异质结构，在空气环境中在85°C下稳定运行1250小时。

附：英文原文

Title: Two-dimensional Perovskitoids Enhance Stability in Perovskite Solar Cells

Author: Liu, Cheng, Yang, Yi, Chen, Hao, Spanopoulos, Ioannis, Bati, Abdulaziz S. R., Gilley, Isaiah W., Chen, Jianhua, Maxwell, Aidan, Vishal, Badri, Reynolds, Robert P., Wiggins, Taylor E., Wang, Zaiwei, Huang, Chuying, Fletcher, Jared, Liu, Yuan, Chen, Lin X., De Wolf, Stefaan, Chen, Bin, Zheng, Ding, Marks, Tobin J., Facchetti, Antonio, Sargent, Edward H., Kanatzidis, Mercouri G.

Issue&Volume: 2024-07-08

Abstract: Two-dimensional (2D)/three-dimensional (3D) perovskite heterostructures have played a key role in advancing the performance of perovskite solar cells (PSCs)1,2. However, the migration of cations between 2D and 3D layers results in the disruption of octahedral networks that leads to degradation in performance over time3,4. We hypothesized that perovskitoids, with robust organic-inorganic networks enabled by edge- and face-sharing, could impede ion migration. We explored a set of perovskitoids of varying dimensionality, and found that cation migration within perovskitoid/perovskite heterostructures was suppressed compared to the 2D/3D perovskite case. Increasing the dimensionality of perovskitoids improves charge transport when they are interfaced with 3D perovskite surfaces – this the result of enhanced octahedral connectivity and out-of-plane orientation. The 2D perovskitoid (A6BfP)8Pb7I22 (A6BfP: N-aminohexyl-benz[f]-phthalimide) provides efficient passivation of perovskite surfaces and enables uniform large-area perovskite films. Devices based on perovskitoid/perovskite heterostructures achieve a certified quasi-steady-state power conversion efficiency of 24.6% for centimeter-area PSCs. We removed the fragile hole transport layers and showed stable operation of the underlying perovskitoid/perovskite heterostructure at 85°C for 1,250 hours for encapsulated large-area devices in an air ambient.

DOI: 10.1038/s41586-024-07764-8

Source: https://www.nature.com/articles/s41586-024-07764-8