Wan Zhongquan, Wang Yuanxi, Lu Hui, Wei Runmin, Yin Haomiao, Zeng Huaibiao, Azam Muhammad, Luo Junsheng, Jia Chunyang
National Key Laboratory of Electronic Films and Integrated Devices, School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China 611731 Chengdu P. R. China
Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China 518110 Shenzhen P. R. China.
Chem Sci. 2024 Sep 11;15(40):16618-26. doi: 10.1039/d4sc04819a.
Despite the excellent performance of three-dimensional (3D) perovskite-based solar cells (PSCs), their poor stability under moisture and heating conditions limits their commercial application. To address this issue, a new pyreneammonium iodide (named TAPPyI), in which the pyrene-based compound 4,4',4'',4'''-(1,8-dihydropyrene-1,3,6,8-tetrayl)tetraaniline (named TAPPy) acts as the 2D cation, is introduced into 3D perovskite precursor solution for forming a 2D/3D heterostructured perovskite, which improves the quality of the perovskite film and enhances the stability of the perovskite film against moisture and heating. The planar pyrene endows TAPPyI with good charge transport properties, while the iodide on the arylamine side group effectively passivates the perovskite defects, thereby suppressing non-radiative recombination losses. Finally, the power conversion efficiency (PCE) of the TAPPyI-modified PSC is increased from 20.51% in the reference PSC to 22.73%. Furthermore, the stability of the TAPPyI-modified PSC is greatly improved, retaining 86% of the initial PCE after 360 hours in an environment of 85 °C and 85% humidity (ISOS-D-3), whereas the reference PSC only retains 2%. This work demonstrates that the conjugated planar molecule as a 2D cation to construct a 2D/3D heterostructured perovskite, which combines the good stability of 2D perovskite with the excellent carrier transport properties of 3D perovskite, can greatly enhance the efficiency and stability of PSCs.
尽管基于三维（3D）钙钛矿的太阳能电池（PSC）性能优异，但其在潮湿和加热条件下稳定性较差，限制了其商业应用。为解决这一问题，一种新的芘碘化铵（命名为TAPPyI）被引入到3D钙钛矿前驱体溶液中以形成2D/3D异质结构钙钛矿，其中基于芘的化合物4,4',4'',4'''-(1,8-二氢芘-1,3,6,8-四亚基)四苯胺（命名为TAPPy）作为二维阳离子。这提高了钙钛矿薄膜的质量，并增强了钙钛矿薄膜在防潮和加热方面的稳定性。平面芘赋予TAPPyI良好的电荷传输性能，而芳胺侧基上的碘化物有效地钝化了钙钛矿缺陷，从而抑制了非辐射复合损失。最后，TAPPyI修饰的PSC的功率转换效率（PCE）从参考PSC的20.51%提高到了22.73%。此外，TAPPyI修饰的PSC的稳定性大大提高，在85℃和85%湿度的环境中（ISOS-D-3）放置360小时后仍保留初始PCE的86%，而参考PSC仅保留2%。这项工作表明，共轭平面分子作为二维阳离子构建2D/3D异质结构钙钛矿，将二维钙钛矿的良好稳定性与三维钙钛矿的优异载流子传输性能相结合，可以大大提高PSC的效率和稳定性。
