Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, China.
State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, China.
Small Methods. 2023 Jul;7(7):e2201567. doi: 10.1002/smtd.202201567. Epub 2023 Apr 8.
The operation stability of halide perovskite devices is the critical issue that impedes their commercialization. The main reasons are that the ambient H O molecules can easily deteriorate the perovskites, while the metal electrodes react in different degrees with the perovskites. Herein, one kind of new electrode, the metalloids, is reported, which are much more stable than the conventional noble metals as electrical contacts for halide perovskites. The degradation mechanism of halide perovskites with noble metal electrodes is carefully studied and compared with the metalloid electrodes. It is found that the iodide ions can easily halogenate Cu and Ag in halide perovskites. Although Au is almost not halogenated, it can also decompose the perovskite film. On the contrary, after long-term storage, the metalloid electrodes remain intact on the perovskite film without any degradation. In addition, the long-time operation stability of the perovskite devices with metalloid electrodes is much higher than that of noble metals. First-principles calculations confirm the exceptional stability of the metalloid electrodes.This work explores the ultra-stable electrodes for halide perovskites, paving the way to the large-scale deployment of perovskite-based electronic devices.
卤化物钙钛矿器件的运行稳定性是阻碍其商业化的关键问题。主要原因是环境中的 H2O 分子很容易使钙钛矿恶化，而金属电极与钙钛矿的反应程度不同。在此，报道了一种新型电极——类金属，它比传统的贵金属作为卤化物钙钛矿的电接触更稳定。仔细研究了具有贵金属电极的卤化物钙钛矿的降解机制，并与类金属电极进行了比较。结果发现，卤化物钙钛矿中的碘离子很容易使 Cu 和 Ag 卤化。虽然 Au 几乎不被卤化，但它也可以分解钙钛矿薄膜。相反，经过长期储存，类金属电极在钙钛矿薄膜上保持完整，没有任何降解。此外，具有类金属电极的钙钛矿器件的长时间运行稳定性远高于贵金属。第一性原理计算证实了类金属电极的非凡稳定性。这项工作探索了卤化物钙钛矿的超稳定电极，为基于钙钛矿的电子器件的大规模部署铺平了道路。
