Sun Meili, Shu Junfeng, Zhao Caixiang, Wu Jinpeng, Guo Haodan, Guo Yanjun, Yin Xiong, Lin Yuan, Tan Zhan'ao, He Meng, Wang Leyu
State Key Laboratory of Chemical Resource Engineering, Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
ACS Appl Mater Interfaces. 2022 Mar 23;14(11):13352-13360. doi: 10.1021/acsami.2c00388. Epub 2022 Mar 15.
The interfaces between the absorber and charge transport layers are shown to be critical for the performance of perovskite solar cells (PSCs). PSCs based on the Spiro-OMeTAD hole transport layers generally suffer from the problems of stability and reproducibility. Inorganic hole transport materials CuCrO have good chemical stability and high hole mobility. Herein, we reported the preparation of the delafossite-type CuCrO nanocrystals with a template-etching-calcination method and the incorporation of the as-obtained CuCrO nanocrystals at the perovskite/Spiro-OMeTAD interfaces of planar PSCs to improve the device efficiency and stability. Compared with the traditional hydrothermal method, the template-etching-calcination method used less calcination time to prepare CuCrO nanocrystals. After the CuCrO interface modification, the efficiency of PSCs improved from 18.08% to 20.66%. Additionally, the CuCrO-modified PSCs showed good stability by retaining nearly 90% of the initial PCE after being stored in a drybox for 30 days. The template-etching-calcination strategy will pave a new approach for the synthesis of high-performance inorganic hole-transporting materials.
吸收层与电荷传输层之间的界面对于钙钛矿太阳能电池（PSC）的性能至关重要。基于Spiro-OMeTAD空穴传输层的PSC通常存在稳定性和可重复性问题。无机空穴传输材料CuCrO具有良好的化学稳定性和高空穴迁移率。在此，我们报道了采用模板蚀刻煅烧法制备铜铁矿型CuCrO纳米晶体，并将所得CuCrO纳米晶体引入平面PSC的钙钛矿/Spiro-OMeTAD界面，以提高器件效率和稳定性。与传统水热法相比，模板蚀刻煅烧法制备CuCrO纳米晶体所需的煅烧时间更短。经过CuCrO界面修饰后，PSC的效率从18.08%提高到了20.66%。此外，经过CuCrO修饰的PSC在干燥箱中储存30天后，仍能保持近90%的初始光电转换效率，显示出良好的稳定性。模板蚀刻煅烧策略将为高性能无机空穴传输材料的合成开辟一条新途径。
