北京大学周欢萍团队报道了稳定高效的钙钛矿太阳能电池的晶圆级单层MoS₂薄膜集成。相关研究成果发表在2025年1月10日出版的《科学》。

钙钛矿太阳能电池（PSCs）商业化的主要挑战之一，是实现高功率转换效率（PCE）和足够的稳定性。

研究人员通过转移过程在钙钛矿层的顶部和底部，集成晶圆级连续单层MoS₂缓冲液。这些薄膜在物理上阻止了钙钛矿离子迁移到载流子传输层中，并通过强配位相互作用在化学上稳定了甲脒-碘化铅相。有效的化学钝化来自Pb-S键的形成，少数载流子通过I型带排列被阻断。

平面p-i-n PSCs（0.074平方厘米）和具有MoS₂/钙钛矿/MoS₂配置的模块（9.6平方厘米），分别实现了高达26.2%（经认证的稳态PCE为25.9%）和22.8%的PCE。此外，这些设备在湿热（85°C和85%相对湿度）下表现出优异的稳定性，1200小时后PCE损失<5%，在高温（85°C）下运行稳定性显著，1200小时后PCE损失<14%。

附：英文原文

Title: Wafer-scale monolayer MoS2 film integration for stable, efficient perovskite solar cells

Author: Huachao Zai, Pengfei Yang, Jie Su, Ruiyang Yin, Rundong Fan, Yuetong Wu, Xiao Zhu, Yue Ma, Tong Zhou, Wentao Zhou, Yu Zhang, Zijian Huang, Yiting Jiang, Nengxu Li, Yang Bai, Cheng Zhu, Zhaohui Huang, Jingjing Chang, Qi Chen, Yanfeng Zhang, Huanping Zhou

Issue&Volume: 2025-01-10

Abstract: One of the primary challenges in commercializing perovskite solar cells (PSCs) is achieving both high power conversion efficiency (PCE) and sufficient stability. We integrate wafer-scale continuous monolayer MoS2 buffers at the top and bottom of a perovskite layer through a transfer process. These films physically block ion migration of perovskite into carrier transport layers and chemically stabilize the formamidinium lead iodide phase through strong coordination interaction. Effective chemical passivation results from the formation of Pb-S bonds, and minority carriers are blocked through a type-I band alignment. Planar p-i-n PSCs (0.074 square centimeters) and modules (9.6 square centimeters) with MoS2/perovskite/MoS2 configuration achieve PCEs up to 26.2% (certified steady-state PCE of 25.9%) and 22.8%, respectively. Moreover, the devices show excellent damp heat (85°C and 85% relative humidity) stability with <5% PCE loss after 1200 hours and notable high temperature (85°C) operational stability with <4% PCE loss after 1200 hours.

DOI: ado2351

Source: https://www.science.org/doi/10.1126/science.ado2351