Cascade ZnO-ZnS electron transport layer for high-performance perovskite solar cells and modules
Ruihao Chen a, Jing Li a, Nanfeng Zheng a
a Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Poster, Ruihao Chen, 052
Publication date: 4th December 2020

Although perovskite solar cells (PSCs) have reached certified efficiency up to 25.5%, the moisture instability and unscalable fabrication protocols are still unsolved and blocking their further commercialization. Here, a new cascade ZnO-ZnS electron transport layer with scalable depositing ability is developed to solve those shortcomings towards the efficient PSCs and modules. The surface ZnS, which was converted from ZnO by sulfidation, would chemically passivate the surface of ZnO electron transport layer (ETL), and effectively inhibit the deprotonation and degradation of the perovskite layer based on ZnO ETL. In addition, the sulfide on ZnO-ZnS surface binds strongly with Pb2+ ions and consequently creates a novel tunnel of electron transport to accelerate electron transfer and reduce interfacial charge recombination. Thus, PSCs based on this novel ETL yield a champion efficiency of 20.7% (0.1 cm2) with improved stability and no appreciable hysteresis.[1] Finally, corresponding large-area (16 cm2) modules were achieved by scalable blade-coating with best‐efficiency up to 15.8%.[2] Our cells and modules based on ZnO-ZnS ETL maintained about 90% of their initial efficiency after 1,000 h at a relative humidity of 40%.

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