Effect of ZnO surface defects on efficiency and stability of ZnO-based perovskite solar cells

Fangzhou Liu; Man Kwong Wong; Ho Won Tam; Aleksandra B. Djurišić; Alan M. C. Ng; Wai Kin Chan

doi:10.1117/12.2251885

24 February 2017 Effect of ZnO surface defects on efficiency and stability of ZnO-based perovskite solar cells

Fangzhou Liu, Man Kwong Wong, Ho Won Tam, Aleksandra B. Djurišić, Alan M. C. Ng, Wai Kin Chan

Proceedings Volume 10105, Oxide-based Materials and Devices VIII; 101051F (2017) https://doi.org/10.1117/12.2251885
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

ZnO as an alternative electron transport layer (ETL) material for perovskite solar cell applications has drawn increasing research interest due to its comparable energy levels to TiO₂, relatively high electron mobility, as well as its feasibility to be processed at low temperatures for potential applications in flexible devices. Nevertheless, ZnO based perovskite devices usually exhibit inferior performance and severe stability drawbacks which are related to the surface defects of ZnO ETL. In this study, to investigate the correlation between ZnO defect composition and resulting device performance, different approaches of preparing ZnO ETL are compared in terms of the perovskite morphology and device performance. In addition, direct manipulations of ZnO surface defects are performed by various surface treatments, and the photovoltaic performance of devices with ZnO ETL subjected to different surface treatments is compared. Surface modification of ZnO ETL by ethanolamine (EA) is demonstrated to efficiently enhance the photovoltaic performance of resulting ZnO based devices.

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Citation Download Citation

Fangzhou Liu, Man Kwong Wong, Ho Won Tam, Aleksandra B. Djurišić, Alan M. C. Ng, and Wai Kin Chan "Effect of ZnO surface defects on efficiency and stability of ZnO-based perovskite solar cells", Proc. SPIE 10105, Oxide-based Materials and Devices VIII, 101051F (24 February 2017); https://doi.org/10.1117/12.2251885

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