Mr. Xiaoyu Yang Profile

Xiaoyu Yang

at Peking Univ

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Proceedings Article | 9 October 2021 Poster

Unveiling "buried secrets" in halide perovskite photovoltaics

Xiaoyu Yang, Rui Zhu

Proceedings Volume 11893, 118931C (2021) https://doi.org/10.1117/12.2600943

KEYWORDS: Perovskite, Interfaces, Photovoltaics, Spectroscopy, Spectroscopes, Solar cells, Photodetectors, Optoelectronics, Microscopy, Material characterization

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Understanding the fundamental properties of buried interfaces in perovskite photovoltaics is of paramount importance to the enhancement of device efficiency and stability. Studies to date have focused on the top surfaces of the polycrystalline perovskite films, yet non-radiative losses that hinder the power outputs are known to exist at the buried interfaces due to the accumulation of deep-level trap states. However, exploring these issues will become complex when the excess lead halide accumulates at the buried interface featuring non-exposed characteristics. In this work, the buried mysteries in full device stacks will be unveiled by a series of dedicated techniques including the lift-off strategy, the in-situ buried mapping spectroscopy, and the cross-sectional high-resolution microscopy. By establishing the microstructure–property relations, the basic losses at the contact interfaces are systematically presented, which are induced by both the sub-microscale extended imperfections and lead-halide inhomogeneities. Furthermore, an in-depth mechanism for the most popular ammonium-halide post-treatment is explored by exploiting time-related confocal spectroscopic imaging and materials characterizations. The surface ammonium halides could penetrate from the top surface to the bulk, especially the buried interface, and we called the molecule-assisted microstructural reconstruction. Both the bulk and interfacial losses can be considerably mitigated by the use of the passivation-molecule-assisted microstructural reconstruction, which unlocks the full potential for improving device performance. The methodology reported in this work is expected as the starting point to uncover the properties of the buried interfaces of various perovskite compositions and device structures for a broad range of applications including solar cells, light-emitting diodes, photodetectors, and other perovskite optoelectronics.

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