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Seok, Sang Il
Laboratory for Energy Harvesting Materials and Systems (LEHMS)
Research Interests
  • Solar energy conversion, perovskite solar cells, inorganic-organic hybrid materials and processing, solution chemistry

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Surface Engineering of Ambient-Air-Processed Cesium Lead Triiodide Layers for Efficient Solar Cells

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Title
Surface Engineering of Ambient-Air-Processed Cesium Lead Triiodide Layers for Efficient Solar Cells
Author
Yoon, So MeMin, HanulKim, Jong BeomKim, GwisuLee, Kyoung SuSeok, Sang Il
Issue Date
2021-01
Publisher
CELL PRESS
Citation
JOULE, v.5, no.1, pp.183 - 196
Abstract
Cesium lead triiodide (CsPbI3) presents a desirable band gap, does not require the use of mixed halides for Si tandem solar cells, and possesses relatively high thermal stability owing to its inorganic components. However, the power conversion efficiency ( PCE) of CsPbI3 is lower than that of organic cation-based halide perovskites with identical band gaps. The main factors that govern the PCE of CsPbI3 are the surface morphology and defect passivation of its thin films on substrates. In this study, we used the sequential dripping of a methylammonium chloride (MACl) solution (SDMS) to obtain highly uniform and pinhole- minimized thin films by controlling the intermediate stages of the crystallization process, followed by surface passivation using octylammonium iodides in ambient air. SDMS accelerated the crystallization process of the CsPbI3 perovskite layer, resulting in the formation of a uniform and dense surface with few pinholes. Consequently, we fabricated CsPbI3 solar cells with excellent PCE (20.37%).
URI
https://scholarworks.unist.ac.kr/handle/201301/52795
URL
https://www.sciencedirect.com/science/article/pii/S2542435120305663
DOI
10.1016/j.joule.2020.11.020
ISSN
2542-4351
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