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Crystals 2019, 9(2), 83; https://doi.org/10.3390/cryst9020083

A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation

Department of Materials Science & Engineering, McMaster University, 1280 Main St W, L8S4L8, Canada
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Received: 17 January 2019 / Revised: 27 January 2019 / Accepted: 2 February 2019 / Published: 4 February 2019
(This article belongs to the Special Issue Advances in Thin Film Solar Cells)
PDF [1785 KB, uploaded 4 February 2019]

Abstract

Organic-inorganic hybrid halide perovskite solar cells (PSCs) have been a trending topic in recent years. Significant progress has been made to increase their power conversion efficiency (PCE) to more than 20%. However, the poor stability of PSCs in both working and non-working conditions results in rapid degradation through multiple environmental erosions such as water, heat, and UV light. Attempts have been made to resolve the rapid-degradation problems, including formula changes, transport layer improvements, and encapsulations, but none of these have effectively resolved the dilemma. This paper reports our findings on adding inorganic films as surface-passivation layers on top of the hybrid perovskite materials, which not only enhance stability by eliminating weak sites but also prevent water penetration by using a water-stable layer. The surface-passivated hybrid perovskite layer indicates a slight increase of bandgap energy (Eg=1.76 eV), compared to the original methylammonium lead iodide (MAPbI3, Eg=1.61 eV) layer, allowing for more stable perovskite layer with a small sacrifice in the photoluminescence property, which represents a lower charge diffusion rate and higher bandgap energy. Our finding offers an alternative approach to resolving the low stability issue for PSC fabrication.
Keywords: hybrid perovskite layer; surface/interface inorganic passivation; photoluminescence; moisture resistance; crystal structure hybrid perovskite layer; surface/interface inorganic passivation; photoluminescence; moisture resistance; crystal structure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tai, E.G.; Wang, R.T.; Chen, J.Y.; Xu, G. A Water-Stable Organic-Inorganic Hybrid Perovskite for Solar Cells by Inorganic Passivation. Crystals 2019, 9, 83.

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