Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
ZnO nanorods are a good candidate for replacing standard photoanodes, such as TiO2, in perovskite solar cells and in principle superseding the high performances already obtained. This is possible because ZnO nanorods have a fast electron transport rate due to their large surface area. An array of ZnO nanorods is grown by chemical bath deposition starting from Al-doped ZnO (AZO) used both as a seed layer and as an efficient transparent anode in the visible spectral range. Recently it has also been shown that it is feasible to use AZO both as a TCO layer and as a seed layer for growth of ZnO nanorods in perovskite solar cells, by obtaining 3.62% in ambient air [1]. In this work we optimize the growth of ZnO nanorods on AZO by reaching a PCE of 7.0% in ambient air. We synthesize methylammonium lead iodide (CH3NH3PbI3) perovskite solar cells using AZO both as a transparent photoanode and as a seed for growth of ZnO nanorods by simplifying the standard architecture of the perovskite solar cell. ZnO nanorods are grown by chemical bath desposition and used as electron transport material. Considering that highly efficient perovskite solar cells are generally realized under a controlled or inert atmosphere, such as a glove box, it is important to emphasize that the devices realized in this study are not encapsulated and have been fabricated and characterized in ambient air. Despite the unfavorable conditions, we will show good stability of devices monitored over 20 days. A power conversion efficiency as high as 7.0% has been obtained by optimizing the growth process of nanorods. This is the highest reported value to the best of our knowledge and it is a promising result for the development of perovskite solar cells based on ZnO nanorods and AZO.
References
[1] Wang H, Yan L, Liu J, LiJ and Wang H 2016 Fabrication of well-aligned ZnO nanorod photoanodes for perovskite solar cells J. Mater. Sci., Mater. Electron. 27 6872–80
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