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Issue 12, 2016
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Vapor and healing treatment for CH3NH3PbI3−xClx films toward large-area perovskite solar cells

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Abstract

Hybrid methyl-ammonium lead trihalide perovskites are promising low-cost materials for use in solar cells and other optoelectronic applications. With a certified photovoltaic conversion efficiency record of 20.1%, scale-up for commercial purposes is already underway. However, preparation of large-area perovskite films remains a challenge, and films of perovskites on large electrodes suffer from non-uniform performance. Thus, production and characterization of the lateral uniformity of large-area films is a crucial step towards scale-up of devices. In this paper, we present a reproducible method for improving the lateral uniformity and performance of large-area perovskite solar cells (32 cm2). The method is based on methyl-ammonium iodide (MAI) vapor treatment as a new step in the sequential deposition of perovskite films. Following the MAI vapor treatment, we used high throughput techniques to map the photovoltaic performance throughout the large-area device. The lateral uniformity and performance of all photovoltaic parameters (Voc, Jsc, Fill Factor, Photo-conversion efficiency) increased, with an overall improved photo-conversion efficiency of ∼100% following a vapor treatment at 140 °C. Based on XRD and photoluminescence measurements, We propose that the MAI treatment promotes a “healing effect” to the perovskite film which increases the lateral uniformity across the large-area solar cell. Thus, the straightforward MAI vapor treatment is highly beneficial for large scale commercialization of perovskite solar cells, regardless of the specific deposition method.

Graphical abstract: Vapor and healing treatment for CH3NH3PbI3−xClx films toward large-area perovskite solar cells

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Supplementary files

Article information


Submitted
05 Dec 2015
Accepted
29 Dec 2015
First published
12 Jan 2016

Nanoscale, 2016,8, 6386-6392
Article type
Paper
Author version available

Vapor and healing treatment for CH3NH3PbI3−xClx films toward large-area perovskite solar cells

L. Gouda, R. Gottesman, S. Tirosh, E. Haltzi, J. Hu, A. Ginsburg, D. A. Keller, Y. Bouhadana and A. Zaban, Nanoscale, 2016, 8, 6386
DOI: 10.1039/C5NR08658B

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