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Issue 14, 2017
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Gold and iodine diffusion in large area perovskite solar cells under illumination

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Abstract

Operational stability is the main issue hindering the commercialisation of perovskite solar cells. Here, a long term light soaking test was performed on large area hybrid halide perovskite solar cells to investigate the morphological and chemical changes associated with the degradation of photovoltaic performance occurring within the devices. Using Scanning Transmission Electron Microscopy (STEM) in conjunction with EDX analysis on device cross sections, we observe the formation of gold clusters in the perovskite active layer as well as in the TiO2 mesoporous layer, and a severe degradation of the perovskite due to iodine migration into the hole transporter. All these phenomena are associated with a drastic drop of all the photovoltaic parameters. The use of advanced electron microscopy techniques and data processing provides new insights on the degradation pathways, directly correlating the nanoscale structure and chemistry to the macroscopic properties of hybrid perovskite devices.

Graphical abstract: Gold and iodine diffusion in large area perovskite solar cells under illumination

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Publication details

The article was received on 02 Feb 2017, accepted on 13 Mar 2017 and first published on 21 Mar 2017


Article type: Paper
DOI: 10.1039/C7NR00784A
Citation: Nanoscale, 2017,9, 4700-4706
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    Gold and iodine diffusion in large area perovskite solar cells under illumination

    S. Cacovich, L. Ciná, F. Matteocci, G. Divitini, P. A. Midgley, A. Di Carlo and C. Ducati, Nanoscale, 2017, 9, 4700
    DOI: 10.1039/C7NR00784A

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