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Gold and iodine diffusion in large area perovskite solar cells under illumination.

Accepted version
Peer-reviewed

Type

Article

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Authors

Cacovich, S 
Ciná, L 
Matteocci, F 
Midgley, PA 

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.

Description

Keywords

0906 Electrical and Electronic Engineering, 1007 Nanotechnology

Journal Title

Nanoscale

Conference Name

Journal ISSN

2040-3364
2040-3372

Volume Title

9

Publisher

Royal Society of Chemistry (RSC)

Rights

All rights reserved
Sponsorship
European Research Council (291522)
European Research Council (259619)
European Research Council (291522), European Research Council (259619)