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Improving the Long-Term Stability of Perovskite Solar Cells with a Porous Al2O3 Buffer Layer

Guarnera, Simone, Abate, Antonio, Zhang, Wei, Foster, Jamie M., Richardson, Giles, Petrozza, Annamaria and Snaith, Henry J. (2015) Improving the Long-Term Stability of Perovskite Solar Cells with a Porous Al2O3 Buffer Layer The Journal of Physical Chemistry Letters, 6 (3). pp. 432-437.

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Hybrid perovskites represent a new paradigm for photovoltaics, which have the potential to overcome the performance limits of current technologies and achieve low cost and high versatility. However, an efficiency drop is often observed within the first few hundred hours of device operation, which could become an important issue. Here, we demonstrate that the electrode’s metal migrating through the hole transporting material (HTM) layer and eventually contacting the perovskite is in part responsible for this early device degradation. We show that depositing the HTM within an insulating mesoporous “buffer layer” comprised of Al2O3 nanoparticles prevents the metal electrode migration while allowing for precise control of the HTM thickness. This enables an improvement in the solar cell fill factor and prevents degradation of the device after 350 h of operation.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Guarnera, Simone
Abate, Antonio
Foster, Jamie M.
Richardson, Giles
Petrozza, Annamaria
Snaith, Henry J.
Date : 2015
DOI : 10.1021/jz502703p
Copyright Disclaimer : © 2015 American Chemical Society
Uncontrolled Keywords : Aging test; Buffer layer; Electric shunting pathway; Perovskite solar cells; Photovoltaic; Stability
Depositing User : Clive Harris
Date Deposited : 02 Jun 2017 11:52
Last Modified : 16 Jan 2019 18:53

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