Improving the long-term stability of perovskite solar cells with a porous Al2O3 buffer layer

Guarnera, Simone and Abate, Antonio and Zhang, Wei and Foster, Jamie M. and Richardson, Giles and 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. ISSN 1948-7185

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Abstract

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.

Keywords:Long-Term Stability, Perovskite Solar Cells, Porous Al2O3, Buffer Layer, JCNotOpen
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F110 Applied Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:22667
Deposited On:18 Mar 2016 15:10

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