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Stabilization of Hybrid Perovskite CH3NH3PbI3 Thin Films by Graphene Passivation

Abstract

We report long-term stability of water-sensitive hybrid perovskites CH3NH3PbI3 that were protected by monolayer graphene. This successful passivation was enabled by our development of a new water-free and polymer-free graphene transfer method. Monolayer graphene samples grown by plasma-enhanced chemical vapor deposition and transferred onto different substrates with the water/polymer-free method were found to preserve their high-quality characteristics after the transfer, as manifested by studied of the Raman, x-ray and ultraviolet photoemission spectroscopy (XPS and UPS), optical absorption, and sheet resistance. Additionally, XPS, UPS and optical absorption studies of fully graphene-covered CH3NH3PbI3 thin films exhibited spectral invariance even after 3 months, which was in sharp contrast to the drastic spectral changes after merely one week in control CH3NH3PbI3 samples without graphene protection. This successful demonstration of graphene-enabled passivation and long-term stability of CH3NH3PbI3 thin films therefore opens up a new pathway towards realistic photovoltaic applications of the hybrid perovskites.

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Publication details

The article was received on 01 Sep 2017, accepted on 11 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR06510H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Stabilization of Hybrid Perovskite CH3NH3PbI3 Thin Films by Graphene Passivation

    W. Tseng, M. Jao, C. Hsu, J. Huang, C. Wu and N.-C. Yeh, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06510H

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