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Issue 48, 2017
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Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation

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Abstract

We report the long-term stability of water-sensitive hybrid perovskites CH3NH3PbI3 that were protected with 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 the studies of 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 showed 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 the graphene-enabled passivation and long-term stability of CH3NH3PbI3 thin films therefore opens up a new pathway towards realistic photovoltaic applications of hybrid perovskites.

Graphical abstract: Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation

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Supplementary files

Article information


Submitted
01 Sep 2017
Accepted
11 Nov 2017
First published
13 Nov 2017

Nanoscale, 2017,9, 19227-19235
Article type
Paper

Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation

W. Tseng, M. Jao, C. Hsu, J. Huang, Chih-I. Wu and N.-C. Yeh, Nanoscale, 2017, 9, 19227
DOI: 10.1039/C7NR06510H

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