Issue 48, 2017

Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation

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

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2017
Accepted
11 Nov 2017
First published
13 Nov 2017

Nanoscale, 2017,9, 19227-19235

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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