Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation
Journal
Nanoscale
Journal Volume
9
Journal Issue
48
Pages
19227-19235
Date Issued
2017
Author(s)
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. © 2017 The Royal Society of Chemistry.
SDGs
Other Subjects
Electromagnetic wave absorption; Graphene; Lead compounds; Light absorption; Monolayers; Passivation; Perovskite; Perovskite solar cells; Photoelectron spectroscopy; Plasma CVD; Plasma enhanced chemical vapor deposition; Vapor deposition; Water absorption; X ray photoelectron spectroscopy; Different substrates; Long term stability; Optical absorption studies; Photovoltaic applications; Spectral change; Spectral invariances; Transfer method; Ultraviolet photoemission spectroscopy; Thin films
Type
journal article