Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation. Issue 48 (30th November 2017)

• Record Type: Journal Article
• Authors: Tseng, Wei-Shiuan; Jao, Meng-Huan; Hsu, Chen-Chih; Huang, Jing-Shun; Wu, Chih-I.; Yeh, N.-C.
• Is Part Of: Nanoscale. Volume 9:Issue 48(2017)
• Page Start: 19227
• Page End: 19235
• Publication Date: 2017-11-30
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr06510h
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Long-term passivation of water-sensitive hybrid perovskites with monolayer graphene. Abstract : We report the long-term stability of water-sensitive hybrid perovskites CH3 NH3 PbI3 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 CH3 NH3 PbI3 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 CH3 NH3 PbI3 samples without graphene protection. This successful demonstration of the graphene-enabled passivation and long-term stability of CH3 NH3 PbI3 thin films therefore opens up a new pathway towards realistic photovoltaic applications of hybrid perovskites.