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Stabilization of hybrid perovskite CH_3NH_3PbI_3 thin films by graphene passivation

Tseng, Wei-Shiuan and Jao, Meng-Huan and Hsu, Chen-Chih and Huang, Jing-Shun and Wu, Chih-I. and Yeh, N.-C. (2017) Stabilization of hybrid perovskite CH_3NH_3PbI_3 thin films by graphene passivation. Nanoscale, 9 (48). pp. 19227-19235. ISSN 2040-3364.

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We report the long-term stability of water-sensitive hybrid perovskites CH_3NH_3PbI_3 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 CH_3NH_3PbI_3 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 CH_3NH_3PbI_3 samples without graphene protection. This successful demonstration of the graphene-enabled passivation and long-term stability of CH_3NH_3PbI_3 thin films therefore opens up a new pathway towards realistic photovoltaic applications of hybrid perovskites.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Huang, Jing-Shun0000-0002-7531-4691
Yeh, N.-C.0000-0002-1826-419X
Alternate Title:Stabilization of hybrid perovskite CH3NH3PbI3 thin films by graphene passivation
Additional Information:© 2017 The Royal Society of Chemistry. Received 1st September 2017, Accepted 11th November 2017, First published on 13th November 2017. The work at Caltech was supported by the Grubstake Award. We thank Professor George Rossman for the use of his Raman spectrometer, and acknowledge the use of the XPS/UPS facilities at the Beckman Institute and the AFM and the four-point probe station in the Kavli Nanoscience Institute. W.-S. Tseng acknowledges the partial support from the Dragon Gate Program by the Ministry of Science and Technology in Taiwan, and M.-H. Jao acknowledges the partial support from the Office of Research and Development at the National Taiwan University. We also thank Yiliang Li for assisting in the measurements of the graphene sheet resistance. There are no conflicts to declare.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Caltech Grubstake FundUNSPECIFIED
Ministry of Science and Technology (Taipei)UNSPECIFIED
National Taiwan UniversityUNSPECIFIED
Issue or Number:48
Record Number:CaltechAUTHORS:20171130-100934420
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83593
Deposited By: Tony Diaz
Deposited On:30 Nov 2017 18:19
Last Modified:25 Feb 2020 19:27

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