Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide

D. Shcherbakov, P. Stepanov, D. Weber, Y. Wang, J. Hu, Y. Zhu, K. Watanabe, T. Taniguchi, Z. Mao, W. Windl, J. Goldberger, M. Bockrath, C.N. Lau

Research output: Contribution to journalArticle

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Abstract

As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium tri-iodide is the latest addition to the family of two-dimensional (2D) materials. However, realistic exploration of CrI 3 -based devices and heterostructures is challenging due to its extreme instability under ambient conditions. Here, we present Raman characterization of CrI 3 and demonstrate that the main degradation pathway of CrI 3 is the photocatalytic substitution of iodine by water. While simple encapsulation by Al 2 O 3 , PMMA, and hexagonal BN (hBN) only leads to modest reduction in degradation rate, minimizing light exposure markedly improves stability, and CrI 3 sheets sandwiched between hBN layers are air-stable for >10 days. By monitoring the transfer characteristics of the CrI 3 /graphene heterostructure over the course of degradation, we show that the aquachromium solution hole-dopes graphene. \ 2018 American Chemical Society.
Original languageEnglish
Pages (from-to)4214-4219
Number of pages6
JournalNano letters
Volume18
Issue number7
DOIs
StatePublished - 2018

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