Title: Long‐Term Structural Evolution of an Intercalated Layered Semiconductor

Abstract

Intercalated molecules can dramatically modify the electronic band structure of layered semiconductors, significantly altering the optical properties of the material. In the layered monochalcogenide Gallium Telluride (GaTe), exposure to air induces a nearly 1 eV reduction of its band gap due to the interlayer diffusion and chemisorption of oxygen. The effect of oxygen chemisorption at the Te‐terminated surfaces on the structure of GaTe, however, is much less known. To better understand the structure–property relationship of intercalated GaTe, a systematic, long‐term, X‐ray diffraction study has been performed on GaTe exfoliated crystals exposed to ambient conditions. It is observed that the structural changes are not limited to a previously observed short‐term increase in lattice expansion. Over the course of months and even years after exfoliation, the oxygen adsorbates continue to modify the structure of GaTe, inducing significant disorder and grain reorientation. It is estimated that approximately one out of every two grains is slightly displaced by the intercalating oxygen, demonstrating a significant increase in grain mosaicity, while still maintaining the original {−2 0 1} out‐of‐plane texture. Correlating these structural transformations to observed changes in electrical and optical properties will enable capitalization of the use of adsorbates to engineer novel properties in thesemore » layered materials.« less

Authors:

Chew, Annabel R. ^[1]; Fonseca, Jose J. ^[2]; Dubon, Oscar D. ^[2]; Salleo, Alberto ^[1]

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+ Show Author Affiliations

1. Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA
2. Department of Materials Science and Engineering University of California Berkeley CA 94720 USA, Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Publication Date:

Wed Mar 01 00:00:00 EST 2017

Sponsoring Org.:

USDOE

OSTI Identifier:

1400616

Grant/Contract Number:  

DE‐AC02‐05CH11231

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Advanced Functional Materials

Additional Journal Information:

Journal Name: Advanced Functional Materials Journal Volume: 27 Journal Issue: 14; Journal ID: ISSN 1616-301X

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

Germany

Language:

English