Chemical trends of deep levels in van der Waals semiconductors

Penghong Ci, Xuezeng Tian, Jun Kang, Anthony Salazar, Kazutaka Eriguchi, Sorren Warkander, Kechao Tang, Jiaman Liu, Yabin Chen, Sefaattin Tongay, Wladek Walukiewicz, Jianwei Miao, Oscar Dubon and Junqiao Wu ()
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Penghong Ci: University of California
Xuezeng Tian: University of California
Jun Kang: Beijing Computational Science Research Center
Anthony Salazar: University of California
Kazutaka Eriguchi: University of California
Sorren Warkander: University of California
Kechao Tang: University of California
Jiaman Liu: University of California
Yabin Chen: University of California
Sefaattin Tongay: Transport, and Energy, Arizona State University
Wladek Walukiewicz: Lawrence Berkeley National Laboratory
Jianwei Miao: University of California
Oscar Dubon: University of California
Junqiao Wu: University of California

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Properties of semiconductors are largely defined by crystal imperfections including native defects. Van der Waals (vdW) semiconductors, a newly emerged class of materials, are no exception: defects exist even in the purest materials and strongly affect their electrical, optical, magnetic, catalytic and sensing properties. However, unlike conventional semiconductors where energy levels of defects are well documented, they are experimentally unknown in even the best studied vdW semiconductors, impeding the understanding and utilization of these materials. Here, we directly evaluate deep levels and their chemical trends in the bandgap of MoS2, WS2 and their alloys by transient spectroscopic study. One of the deep levels is found to follow the conduction band minimum of each host, attributed to the native sulfur vacancy. A switchable, DX center - like deep level has also been identified, whose energy lines up instead on a fixed level across different hosts, explaining a persistent photoconductivity above 400 K.

Date: 2020
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DOI: 10.1038/s41467-020-19247-1

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