Optoelectronic properties of tungsten disulfide nanotube p-n junctions

ORAL

Abstract

Due to their favorable and rich electronic and optical properties, group-VI-B transition-metal dichalcogenides (TMDs) have attracted considerable interest. They have earned their position in the materials portfolio of the spintronics and valleytronics communities. The electrical performance of TMDs is enhanced by rolling up the two-dimensional (2D) sheets to form quasi-one-dimensional (1D) tubular structures. The fabrication of p-n junctions out of these tubular TMDs would boost their potential for optoelectronic devices as such junctions represent a fundamental building block. Here, we report the realization of a p-n junction out of a single, isolated WS2-nanotube (WS2-NT). Light-emitting diode operation and photovoltaic behavior were observed based on such p-n junctions. The emitted light as well as the photovoltaic effect exhibit strong linear polarization characteristics due to the quasi-1D nature. The external quantum efficiency for the photovoltaic effect reaches a value as high as 4.8 %, exceeding by far that of 2D TMDs and even approaching the internal quantum efficiency of the 2D TMDs. This efficiency improvement indicates that TMD nanotubes are superior candidates over 2D TMDs for optoelectronic applications.

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Presenters

  • Yijin Zhang

    Max Planck Institute for Solid State Research

Authors

  • Yijin Zhang

    Max Planck Institute for Solid State Research

  • Masaru Onga

    University of Tokyo, Univ. of Tokyo

  • Feng Qin

    The University of Tokyo, University of Tokyo

  • Wu Shi

    Lawrence Berkeley National Laboratory, Physics, University of California, Berkeley, Univ of California - Berkeley

  • Alla Zak

    Holon Institute of Technology, Holen Institute of Technology

  • Reshef Tenne

    Materials and Interfaces Department, Weizmann Institute of Science, Weizmann Institute of Science

  • Jurgen Smet

    Max Planck Institute for Solid State Research, Max Planck Insitute for Solid State Research

  • Yoshihiro Iwasa

    Univ of Tokyo, Department of Applied Physics, The University of Tokyo, The University of Tokyo, University of Tokyo, The Univ. of Tokyo, the University of Tokyo, the Univ. of Tokyo, Univ. of Tokyo