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Biasing of Metal-Semiconductor Junctions

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In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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2D Material light-emitting transistor with a dynamically controllable emission location for optimized waveguide

Chen Li1,2,3,4,5, Yongzhuo Li1,3,4,5, Yutong Zhong1,2,3,4,5

  • 1Department of Electronic Engineering, Tsinghua University, 100084 Beijing, China.

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|April 3, 2026
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Summary

Researchers developed a novel silicon-compatible light-emitting transistor using Molybdenum Ditelluride (MoTe2). This device offers electrically controlled light emission positioning and high efficiency, overcoming integration challenges for reconfigurable photonic circuits.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Two-dimensional semiconductors offer potential for silicon-compatible on-chip light sources.
  • Challenges exist in component performance, integration, and system architecture for nanoscale light sources.
  • Precise alignment of light sources with photonic components like waveguides is difficult.

Purpose of the Study:

  • To demonstrate a silicon-compatible Molybdenum Ditelluride (MoTe2) light-emitting transistor (LET).
  • To achieve dynamically reconfigurable light emission and electrical switching.
  • To overcome integration bottlenecks for reconfigurable photonic circuits.

Main Methods:

  • Fabrication of a silicon-compatible MoTe2 LET.
  • Utilizing a voltage-tunable dynamic p-i-n junction for electroluminescence (EL) positioning.
  • Integration of the LET with a silicon waveguide and grating couplers for light collection.

Main Results:

  • The LET demonstrated ambipolar transistor operation with a high on/off ratio (>10^5).
  • Electrically programmable EL positioning was achieved across a 15-micrometer channel.
  • A record electroluminescence efficiency of 67% was obtained with dynamic tuning and waveguide coupling.

Conclusions:

  • The developed MoTe2 LET enables electrically reconfigurable light emission and electrical switching.
  • Successful integration with silicon photonics overcomes critical alignment challenges.
  • This work paves the way for advanced reconfigurable silicon photonic circuits.