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Related Experiment Video

Updated: Feb 6, 2026

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Published on: November 15, 2013

Self-powered single semiconductor nanowire photodetector.

Shaili Sett¹, Subhamita Sengupta¹, N Ganesh²

¹Department of Condensed Matter and Material Sciences, S N Bose National Centre for Basic Sciences, JD Block, Sector 3, Salt Lake, Kolkata 7000106, India.

|August 15, 2018

Summary

This summary is machine-generated.

Self-powered photodetectors using germanium nanowires (NWs) achieve high photoresponse without external power. Asymmetric Schottky barrier heights create an internal field, separating photogenerated carriers for efficient detection.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Photodetectors are crucial for light sensing applications.
Self-powered devices eliminate the need for external voltage sources, simplifying designs.
Germanium nanowires offer unique electronic and optical properties for device fabrication.

Purpose of the Study:

To fabricate and characterize self-powered photodetectors using single germanium nanowires (NWs).
To investigate the mechanism responsible for the self-powered operation in metal-semiconductor-metal (MSM) devices.
To understand the role of Schottky barrier height (SBH) asymmetry in device performance.

Main Methods:

Fabrication of metal-semiconductor-metal (MSM) devices using single germanium nanowires.
Electrical characterization (I-V measurements) to analyze device behavior.
Device simulation to model the internal electric field and carrier transport.

Main Results:

The fabricated self-powered photodetectors exhibited high photoresponsivity (∼10³-10⁵ A W⁻¹) across a broad wavelength range (300-1100 nm).
I-V characteristics revealed asymmetry in the Schottky barrier heights (SBHs) at the two metal contacts.
Simulations confirmed that asymmetric SBHs generate a 'built-in' axial field, enabling efficient separation of photogenerated electron-hole pairs without an applied bias.

Conclusions:

Asymmetric Schottky barrier heights are the primary cause of self-powered operation in germanium nanowire photodetectors.
The 'built-in' axial field effectively separates photogenerated carriers, leading to high photoresponse.
Understanding the origins of unequal barrier heights is key for optimizing future self-powered photodetector designs.