Self-heating study of an AlGaN/GaN-based heterostructure field effect transistor using ultraviolet micro-Raman scattering.
- Texas Tech University, Lubbock, TX
We report micro-Raman studies of self-heating in an AlGaN/GaN heterostructure field-effect transistor using below (visible 488.0 nm) and near (UV 363.8 nm) GaN band-gap excitation. The shallow penetration depth of the UV light allows us to measure temperature rise ({Delta}T) in the two-dimensional electron gas (2DEG) region of the device between drain and source. Visible light gives the average {Delta}T in the GaN layer, and that of the SiC substrate, at the same lateral position. Combined, we depth profile the self-heating. Measured {Delta}T in the 2DEG is consistently over twice the average GaN-layer value. Electrical and thermal transport properties are simulated. We identify a hotspot, located at the gate edge in the 2DEG, as the prevailing factor in the self-heating.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 951717
- Report Number(s):
- SAND2005-0028J; TRN: US200913%%27
- Journal Information:
- Proposed for publication in Applied Physics Letters., Journal Name: Proposed for publication in Applied Physics Letters.
- Country of Publication:
- United States
- Language:
- English
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