Ultrafast decay of hot phonons in an AlGaN/AlN/AlGaN/GaN camelback channel

J. H. Leach; M. Wu; H. MorkocJ. LiberisE. SermuksnisM. RamonasA. Matulionis

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Ultrafast decay of hot phonons in an AlGaN/AlN/AlGaN/GaN camelback channel

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A bottleneck for heat dissipation from the channel of a GaN-based heterostructure field-effect transistor is treated in terms of the lifetime of nonequilibrium (hot) longitudinal optical phonons, which are responsible for additional scattering of electrons in the voltage-biased quasi-two-dimensional channel. The hot-phonon lifetime is measured for an Al_(0.33)Ga_(0.67)N/AlN/Al_(0.1)Ga_(0.9)N/GaN heterostructure where the mobile electrons are spread in a composite Al_(0.1)Ga_(0.9)N/GaN channel and form a camelback electron density profile at high electric fields. In accordance with plasmon-assisted hot-phonon decay, the parameter of importance for the lifetime is not the total charge in the channel (the electron sheet density) but rather the electron density profile. This is demonstrated by comparing two structures with equal sheet densities (1 X 10~(13) cm~(-2)), but with different density profiles. The camelback channel profile exhibits a shorter hot-phonon lifetime of approx270 fs as compared with approx500 fs reported for a standard Al_(0.33)Ga_(0.67)N/AlN/GaN channel at low supplied power levels. When supplied power is sufficient to heat the electrons >600 K, ultrafast decay of hot phonons is observed in the case of the composite channel structure. In this case, the electron density profile spreads to form a camelback profile, and hot-phonon lifetime reduces to approx50 fs.

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《Journal of Applied Physics》 |2011年第10期|104504-1-104504-6|共6页
作者
J. H. Leach; M. Wu; H. MorkocJ. LiberisE. SermuksnisM. RamonasA. Matulionis;
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作者单位

Semiconductor Physics Institute of Center for Physical Science and Technology, Vilnius 01108, Lithuania;

Virginia Commonwealth University, Richmond, Virginia 23284, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种英语
中图分类应用物理学;
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Ultrafast decay of hot phonons in an AlGaN/AlN/AlGaN/GaN camelback channel

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