What does this research mean for the field?

While coherent growth of GaN channels on AlN buffers on SiC substrates achieves record 2DEG mobility, relaxed GaN channels provide lower sheet and thermal resistance, creating a trade-off between thermal-electrical performance and misfit-induced degradation. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate the impact of coherent growth on the electrical and thermal properties of AlN/GaN HEMT heterostructures on SiC substrates.

May 20, 2026Applied Physics Letters

Coherently grown AlN/GaN HEMT heterostructures on AlN buffer on SiC substrate—Impact of coherent growth on electrical and thermal characteristics

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Authors

RLRavikiran LingaparthiNanyang Technological University YJYi JiangNational University of Singapore TSTian Long Alex SeahNanyang Technological University

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Implication

Randomized trial evaluates electrical and thermal characteristics in high-frequency devices, indicating growth impact.

Key Points

To investigate the impact of coherent growth on the electrical and thermal properties of AlN/GaN HEMT heterostructures on SiC substrates.
Achieved coherent growth of GaN channels on AlN buffers using AlGaN and superlattice-based stress transition layers.
Evaluated electron mobility and sheet resistance in different GaN channel configurations.
Achieved a 2DEG mobility of 626 cm2 V−1 s−1, the highest for a coherently grown GaN channel on AlN buffer on SiC.
Devices with relaxed GaN channels showed significantly lower sheet and thermal resistance than those with coherently strained channels.

Cite This Study

Lingaparthi et al. (2026) studied this question.

synapsesocial.com/papers/6a0d4f7bf03e14405aa9ac76 https://doi.org/10.1063/5.0318670

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Coherently grown AlN/GaN HEMT heterostructures on AlN buffer on SiC substrate—Impact of coherent growth on electrical and thermal characteristics

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Implication

Key Points

Cite This Study

Coherently grown AlN/GaN HEMT heterostructures on AlN buffer on SiC substrate—Impact of coherent growth on electrical and thermal characteristics

Discussion

Member takes

Implication

Key Points

Cite This Study

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