Ultrawide bandgap semiconductor heterojunction p-n diodes with distributed polarization-doped p-type AlGaN layers on bulk AlN substrates

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Abstract

Ultrawide bandgap heterojunction p-n diodes with polarization-induced AlGaN p-type layers are demonstrated using plasma-assisted molecular beam epitaxy on bulk AlN substrates. Current-voltage characteristics show a turn-on voltage of V bi ≈ 5.5 V, a minimum room temperature ideality factor of η ≈ 1.63 , and more than 12 orders of current modulation at room temperature. A stable current operation of the ultrawide bandgap semiconductor diode is measured up to a temperature of 300 °C. The one-sided n+-p heterojunction diode design enables a direct measurement of the spatial distribution of polarization-induced mobile hole density in the graded AlGaN layer from the capacitance-voltage profile. The measured average mobile hole density is p ∼ 5.7 × 10 17 cm−3, in close agreement with what is theoretically expected from distributed polarization doping. Light emission peaked at 260 nm (4.78 eV) observed in electroluminescence corresponds to interband radiative recombination in the n+ AlGaN layer. A much weaker deep-level emission band observed at 3.4 eV is attributed to cation-vacancy and silicon complexes in the heavily Si-doped AlGaN layer. These results demonstrate that distributed polarization doping enables ultrawide bandgap semiconductor heterojunction p-n diodes that have wide applications ranging from power electronics to deep-ultraviolet photonics. These devices can operate at high temperatures and in harsh environments.

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Agrawal, S., van Deurzen, L., Encomendero, J., Dill, J. E., Wei (Sheena) Huang, H., Protasenko, V., … Jena, D. (2024). Ultrawide bandgap semiconductor heterojunction p-n diodes with distributed polarization-doped p-type AlGaN layers on bulk AlN substrates. Applied Physics Letters, 124(10). https://doi.org/10.1063/5.0189419

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