Abstract
In this work, an AlGaN solar-blind ultraviolet separate-absorption-and-multiplication avalanche photodiode is presented, where the charge layer has a high-low-doping (HLD) profile and a lower Al content. It was shown by numerical simulations that the HLD not only improved the transport efficiency of holes crossing the charge layer, but also enhanced the electric fields in the multiplication region. Moreover, a lower Al-content charge layer may induce a polarization effect to further increase the electric fields in the multiplication layers, promoting the impact ionization in the multiplication region and decreasing the avalanche breakdown voltage. The HLD and heterostructure employed in the charge layer can also improve the photoresponse by enhancing the electric field and inducing the upward valence-band bending.
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Acknowledgments
This work is supported by the National Key Research and Development Project (Grant No. 2016YFB0400901), the State Key Program of the National Natural Science Foundation of China (Grant No. 61634002), Key Realm R&D Program of Guangdong Province, China (Grant No. 2019B010132004), and Guangdong Natural Science Foundation (Grant No. 2015A030312011).
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Zhang, Z., Sun, L., Chen, M. et al. Separate Absorption and Multiplication AlGaN Solar-Blind Avalanche Photodiodes With High-low-Doped and Heterostructured Charge Layer. J. Electron. Mater. 49, 2343–2348 (2020). https://doi.org/10.1007/s11664-020-07950-0
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DOI: https://doi.org/10.1007/s11664-020-07950-0