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<p>Photodetectors with no illumination must provide zero current for any voltage biasing. Recent experimental work in the literature (Goll et al. in IEEE Photonics J 15(2):1–6, 2023) proposes a new structure to delay the onset voltage of avalanche breakdown. The present authors (HTY) propose a new theory for the recent experimental work, focused on just before the onset of avalanche. The reverse bias of the photodetectors are explicitly considered with device doping information, and how much photon absorption is enhanced, while how much unwanted electron–hole pair recombination is suppressed. HTY consider the insulator in the new structure forces the device current path to go deeper into the bulk, and the longer path effectively suppresses the electric field, thus forcing a higher avalanche onset voltage. HTY further analyze the electric field by using energy band diagrams with quasi-Fermi levels, and also reinterpret the higher voltage as resulting from extra resistive elements, either lumped or distributed, in the equivalent circuit.</p>

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New lumped/distributed equivalent circuit based theory for avalanche breakdown suppressed reverse-bias PIN photodetectors

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Hidenori Yamada,
  • Toshishige Yamada

摘要

Photodetectors with no illumination must provide zero current for any voltage biasing. Recent experimental work in the literature (Goll et al. in IEEE Photonics J 15(2):1–6, 2023) proposes a new structure to delay the onset voltage of avalanche breakdown. The present authors (HTY) propose a new theory for the recent experimental work, focused on just before the onset of avalanche. The reverse bias of the photodetectors are explicitly considered with device doping information, and how much photon absorption is enhanced, while how much unwanted electron–hole pair recombination is suppressed. HTY consider the insulator in the new structure forces the device current path to go deeper into the bulk, and the longer path effectively suppresses the electric field, thus forcing a higher avalanche onset voltage. HTY further analyze the electric field by using energy band diagrams with quasi-Fermi levels, and also reinterpret the higher voltage as resulting from extra resistive elements, either lumped or distributed, in the equivalent circuit.