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<p>The extended spectral operation of graphene photodetector (GPD) under variation of incident radiation is a challenge in various applications. This paper is focused on spectral analysis of GPD under both dc and ac responses. GPD is used for surpassing other conventional detectors due to interband transition and lower thermo-generation rate. The spectral responsivity characteristic of GPDs is investigated under illuminated conditions. Moreover, the nontrivial influence of channel potential distribution is computed. Explicit analysis for estimation of photocurrent and the spectral responsivity are proposed. These analyses are concerned for improvement of GPD performances under ac and dc responses. Also, improvement of spectral responsivity through device parameters is a fundamental target of underlined detectors. These parameters are biasing voltage, temperature, number of graphene nanoribbon (GNR), channel length and characteristic velocity of electrons. The optimal performance of GPD is a primary goal in this manuscript. It is conducted that GPD can absorb radiation up to 100KeV with high performance. This device can be operated at much higher frequency of incident radiation with high speed. These results are compared with literature results and high agreement is demonstrated. The performance of GPD is improved under variation of incident radiation energy. Thus, GPD can surpass photomultiplier tube (PMT) within scintillator detectors. The proposed results confirm that GPD is an alternative instrument for detection of ionizing radiation.</p>

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Development of wide spectral graphene photodetectors instruments under illumination conditions

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Mohamed S. El-Tokhy,
  • Fayez Alfayez,
  • Wael M. Khedr,
  • Zaky Zaky

摘要

The extended spectral operation of graphene photodetector (GPD) under variation of incident radiation is a challenge in various applications. This paper is focused on spectral analysis of GPD under both dc and ac responses. GPD is used for surpassing other conventional detectors due to interband transition and lower thermo-generation rate. The spectral responsivity characteristic of GPDs is investigated under illuminated conditions. Moreover, the nontrivial influence of channel potential distribution is computed. Explicit analysis for estimation of photocurrent and the spectral responsivity are proposed. These analyses are concerned for improvement of GPD performances under ac and dc responses. Also, improvement of spectral responsivity through device parameters is a fundamental target of underlined detectors. These parameters are biasing voltage, temperature, number of graphene nanoribbon (GNR), channel length and characteristic velocity of electrons. The optimal performance of GPD is a primary goal in this manuscript. It is conducted that GPD can absorb radiation up to 100KeV with high performance. This device can be operated at much higher frequency of incident radiation with high speed. These results are compared with literature results and high agreement is demonstrated. The performance of GPD is improved under variation of incident radiation energy. Thus, GPD can surpass photomultiplier tube (PMT) within scintillator detectors. The proposed results confirm that GPD is an alternative instrument for detection of ionizing radiation.