# Ultrahigh Gain Diamond Deep-ultraviolet Photodetector Due to Surface Hydrogen Termination and Deep defects 

https://mdr.nims.go.jp/datasets/eead8179-fc80-4c7e-8d0f-dc0652f282b1

## File

- [NDNC2025_abstract_photodetector Gu.docx](https://mdr.nims.go.jp/filesets/bf207b70-8eed-4bee-bf2c-9cf060582782/download) ([Detail](https://mdr.nims.go.jp/filesets/bf207b70-8eed-4bee-bf2c-9cf060582782.md))

## Id

eead8179-fc80-4c7e-8d0f-dc0652f282b1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-05-17T02:14:09.097301Z

## Updated at

2025-05-21T23:30:29.255930Z

## Published at

2025-05-21T23:23:10.367916Z

## Doi

https://doi.org/10.48505/nims.5492

## First published url



## Date published



## Recorded date published



## Resource type

conference_poster

## Manuscript type

na

## Collection



## Title

- title: 'Ultrahigh Gain Diamond Deep-ultraviolet Photodetector Due to Surface Hydrogen
    Termination and Deep defects '
  title_type: original
  lang: en

## Description

- description: Herein, we demonstrate that the ultra-high quantum efficiency/gain
    DUV photodetectors (PDs) with low operation voltages (<5 V) can be achieved by
    using the synergistic effect of surface states and deep defects in a type-Ib single-crystal
    diamond (SCD) substrate, as shown in Figure 1. The overall photoresponse, such
    as the responsivity, dark current, spectral selectivity, and response speed, of
    the diamond DUV-PDs can be simply tailored by the surface hydrogen or oxygen termination
    of the diamond containing deep nitrogen defect. The DUV responsivity and external
    quantum efficiency (EQE) are more than 2.5x104A/W and 1.4x107%, respectively,
    at 220 nm-wavelength light, the highest among the DUV detectors and comparable
    with those of PMTs. The DUV/visible light rejection ratio (R220 nm/R400 nm) is
    as high as 6.7×105. The depletion of the two-dimensional hole gas on the hydrogen-terminated
    diamond surface by deep nitrogen defect provides a low background dark current
    and the filling of the ionized nitrogen upon DUV illumination induces a huge photocurrent.
    The synergistic effect of the surface states and the bulk deep defects opens the
    avenue for the development of DUV detectors with ultra-high sensitivity and low
    operation voltages compatible with integrated circuits.
  description_type: abstract
  lang: eng

## Creator

- name: Keyun Gu
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Functional Materials
    Field/Ultra-wide Bandgap Semiconductors Group
- name: Zilong Zhang
  role: author
  orcid: https://orcid.org/0000-0002-9759-9253
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Functional Materials
    Field/Ultra-wide Bandgap Semiconductors Group
- name: Jian Huang
  role: author
  organization: Shanghai University
- name: Yasuo Koide
  role: author
  orcid: https://orcid.org/0000-0001-8321-9822
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Functional Materials
    Field/Next-generation Semiconductor Group
- name: Meiyong Liao
  role: author
  orcid: https://orcid.org/0000-0003-1361-4266
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Functional Materials
    Field/Ultra-wide Bandgap Semiconductors Group

## Contact agent



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## Keyword

- subject: Diamond
  schema: not_defined
- subject: photodetector
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: The 18th International Conference on New Diamond and Nano Carbons
start_date: 2025-05-11
end_date: 2025-05-15
identifier: https://ndnc2025.org/index.html

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## Instrument



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## Measurement method



## Specimen



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## Fileset

- id: bf207b70-8eed-4bee-bf2c-9cf060582782
  filename: NDNC2025_abstract_photodetector Gu.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 214840
  md5: 7241bce9bfb5091aafd8b52801b8bb35

## Thumbnail

fileset_id: bf207b70-8eed-4bee-bf2c-9cf060582782
filename: NDNC2025_abstract_photodetector Gu.docx