Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Synthesis and Optoelectronic Characteristics of Ag2Se Nanoparticle for NIR Sensor Application

근적외선 센서를 위한 Ag2Se 나노 입자 합성 및 광전기적 특성

  • Jang, Jaewon (School of Electronics Engineering, Kyungpook National University)
  • 장재원 (경북대학교 IT 대학 전자공학부)
  • Received : 2019.07.25
  • Accepted : 2019.07.30
  • Published : 2019.07.31
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Abstract

In this study, $Ag_2Se$ nanoparticles were synthesized by employing the colloidal method. The synthesized $Ag_2Se$ nanocrystals were spherical in shape with a diameter of approximately 4 nm and had high crystallinity. These attributes of $Ag_2Se$ nanocrystals were determined through images obtained from a high resolution transmission electron microscope. Thin films comprising the synthesized $Ag_2Se$ nanoparticles had an optical band gap of 1.5 eV. Furthermore, fabricated NIR sensors comprising $Ag_2Se$ nanoparticles exhibited a high detectivity of $5.5{\times}10^9$ Jones (above $1{\times}10^9$) at room temperature, leading to low power consumption

Keywords

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Fig. 1. TEM images of synthesized Ag2Se nanoparticles

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Fig. 2. EDX spectrum taken from Ag2Se nanoparticles

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Fig. 3. XPS spectra of synthesized Ag2Se nanoparticles.

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Fig. 4. XRD patterns of Ag2Se films, annealed at 100 ℃ and annealed at 150 ℃.

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Fig. 5. (a) Absorbance and (b) (αhv)2 vs. hc curves of Ag2Se thin films

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Fig. 6. (a) The attained film thickness of Ag2Se films annealed at 150 ℃, as a function of the spin speed and (b) Transient photocurrent characteristics obtained for the Ag2Se based photodetector, as a function of film thicknesses.

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Fig. 7. The extracted representative parameters, corresponding to film thickness: (a) R, D and (b) G, S.

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