센서학회지 (Journal of Sensor Science and Technology)

  • 제31권2호
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  • Pages.125-130
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  • 2022
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  • 1225-5475(pISSN)
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  • 2093-7563(eISSN)
한국센서학회 (The Korean Sensors Society)
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DOI QR Code

황화납 양자점 기반 단파장 적외선 수광소자의 전기적 특성 향상을 위한 산화아연 나노입자 농도의 중요성

Importance of Zinc Oxide Nanoparticle Concentration on the Electrical Properties of Lead Sulfide Quantum Dots-Based Shortwave Infrared Photodetectors

  • 서경호 (경북대학교 전자전기공학부) ;
  • 배진혁 (경북대학교 전자전기공학부)
  • Seo, Kyeong-Ho (School of Electronic and Electrical Engineering, Kyungpook National Unversity) ;
  • Bae, Jin-Hyuk (School of Electronic and Electrical Engineering, Kyungpook National Unversity)
  • 투고 : 2022.03.14
  • 심사 : 2022.03.30
  • 발행 : 2022.03.31
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초록

We describe the importance of zinc oxide nanoparticle (ZnO NP) concentration in the enhancement of electrical properties in a lead sulfide quantum dot (PbS QD)-based shortwave infrared (SWIR) photodetector. ZnO NPs were synthesized using the sol-gel method. The concentration of the ZnO NPs was controlled as 20, 30 and 40 mg/mL in this study. Note that the ZnO NPs layer is commonly used as an electron transport layer in PbS QDs SWIR photodetectors. The photo-to-dark ratio, which is an important parameter of a photodetector, was intensively examined to evaluate the electrical performance. The 20 mg/mL condition of ZnO NPs exhibited the highest photo-to-dark ratio value of 5 at -1 V, compared with 1.8 and 0.4 for 30 mg/mL and 40 mg/mL, respectively. This resulted because the electron mobility decreased when the concentration of ZnO NPs was higher than the optimized value. Based on our results, the concentration of ZnO NPs was observed to play an important role in the electrical performance of the PbS QDs SWIR photodetector.

키워드

과제정보

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (2021R1A2C1011429).

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