Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Photo-Transistors Based on Bulk-Heterojunction Organic Semiconductors for Underwater Visible-Light Communications

가시광 수중 무선통신을 위한 이종접합 유기물 반도체 기반 고감도 포토트랜지스터 연구

  • Jeong-Min Lee (Department of Smart Green Technology Engineering, Pukyong National University) ;
  • Sung Yong Seo (Department of Chemistry, Pukyong National University) ;
  • Young Soo Lim (Department of Materials System Engineering, Pukyong National University) ;
  • Kang-Jun Baeg (Department of Smart Green Technology Engineering, Pukyong National University)
  • 이정민 (부경대학교 스마트그린기술융합공학과) ;
  • 서성용 (부경대학교 화학과) ;
  • 임영수 (부경대학교 신소재시스템전공) ;
  • 백강준 (부경대학교 스마트그린기술융합공학과)
  • Received : 2022.11.29
  • Accepted : 2022.12.06
  • Published : 2023.03.01
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Abstract

Underwater wireless communication is a challenging issue for realizing the smart aqua-farm and various marine activities for exploring the ocean and environmental monitoring. In comparison to acoustic and radio frequency technologies, the visible light communication is the most promising method to transmit data with a higher speed in complex underwater environments. To send data at a speedier rate, high-performance photodetectors are essentially required to receive blue and/or cyan-blue light that are transmitted from the light sources in a light-fidelity (Li-Fi) system. Here, we fabricated high-performance organic phototransistors (OPTs) based on P-type donor polymer (PTO2) and N-type acceptor small molecule (IT-4F) blend semiconductors. Bulk-heterojunction (BHJ) PTO2:IT-4F photo-active layer has a broad absorption spectrum in the range of 450~550 nm wavelength. Solution-processed OPTs showed a high photo-responsivity >1,000 mA/W, a large photo-sensitivity >103, a fast response time, and reproducible light-On/Off switching characteristics even under a weak incident light. BHJ organic semiconductors absorbed photons and generated excitons, and efficiently dissociated to electron and hole carriers at the donor-acceptor interface. Printed and flexible OPTs can be widely used as Li-Fi receivers and image sensors for underwater communication and underwater internet of things (UIoTs).

Keywords

Acknowledgement

이 논문은 2022학년도 부경대학교 국립대학육성사업 지원비에 의하여 연구되었음.

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