Improvement of Dynamic Performance and Detectivity in Near-Infrared Colloidal Quantum Dot Photodetectors by Incorporating Conjugated Polymersopen access
- Authors
- Kim, Myeong In; Kang, Jinhyeon; Park, Jaehee; Jeong, WonJo; Kim, Junho; Yim, Sanggyu; Jung, In Hwan
- Issue Date
- Nov-2022
- Publisher
- MDPI
- Keywords
- quantum-dot photodetector; conjugated polymers; hole-transporting polymers; dark current suppression; dynamic properties; near-infrared detection
- Citation
- MOLECULES, v.27, no.21, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- MOLECULES
- Volume
- 27
- Number
- 21
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/172885
- DOI
- 10.3390/molecules27217660
- ISSN
- 1420-3049
- Abstract
- Colloidal quantum dots (CQDs) have a unique advantage in realizing near-infrared (NIR) photodetection since their optical properties are readily tuned by the particle size, but CQD-based photodetectors (QPDs) presently show a high dark current density (J(d)) and insufficient dynamic characteristics. To overcome these two problems, we synthesized and introduced two types of conjugated polymers (CPs) by replacing the p-type CQD layer in the QPDs. The low dielectric constant and insulating properties of CPs under dark conditions effectively suppressed the J(d) in the QPDs. In addition, the energy-level alignment and high-hole mobility of the CPs facilitated hole transport. Therefore, both the responsivity and specific detectivity were highly enhanced in the CP-based QPDs. Notably, the dynamic characteristics of the QPDs, such as the -3 dB cut-off frequency and rising/falling response times, were significantly improved in the CP-based QPDs owing to the sizable molecular ordering and fast hole transport of the CP in the film state as well as the low trap density, well-aligned energy levels, and good interfacial contact in the CP-based devices.
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