Dark current reduction strategies using edge-on aligned donor polymers for high detectivity and responsivity organic photodetectors
- Authors
- Eom, Seung Hun; Nam, So Youn; Do, Hee Jin; Lee, Jaemin; Jeon, Sangho; Shin, Tae Joo; Jung, In Hwan; Yoon, Sung Cheol; Lee, Changjin
- Issue Date
- Jun-2017
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- POLYMER CHEMISTRY, v.8, no.23, pp.3612 - 3621
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMER CHEMISTRY
- Volume
- 8
- Number
- 23
- Start Page
- 3612
- End Page
- 3621
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/19612
- DOI
- 10.1039/c7py00497d
- ISSN
- 1759-9954
- Abstract
- We synthesized the conjugated polymers PT2OBT, PVT2OBT, and PFBT2OBT for use in organic photo-detecting devices. An octyloxy benzothiadiazole (OBT) moiety was used as a weak electron-accepting building block in the polymer system to cause the dominant absorption in the green-light region via weakening the intramolecular charge transfer (ICT) interactions between adjacent electron-donating moieties. In particular, indirect X-ray detection using a scintillator requires a low leakage current; thus, we focused on designing a molecular structure that can enhance the detectivity. The difluorobenzene-incorporated PFBT2OBT polymer showed a strong edge-on orientation both in the pristine film and in the blend film; however, PT2OBT and PVT2OBT have no preferred molecular orientation in the blend film. In the edge-on structure, the alkyl side chains of PFBT2OBT align on the surface of the electrode, forming an insulating layer, which decreases the tunneling leakage current, whereas in the latter cases, the interface between the semiconducting polymer backbone and PC70BM can come into contact with the electrode, forming a pathway for the leakage current. Consequently, the PFBT2OBT: PC70BM devices showed promising detectivities of over 10(13) Jones over a wide range of reverse biases of up to -2 V, resulting from their low dark current density of less than 2.3 x 10(-9) A cm(-2).
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 공과대학 > 서울 유기나노공학과 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/19612)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.