High-Performance Photomultiplication Photodiode with a 70 nm-Thick Active Layer Assisted by IDIC as an Efficient Molecular Sensitizer
- Authors
- Neethipathi, Deepan Kumar; Ryu, Hwa Sook; Jang, Min Su; Yoon, Seongwon; Sim, Kyu Mm; Woo, Han Young; Chung, Dae Sung
- Issue Date
- 12-6월-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- polymer photodetector; photomultiplication; nonfullerene acceptor; detectivity; external quantum efficiency
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.11, no.23, pp.21211 - 21217
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 11
- Number
- 23
- Start Page
- 21211
- End Page
- 21217
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/64775
- DOI
- 10.1021/acsami.9b01090
- ISSN
- 1944-8244
- Abstract
- Here, a smart strategy for decreasing the active layer thickness of the organic photodiode down to 70 nm is demonstrated by utilizing a trap-assisted photomultiplication mechanism with the optimized chemical composition. Despite the presence of a high dark current, dramatically enhanced external quantum efficiency (EQE) via photomultiplication can allow significantly reduced active layer thickness, yielding high detectivity comparable to that of conventional Si. To achieve this, a spatially confined and electrically isolated optical sensitizer, 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b'] dithiophene-2,7-diyl)bis(methanylylidene))bis (3-oxo-2,3-dihydro-1H-indene-2,1-diylidene)) dimalononitrile (IDIC) was introduced strategically between a hole transport active layer and a cathode. A nonfullerene acceptor, IDIC, turned out to be a much more efficient sensitizer than the conventional fullerene-based acceptors, as confirmed by the effective lowering of the Schottky barrier under illumination, as well as the highest EQE exceeding 130 000%. Due to its favorable electronic structure as well as two-dimensional molecular structure, a high detectivity over 10(12) Jones was successfully demonstrated while maintaining the active layer thickness as 70 nm.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Science > Department of Chemistry > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.