Evidence on Enhanced Exciton Polarizability in Donor/Acceptor Bulk Heterojunction Organic Photovoltaics
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 7256-7262 |
Journal / Publication | ACS Applied Materials and Interfaces |
Volume | 10 |
Issue number | 8 |
Online published | 6 Feb 2018 |
Publication status | Published - 28 Feb 2018 |
Link(s)
Abstract
Using electroabsorption spectroscopy, we explore the polarizability of Frenkel excitons in both pristine donor and D/A blend films. We observe for the first time that the polarizability of excitonic states in pristine donors can be dramatically increased by adding an n-type acceptor. By investigating the dielectric effect in different organic semiconductor systems, we find that the polarizability of Frenkel excitons has direct correlation with the measured dielectric constant of the bulk heterojunction thin films. Our results disclose the difference in the nature of Frenkel excitons in pristine donor and D/A blend systems, revealing an important role of excitonic states in charge separation process of organic photovoltaic devices.
Research Area(s)
- bulk heterojunction, electroabsorption, exciton, organic photovoltaic, polarizability
Citation Format(s)
Evidence on Enhanced Exciton Polarizability in Donor/Acceptor Bulk Heterojunction Organic Photovoltaics. / Guan, Zhiqiang; Li, Ho-Wa; Cheng, Yuanhang; Zhao, Yingqi; Lo, Ming-Fai; Tsang, Sai-Wing; Lee, Chun-Sing.
In: ACS Applied Materials and Interfaces, Vol. 10, No. 8, 28.02.2018, p. 7256-7262.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review