Evidence of Delocalization in Charge-Transfer State Manifold for Donor : Acceptor Organic Photovoltaics
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 21798-21805 |
Journal / Publication | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 33 |
Publication status | Published - 24 Aug 2016 |
Link(s)
Abstract
How charge-transfer states (CTSs) assist charge separation of a Coulombically bound exciton in organic photovoltaics has been a hot topic. It is believed that the delocalization feature of a CTS plays a crucial role in the charge separation process. However, the delocalization of the "hot" and the "relaxed" CTSs is still under debate. Here, with a novel frequency dependent charge-modulated electroabsorption spectroscopy (CMEAS) technique, we elucidate clearly that both "hot" and "relaxed" CTSs are loosely bound and delocalized states. This is confirmed by comparing the CMEAS results of CTSs with those of localized polaron states. Our results reveal the role of CTS delocalization on charge separation and indicate that no substantial delocalization gradient exists in CTSs.
Research Area(s)
- charge-modulated electroabsorption spectroscopy, charge-transfer states, delocalization, organic photovoltaics, polaron states
Citation Format(s)
Evidence of Delocalization in Charge-Transfer State Manifold for Donor : Acceptor Organic Photovoltaics. / Guan, Zhiqiang; Li, Ho-Wa; Zhang, Jinfeng; Cheng, Yuanhang; Yang, Qingdan; Lo, Ming-Fai; Ng, Tsz-Wai; Tsang, Sai-Wing; Lee, Chun-Sing.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 33, 24.08.2016, p. 21798-21805.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review