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

8 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)21798-21805
Journal / PublicationACS Applied Materials and Interfaces
Volume8
Issue number33
Publication statusPublished - 24 Aug 2016

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