Optical characterization of the hole polaron in a series of diketopyrrolopyrrole polymers used for organic photovoltaics

Evan L. Williams, Ter Shien Ang, Zien Ooi, Prashant Sonar, Ting Ting Lin, Wei Teng Neo, Jing Song, Jonathan Hobley

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

A strategy that is often used for designing low band gap polymers involves the incorporation of electron-rich (donor) and electron-deficient (acceptor) conjugated segments within the polymer backbone. In this paper we investigate such a series of Diketopyrrolopyrrole (DPP)-based co-polymers. The co-polymers consisted of a DPP unit attached to a phenylene, naphthalene, or anthracene unit. Additionally, polymers utilizing either the thiophene-flanked DPP or the furan-flanked DPP units paired with the naphthalene comonomer were compared. As these polymers have been used as donor materials and subsequent hole transporting materials in organic solar cells, we are specifically interested in characterizing the optical absorption of the hole polaron of these DPP based copolymers. We employ chemical doping, electrochemical doping, and photoinduced absorption (PIA) studies to probe the hole polaron absorption spectra. While some donor-acceptor polymers have shown an appreciable capacity to generate free charge carriers upon photoexcitation, no polaron signal was observed in the PIA spectrum of the polymers in this study. The relations between molecular structure and optical properties are discussed.

原文English
頁(從 - 到)69-90
頁數22
期刊Polymers
7
發行號1
DOIs
出版狀態Published - 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics

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