Highly efficient inverted organic solar cells through material and interfacial engineering of indacenodithieno[3,2-b]thiophene-based polymers and devices

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Jeremy J. Intemann
  • Kai Yao
  • Yong-Xi Li
  • Hin-Lap Yip
  • Yun-Xiang Xu
  • Po-Wei Liang
  • Chu-Chen Chueh
  • Fei-Zhi Ding
  • Xi Yang
  • Xiaosong Li
  • Yiwang Chen

Detail(s)

Original languageEnglish
Pages (from-to)1465-1473
Journal / PublicationAdvanced Functional Materials
Volume24
Issue number10
Publication statusPublished - 12 Mar 2014
Externally publishedYes

Abstract

A synergistic approach combining new material design and interfacial engineering of devices is adopted to produce high efficiency inverted solar cells. Two new polymers, based on an indacenodithieno[3,2-b]thiophene- difluorobenzothiadiazole (PIDTT-DFBT) donor-acceptor (D-A) polymer, are produced by incorporating either an alkyl thiophene (PIDTT-DFBT-T) or alkyl thieno[3,2-b]thiophene (PIDTT-DFBT-TT) π-bridge as spacer. Although the PIDTT-DFBT-TT polymer exhibits decreased absorption at longer wavelengths and increased absorption at higher energy wavelengths, it shows higher power conversion efficiencies in devices. In contrast, the thiophene bridged PIDTT-DFBT-T shows a similar change in its absorption spectrum, but its low molecular weight leads to reduced hole mobilities and performance in photovoltaic cells. Inverted solar cells based on PIDTT-DFBT-TT are explored by modifying the electron-transporting ZnO layer with a fullerene self-assembled monolayer and the MoO3 hole-transporting layer with graphene oxide. This leads to power conversion efficiencies as high as 7.3% in inverted cells. PIDTT-DFBT-TT's characteristic strong short wavelength absorption and high efficiency suggests it is a good candidate as a wide band gap material for tandem solar cells. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • conjugated polymers, field-effect transistors, organic electronics, photovoltaic devices

Citation Format(s)

Highly efficient inverted organic solar cells through material and interfacial engineering of indacenodithieno[3,2-b]thiophene-based polymers and devices. / Intemann, Jeremy J.; Yao, Kai; Li, Yong-Xi; Yip, Hin-Lap; Xu, Yun-Xiang; Liang, Po-Wei; Chueh, Chu-Chen; Ding, Fei-Zhi; Yang, Xi; Li, Xiaosong; Chen, Yiwang; Jen, Alex K.-Y.

In: Advanced Functional Materials, Vol. 24, No. 10, 12.03.2014, p. 1465-1473.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal