ZnO hybrid photovoltaics with variable side-chain lengths of thienothiophene polymer

Seungjin Han, Zhuping Fei, K.D.G. Imalka Jayawardena, Michail Beliatis, Yoon-Bong Hahn, A.A. Damitha T. Adikaari, Martin J. Heeney, S. Ravi P. Silva

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effect of the side-chain length of poly(3,6-dialkylthieno[3,2-b]thiophene-co-bithiophene) (pATBT) on the performance of hybrid polymer-metal oxide photovoltaics (PVs) utilizing zinc oxide (ZnO) acceptor is investigated.The pATBT attached with a dodecyl side chain (pATBT-C12) in hybrid photovoltaics with ZnO was compared topATBT with a hexadecyl side chain (pATBT-C16). Atomic force microscopic analysis reveals a smoother surface forthe pATBT-C16 photoactive layer compared to the pATBT-C12. For hybrid PVs using pATBT-C16, the relative intensity of the external quantum efficiency (EQE) increased particularly in wavelength region associated with the ZnO. Furthermore, the EQE spectrum shows a red shift for pATBT-C16 indicating better structural ordering compared to hybrid PVs with pATBT-C12. As a result, the hybrid PV utilizing pATBT-C16:ZnO blend layer is observed to display a better performance with a power conversion efficiency of 1.02% compared to 0.672% of pATBT-C12:ZnO PV.© 2014 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalThin Solid Films
Volume576
Pages (from-to)38–41
ISSN0040-6090
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Photovoltaic
  • Hybrid solar cells
  • Zinc oxide
  • Side-chain length
  • Thienothiophene

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