Boosting infrared light harvesting by molecular functionalization of metal oxide/polymer interfaces in efficient hybrid solar cells

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

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Author(s)

  • Giulia Grancini
  • R. Sai Santosh Kumar
  • Agnese Abrusci
  • Hin-Lap Yip
  • Chang-Zhi Li
  • Guglielmo Lanzani
  • Henry J. Snaith

Detail(s)

Original languageEnglish
Pages (from-to)2160-2166
Journal / PublicationAdvanced Functional Materials
Volume22
Issue number10
Publication statusPublished - 23 May 2012
Externally publishedYes

Abstract

Hybrid solar cells based on light absorbing semiconducting polymers infiltrated in nanocrystalline TiO 2 electrodes, have emerged as an attractive concept, combining benefits of both low material and processing costs with well controlled nano-scale morphology. However, after over ten years of research effort, power conversion efficiencies remain around 0.5%. Here, a spectroscopic and device based investigation is presented, which leads to a new optimization route where by functionalization of the TiO 2 surface with a molecular electron acceptor promotes photoinduced electron transfer from a low-band gap polymer(poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4- b0]dithiophene)-alt-4,7-(2,1,3-benzothiadia-zole)] (PCPDTBT) to the metal oxide. This boosts the infrared response and the power conversion efficiency to over 1%. As a further step, by "co-functionalizing" the TiO 2 surface with the electron acceptor and an organic dye-sensitizer, panchromatic spectral photoresponse is achieved in the visible to near-IR region. This novel architecture at the heterojunction opens new material design possibilities and represents an exciting route forward for hybrid photovoltaics. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • hybrid photovoltaic devices, low-band-gap polymer, polymer-metal oxide interfaces, spectral response, ultrafast spectroscopy

Citation Format(s)

Boosting infrared light harvesting by molecular functionalization of metal oxide/polymer interfaces in efficient hybrid solar cells. / Grancini, Giulia; Santosh Kumar, R. Sai; Abrusci, Agnese; Yip, Hin-Lap; Li, Chang-Zhi; Jen, Alex-K. Y.; Lanzani, Guglielmo; Snaith, Henry J.

In: Advanced Functional Materials, Vol. 22, No. 10, 23.05.2012, p. 2160-2166.

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