Designing ternary blend bulk heterojunction solar cells with reduced carrier recombination and a fill factor of 77%

N. Gasparini, X. Jiao, T. Heumueller, D. Baran, G.J. Matt, S. Fladischer, E. Spiecker, H. Ade, C.J. Brabec, T. Ameri

Research output: Contribution to journalArticlepeer-review

Abstract

In recent years the concept of ternary blend bulk heterojunction (BHJ) solar cells based on organic semiconductors has been widely used to achieve a better match to the solar irradiance spectrum, and power conversion efficiencies beyond 10% have been reported. However, the fill factor of organic solar cells is still limited by the competition between recombination and extraction of free charges. Here, we design advanced material composites leading to a high fill factor of 77% in ternary blends, thus demonstrating how the recombination thresholds can be overcome. Extending beyond the typical sensitization concept, we add a highly ordered polymer that, in addition to enhanced absorption, overcomes limits predicted by classical recombination models. An effective charge transfer from the disordered host system onto the highly ordered sensitizer effectively avoids traps of the host matrix and features an almost ideal recombination behaviour. © 2016 Macmillan Publishers Limited. All rights reserved.
Original languageEnglish
JournalNature Energy
Volume1
Issue number9
DOIs
Publication statusPublished - 2016

Keywords

  • Charge transfer
  • Heterojunctions
  • Advanced materials
  • Bulk heterojunction (BHJ)
  • Bulk heterojunction solar cells
  • Carrier recombination
  • Enhanced absorption
  • Power conversion efficiencies
  • Recombination model
  • Solar irradiances
  • Organic solar cells

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