Balance Between Light Absorption and Recombination Losses in Solution-Processed Small Molecule Solar Cells with Normal or Inverted Structures

Viktor V. Brus, Hang Ken Lee, Christopher M. Proctor, Michael Ford, Xiaofeng Liu, Mark A. Burgers, Jaechol Lee, Guillermo C. Bazan, Thuc Quyen Nguyen

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Comparison of the photovoltaic properties of F3:fullerene bulk heterojunction solar cells (where F3 is a donor molecule of intermediate dimensions) with normal and inverted structures as a function of photoactive layer thickness is carried out by using optical modeling and light-dependent photoelectrical characterization. The larger short circuit current of inverted devices can be explained by higher light absorption in the active layer, relative to normal devices. However, worse charge extraction conditions and trap-assisted recombination, in the bulk heterojunction blend in inverted devices, give rise to larger nongeminate recombination losses and an opposite thickness dependence of the short circuit current and fill factor than what is observed in counterparts with the conventional device architecture.

Original languageEnglish
Article number1801807
JournalAdvanced Energy Materials
Volume8
Issue number29
DOIs
Publication statusPublished - Oct 15 2018
Externally publishedYes

Keywords

  • charge transport
  • optical modeling
  • recombination losses
  • small molecules

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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