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Trap-induced losses in hybrid photovoltaics.

Authors
  • Gao, Feng
  • Li, Zhe
  • Wang, Jianpu
  • Rao, Akshay
  • Howard, Ian A
  • Abrusci, Agnese
  • Sylvain Massip
  • McNeill, Christopher R
  • Greenham, Neil C
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Apr 21, 2014
Volume
8
Issue
4
Pages
3213–3221
Identifiers
DOI: 10.1021/nn501185h
PMID: 24606110
Source
Medline
License
Unknown

Abstract

We investigate the loss mechanisms in hybrid photovoltaics based on blends of poly(3-hexylthiophene) with CdSe nanocrystals of various sizes. By combining the spectroscopic and electrical measurements on working devices as well as films, we identify that high trap-mediated recombination is responsible for the loss of photogenerated charge carriers in devices with small nanocrystals. In addition, we demonstrate that the reduced open-circuit voltage for devices with small nanocrystals is also caused by the traps.

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