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Title: Correlation between charge transfer exciton recombination and photocurrent in polymer/fullerene solar cells

We correlate carrier recombination via charge transfer excitons (CTEs) with the short circuit current, J{sub sc}, in polymer/fullerene solar cells. Near infrared photoluminescence spectroscopy of CTE in three blends differing for the fullerene acceptor, gives unique insights into solar cell characteristics. The energetic position of the CTE is directly correlated with the open-circuit voltage, V{sub oc}, and more important J{sub sc} decreases with increasing CTE emission intensity. CTE emission intensity is discussed from the perspective of blend morphology. The work points out the fundamental role of CTE recombination and how optical spectroscopy can be used to derive information on solar cell performances.
Authors:
; ;  [1] ; ; ;  [2] ; ;  [3]
  1. Photonics and Optoelectronics Group, Department of Physics, CeNS Ludwig-Maximilians-University, 80799 Munich (Germany)
  2. Department of Organic Chemistry, Universidad Complutense de Madrid, 28040 Madrid (Spain)
  3. Institute of Physics, Energy and Semiconductor Research Laboratory, University of Oldenburg, 26111 Oldenburg (Germany)
Publication Date:
OSTI Identifier:
21367013
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 97; Journal Issue: 2; Other Information: DOI: 10.1063/1.3462298; (c) 2010 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHARGE EXCHANGE; ELECTRIC POTENTIAL; ELECTRICAL FAULTS; EXCITONS; FULLERENES; INFRARED SPECTRA; MORPHOLOGY; PHOTOCONDUCTIVITY; PHOTOEMISSION; PHOTOLUMINESCENCE; POLYMERS; RECOMBINATION; SOLAR CELLS; SPECTROSCOPY CARBON; DIRECT ENERGY CONVERTERS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; EMISSION; EQUIPMENT; LUMINESCENCE; NONMETALS; PHOTOELECTRIC CELLS; PHOTON EMISSION; PHOTOVOLTAIC CELLS; PHYSICAL PROPERTIES; QUASI PARTICLES; SECONDARY EMISSION; SOLAR EQUIPMENT; SPECTRA