TITLE

Electroluminescence in polymer-fullerene photovoltaic cells

AUTHOR(S)
Heejoo Kim; Jin Young Kim; Sung Heum Park; Kwanghee Lee; Youngeup Jin; Jinwoo Kim; Hongsuk Suh
PUB. DATE
May 2005
SOURCE
Applied Physics Letters;5/2/2005, Vol. 86 Issue 18, p183502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report electroluminescence (EL) in photovoltaic (PV) cells based on semiconducting polymer-fullerene composites. By applying a forward bias to the PV cells, the devices exhibited a clear EL action with a peak around 1.5 eV. We ascribe this peak to an “electric field-assisted exciplex” formed between the electrons in the fullerenes and the holes in the polymers, thereby resulting in radiative recombination in the composites. This finding is totally unexpected because of a strong photoluminescence quenching in the same materials. Since the same devices also showed typical photovoltaic effects under illumination, our results demonstrate a dual functionality in one device; polymer photovoltaic cells and polymer light-emitting diodes.
ACCESSION #
17164688

 

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