TITLE

Impedance spectroscopy investigation of electron transport in solar cells based on blend film of polymer and nanocrystals

AUTHOR(S)
Huang, Wenbo; Peng, Junbiao; Wang, Li; Wang, Jian; Cao, Yong
PUB. DATE
January 2008
SOURCE
Applied Physics Letters;1/7/2008, Vol. 92 Issue 1, p013308
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Bulk heterojunction solar cells, consisting of the active film of poly[2-methoxy,5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV) doped with cadmium selenium (CdSe) nanoparticles, were fabricated and investigated using impedance spectroscopy (IS) technique. The spectroscopy displayed a phenomenon of negative imaginary impedance (NII) related to the inductive effect in low frequencies in the device with low CdSe concentrations, and the NII phenomenon may disappear with increasing the CdSe concentrations. We propose an equivalent circuit to explain the IS and deduce that the NII phenomenon is related to inadequate channels for electron transport in the blend film of CdSe nanocrystals and MEH-PPV. The method based on the IS is available to probe the formation of a continuous network for electron transport in the nanocrystal dispersed polymer system.
ACCESSION #
28561129

 

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