Influence of metal cathode for organic photovoltaic device performance

Influences of metal electrode on the performance of organic photovoltaic device were studied. An appropriate energy level was set between HOMO of donor material and LUMO of acceptor material used to fabricate device and metals with workfunction above, below and within this appropriate range were sel...

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Bibliographic Details
Published in:Synthetic metals 2009-09, Vol.159 (17-18), p.1910-1913
Main Authors: Eo, Yong Seok, Rhee, Hee Woo, Chin, Byung Doo, Yu, Jae-Woong
Format: Article
Language:English
Subjects:
Application fields
Applied sciences
Charge extraction
Energy
Exact sciences and technology
Metal electrode
Natural energy
Open circuit voltage
Organic photovoltaic
Photovoltaic conversion
Polymer industry, paints, wood
Series resistance
Solar cells. Photoelectrochemical cells
Solar energy
Technology of polymers
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Summary:Influences of metal electrode on the performance of organic photovoltaic device were studied. An appropriate energy level was set between HOMO of donor material and LUMO of acceptor material used to fabricate device and metals with workfunction above, below and within this appropriate range were selectively chosen to form electron collecting electrode. Metals which can form an Ohmic contact showed enhanced power conversion efficiency, while metals forming a Schottky type contact showed poor power conversion efficiency. Series resistances showed characteristic values for each range. Open circuit voltages were in the same order with power conversion efficiency, showing a dependence on injection barrier at negative electrode contact. The power conversion efficiency of low workfunction metal electrode (i.e. calcium electrode device) was higher than that of gold electrode where the electron extraction is spontaneous process.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2009.05.036