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Title:
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The influence of the polymer architecture on morphology and device properties of polymer bulk heterojunction photovoltaic cells
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Author(s):
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Veenstra, S.C.; Kroon, J.M.; Koetse, M.M.; Sweelssen, J.; Franse, T.; Schoo, H.F.M.; Yang, X.; Loos, J.; Alexeev, A.; Schubert, U.S.
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Published by:
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Publication date:
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ECN
Solar Energy
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1-3-2004
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ECN report number:
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Document type:
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ECN-RX--04-018
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Article (scientific)
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Number of pages:
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10
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Published in: SPIE USE, V.6, 5215-22.Only available in PDF. (), , , Vol., p.-.
Abstract:
Polymer bulk hetero junction solar cells were made from poly(2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylenevinylene)
(MDMO-PPV) as donor and poly(cyanoetherphenylenevinylene) (PCNEPV) derivatives
as acceptor material. In this paper we start out with discussing the
synthesis of the materials. Subsequently, the main issues concerning
the devices are treated. Annealing the devices yielded devices with
encouraging efficiencies of 0.5% (1 sun, 100mW/cm
2),
as
calculated from the maximum power points (MPP). AFM studies revealed
that this anneal step improves especially the interface of the active
layer with the under laying PEDOT:PSS, although mobility and morphology
changes can not be ruled out. Lowering the molecular weight (Mw) of
the MDMO-PPV gave a slight improvement of the device performance. Decreasing
the Mw of the acceptor material, MDMO-PCNEPV (PCNEPV derivative with
the same side chains as MDMO-PPV) and optimizing the layer thickness
led to a device with an efficiency of 0.65%. Finally we looked into
the influence of the nature of the side chains on the acceptor polymer.
The results suggest that the closer the resemblance between donor and
acceptor is the better the device performance.
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