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Proceedings Paper

Influence of the polymer architecture on morphology and device properties of polymer bulk heterojunction photovoltaic cells
Author(s): Marc Koetse; Jorgen Sweelssen; Tom Franse; Sjoerd Veenstra; Jan Kroon; Xiaoniu Yang; Alexander Alexeev; Joachim Loos; Ulrich Schubert; Herman Schoo
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Paper Abstract

Polymer bulk hetero junction solar cells were made from poly(2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylene-vinylene) (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/cm2), 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.

Paper Details

Date Published: 6 February 2004
PDF: 10 pages
Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); doi: 10.1117/12.504513
Show Author Affiliations
Marc Koetse, TNO Institute of Industrial Technology (Netherlands)
Jorgen Sweelssen, TNO Institute of Industrial Technology (Netherlands)
Tom Franse, TNO Institute of Industrial Technology (Netherlands)
Sjoerd Veenstra, Energy Research Ctr. of the Netherlands (Netherlands)
Jan Kroon, Energy Research Ctr. of the Netherlands (Netherlands)
Xiaoniu Yang, Technische Univ. Eindhoven (Netherlands)
Alexander Alexeev, Technische Univ. Eindhoven (Netherlands)
Joachim Loos, Technische Univ. Eindhoven (Netherlands)
Ulrich Schubert, Technische Univ. Eindhoven (Netherlands)
Herman Schoo, TNO Institute of Industrial Technology (Netherlands)


Published in SPIE Proceedings Vol. 5215:
Organic Photovoltaics IV
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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