Influence of the polymer architecture on morphology and device properties of polymer bulk heterojunction photovoltaic cells

Marc Koetse; Jorgen Sweelssen; Tom Franse; Sjoerd Veenstra; Jan Kroon; Xiaoniu Yang; Alexander Alexeev; Joachim Loos; Ulrich Schubert; Herman Schoo

doi:10.1117/12.504513

6 February 2004 Influence of the polymer architecture on morphology and device properties of polymer bulk heterojunction photovoltaic cells

Marc Koetse, Jorgen Sweelssen, Tom Franse, Sjoerd Veenstra, Jan Kroon, Xiaoniu Yang, Alexander Alexeev, Joachim Loos, Ulrich Schubert, Herman Schoo

Author Affiliations +

Proceedings Volume 5215, Organic Photovoltaics IV; (2004) https://doi.org/10.1117/12.504513
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

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Marc Koetse, Jorgen Sweelssen, Tom Franse, Sjoerd Veenstra, Jan Kroon, Xiaoniu Yang, Alexander Alexeev, Joachim Loos, Ulrich Schubert, and Herman Schoo "Influence of the polymer architecture on morphology and device properties of polymer bulk heterojunction photovoltaic cells", Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004); https://doi.org/10.1117/12.504513

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