Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 19: Symposium 50 Jahre Solarzelle

HL 19.4: Vortrag

Dienstag, 9. März 2004, 16:45–17:15, H15

Material & Device Concepts for Organic Photovoltaics: Towards Competitive Efficiencies — •C. J. Brabec — SIEMENS AG, CT MM1, Innovative Polymers, Paul Gossenstr. 100, D-91052 Erlangen, Germany

The talk gives an overview on the technology of polymer photovoltaics, addressing device, production, packaging and business aspects. The focus is however placed on the function of bulk-heterojunction devices. Even 10 years after the introduction of the bulk-heterojunction concept, basic physical processes in these devices are still under discussion. A model to describe bulk heterojunction solar cells in introduced. The performance potential of state of the art organic bulk-heterojunction photovoltaic devices is analysed at the hand of this model, and guidelines towards higher device efficiencies are presented. The concept relies on the identification and determination of the relevant material parameters (lifetime, mobility, bandgap, trap density.....) for the pristine components and for the blended photovoltaic composites. Results from simulation are compared to experimental device performance. Based on these findings, material and device parameters for highly efficient bulk heterojunction devices are presented and a roadmap for the polymer photovoltaic is suggested.