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Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.47: Poster

Thursday, March 14, 2013, 17:00–20:00, Poster B2

Spatially-resolved measurements of charge carrier lifetimes in CdTe solar cells — •Martin Krauße1, Christian Kraft1, Hannes Hempel1, Volker Buschmann2, Torsten Siebert2, Christoph Heisler1, Werner Wesch1, and Carsten Ronning11Friedrich-Schiller-Universität Jena, Physikalisch-Astronomische Fakultät, Max-Wien-Platz 1, 07743 Jena, Germany — 2PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany

The lifetime of the minority charge carriers in polycrystalline Cadmium Telluride (pc-CdTe) for solar cell applications is a crucial material parameter and has been determined by analysis of the decay curves of the luminescence signal. Both the lateral and transversal distribution of the carrier lifetime on the surface and in the bulk of pc-CdTe material as well as the respective solar cell characteristics were measured as a function of the deposition technique, the activation treatment and the incorporation of additional group-V elements. The results are compared to prior studies.
It was found, that an activation process passivates grain boundaries and increases the carrier lifetime, which is then higher at the pn-junction than at the surface. Furthermore, nitrogen and phosphorus doping of the CdTe absorber material influences the charge carrier lifetime. The results show that the spatial resolved measurement of the carrier lifetime in pc-CdTe gives an important insight to the charge carrier dynamics of the material.

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