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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Photovoltaics: Nanostructured materials

HL 30.2: Talk

Tuesday, March 17, 2015, 10:30–10:45, ER 164

Investigation of the Spatial-Dependent Charge Carrier Collection Probability in CuInS2/ZnO Colloidal Quantum Dot Solar Cells — •Dorothea Scheunemann, Sebastian Wilken, Jürgen Parisi, and Holger Borchert — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg

Colloidal quantum dot (CQD) solar cells with solution-producible absorber layers have made rapid progress in the last few years. In particular, the so-called depleted-heterojunction concept, consisting of a wide band gap n-type semiconductor and a p-type CQD film as absorber, appears promising. As an alternative to the commonly used but highly toxic Pb chalcogenide materials, we recently reported on the successful utilization of CuInS2 nanocrystals as absorber layer in CuInS2/ZnO heterojunction solar cells [1]. However, to date, the efficiency of these devices remained limited compared to state-of-the-art Pb-based CQD solar cells. To investigate possible limitations of the CuInS2/ZnO system, we modeled the spatially and spectrally resolved absorption in the individual layers of the device stack using the transfer-matrix method. Here, we present a simple method to extract a spatial-dependent charge carrier collection efficiency based on the reconstruction of external quantum efficiency measurements using the modeled absorption profiles. With the help of this analysis, we identified a substantial “dead zone” in our devices, where the collection probability of excess carriers is dramatically reduced.

[1] D. Scheunemann et al., Appl. Phys. Lett. 103, 133902 (2013).

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