Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 66: Focus Session (CPP with HL): Hybrid photovoltaics and perovskites I

HL 66.2: Talk

Thursday, March 19, 2015, 10:00–10:15, C 130

Electron tomography of interpenetrating polymer:nanocrystal networks as photoactive layers in hybrid solar cells: correlations between the morphology and device performance — •Holger Borchert, Christopher Krause, Dorothea Scheunemann, and Jürgen Parisi — Carl von Ossietzky University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg, Germany

Hybrid bulk heterojunction solar cells use as absorber layer an interpenetrating network of conductive polymer and inorganic semiconductor nanocrystals. Thereby, the nanomorphology of the blend layers plays an important role for the functionality of the devices. On the one hand, the absorber layer should have a large interface between both material components in order to enable efficient separation of electron-hole pairs. On the other hand, continuous pathways for electrons through the nanoparticle phase and holes through the polymer phase are required in order to enable efficient transport of the charge carriers towards the electrodes. A unique technique to investigate the three-dimensional morphology of such hybrid material layers is electron tomography, where three-dimensional images are reconstructed from a series of transmission electron micrographs recorded under different angles. In the present contribution, we investigated active layers consisting of poly(3-hexylthiophene) and colloidally prepared copper indium disulfide nanocrystals. Correlations between the morphology of the blend layers and the electrical performance of hybrid solar cells are analyzed in dependence of varied preparation parameters.