Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Poster: Structural Ordering and Electronic Transport (joint focus with HL)

CPP 6.6: Poster

Montag, 26. März 2012, 17:30–19:30, Poster A

Ordered TiO2 single crystal nanowire arrays for hybrid solar cells — •Julian Reindl¹, Jonas Weickert¹, Andreas Wisnet¹, Christina Scheu¹, and Lukas Schmidt-Mende² — ¹Ludwig-Maximilians-University, Munich — ²University of Konstanz

Organic Solar cells are an interesting technology where remarkable efficiencies beyond 8 % have been realized with the bulk heterojunction concept. Here a donor-acceptor blend is fabricated as absorbing and charge transporting layer. Even though this concept is striking for thin films, the unordered inner morphology of the active layer has detrimental effects in thicker layers due to higher charge trapping and charge carrier recombination. A promising approach to realize thicker active layers with accordingly higher absorptivity is the hybrid solar cell concept, where the organic donor is substituted by a wide band gap metal oxide like titania (TiO2). The TiO2 can be nanostructured, resulting in a controlled phase separation of donor and acceptor.

Here we present a possibility of synthesizing a layer of ordered monocrystaline rutile titania wires with controllable properties such as wire length, diameter and spacing. This layer acts as electron transporting matrix and should provide enhanced electron mobility compared to polycrystaline titania layers. In order to fabricate hybrid solar cells we fill these structures with the commonly used polymer P3HT. For better structure filling novel attempts using different methods are studied, including interface engineering and an approach using diethylflourene monomers, which can be polymerized inside the structure.