Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 28: Poster: Fundamentals of Perovskite Photovoltaics (joint session CPP, DS, HL)

HL 28.11: Poster

Monday, March 20, 2017, 18:30–21:00, P1A

Tuning the pore size of mesoporous titania films for hybrid solar cells — •Steffen Schlosser, Nuri Hohn, Lorenz Biessmann, Senlin Xia, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str 1, 85748 Garching

Hybrid solar cells combine the mechanical stability of inorganic and the versatility of organic semiconductors. Due to their potential for large-scale application, hybrid solar cells are especially interesting for low-cost industrial production. As an inorganic compound, mesoporous titania films are common for application in high-efficiency hybrid solar cells. The mesoporous character offers a high interfacial contact with the organic surfactant, usually a conjugated polymer. Challenges concerning these cells arise due to the difficulty of controlling their nanoscale structure, which affects conductivity and degree of backfilling. We focus on the tuning of the pore size of mesoporous titania nanostructures and its impact on the infiltration of the polymeric compound. Tuning of the pore sizes provides the possibility of enhancing the backfilling and thus has a positive impact on solar cell performance. In our experiments, a solution composed of an amphiphilic block copolymer and a precursor dissolved in an organic solvent is applied as a film. Immersion in an antisolvent leads to a structure formation process in the composite film, so that after calcination, a mesoporous titania film is obtained. Depending on the parameters used, the pore size can be controlled.