Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 65: Poster: Organic electronics and photovoltaics (CPP; jointly with HL, O)

HL 65.22: Poster

Wednesday, March 13, 2013, 16:30–18:30, Poster C

A multiscale modeling study of loss processes in block-copolymer-based solar cell nanodevices — •Sergii Donets, Anton Pershin, and Stephan Baeurle — University of Regensburg, Institut of Physical and Theoretical Chemistry, D-93053

Flexible photovoltaic devices possess promising perspectives in opto-electronic technologies, where high mobility and/or large-scale applicability are important. However, their usefulness in such applications is currently still limited due to the low level of optimization of their performance and durability. For the improvement of these properties a better understanding and control of small-scale annihilation phenomena of the elementary particles involved in the photovoltaic process, such as exciton loss and charge carrier loss, are necessary. Here, we explore the causes for their occurrence with a novel field-based solar-cell algorithm on the example of self-organizing nanostructured block-copolymer systems, which possess a broad variability in their chemical and physical characteristics, and explore new routes to optimize their performance. From our calculations, we deduce that in the regime from low up to intermediate chi-parameters the charge transport efficiency (CTE) and internal quantum efficiency (IQE) of both block-copolymer systems increase up to a maximum, characterized by a minimum in the number of charge losses due to charge recombinations. In the regime of high chi-parameters they form nanostructures with a large number of bottlenecks and dead ends, leading to a large number of charge losses due to charge recombination, charge trapping and an impaired exciton dissociation.