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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: P2: Organic Electronics and Photovoltaics

CPP 30.19: Poster

Dienstag, 17. März 2015, 14:00–16:00, Poster B

Exploring the impact of inter-segmental mixing and photodegradation on the photovoltaic performance of donor-acceptor-type polymer solar cells using a novel particle-based multiscale solar-cell algorithm — Anton Pershin, Sergii Donets, and •Stephan Baeurle — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg

Polymer solar cells possess a promising perspective for generating renewable energy at affordable costs, provided their performance and durability can be improved considerably. To this end, several experimental techniques have been devised recently, establishing a direct link between the local morphology, local opto-electronic properties and device performance. However, their reliability is still unclear to this day. Here, we demonstrate by using a novel particle-based multiscale solar-cell approach [1] and comparing its results with the ones of a field-based solar-cell algorithm that inter-mixing of the electron-donor(D)- and -acceptor(A)-type of segments in a lamellar-like PFB-F8BT blend causes that the major part of the charge generation and charge transport takes place in the bulk of the nanophases of the nanostructured polymer solar cells in agreement with recent experimental measurements and not, as commonly believed, at the visible domain boundaries of the DA interface. Moreover, we demonstrate that photo-oxidation of the fluorene moiety of the F8BT phase leads to keto-induced electron trapping, resulting in a deteriorated electronic transport efficiency in photodegradated PFB-F8BT-blend devices. Literature: [1] A. Pershin, S. Donets, S.A. Baeurle, Polymer 55, 3736 (2014).