Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 60: Organic Electronics and Photovoltaics: OPV II (jointly with CPP, HL)

TT 60.9: Talk

Wednesday, March 18, 2015, 11:45–12:00, C 130

Exploring the performance enhancement potential of the tapering technology for block-copolymer 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, Deutschland

Tapered block copolymers offer an exciting opportunity to tailor the interfacial region between different components by conserving their phase-separated mesoscale structure, which enable the generation of polymer systems with the desired spatio-dynamic properties. In this presentation, we explore their usefulness for optimizing the photovoltaic performance of polymer bulk heterojunctions. To this end, we apply a recently developed particle-based multiscale solar-cell algorithm [1,2] and investigate the effect of random tapering at the chemical junctions between the electron-donor- (D) and electron-acceptor- (A) blocks on the photovoltaic properties of various lamellar-like polyfluorene-based block-copolymer systems. Our simulation results [2] reveal that introducing a tapered middle block with optimal length leads to a significant increase of the exciton dissociation efficiency, but deteriorates the charge transport efficiency only moderately. This results in a gain of the internal quantum efficiency from 25 up to 39 % by increasing the thickness of the active layer of the solar cell from 10 up to 50 nm in direction to the DA interface. Literature: [1] A. Pershin, S. Donets, S.A. Baeurle, Polymer 55, 3736 (2014); [2] A. Pershin, S. Donets, S.A. Baeurle, Polymer 55, 1507 (2014).