Berlin 2024 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Organic Electronics and Photovoltaics II
CPP 31.10: Vortrag
Mittwoch, 20. März 2024, 17:30–17:45, H 0110
What makes thickness-tolerant organic solar cells? — Xabier Rodríguez-Martínez1, •Constantin Tormann2, Marta Sanz3,4, Bernhard Dörling3, Martí Gibert-Roca3, Albert Harillo-Baños3, Enrique Pascual-San-José3, José Piers Jurado3, Laura López-Mir4, Martijn Kemerink2, and Mariano Campoy-Quiles3 — 1Institute for Physical Chemistry, Heidelberg University, Germany — 2Institute for Molecular Systems Engineering and Advanced Materials, Heidelberg University, Germany — 3Instituto de Ciencia de Materiales de Barcelona, Bellaterra, Spain — 4EURECAT, Centre Tecnológic de Catalunya, Barcelona, Spain
Thick-film organic photovoltaics (>200 nm) are desirable to spark commercialization through mass-printing methods. Thickness resilient materials are, however, scarce and not fully understood. In this work, 17 different donor:acceptor blends are screened in terms of photoactive layer (PAL) thickness to build a consistent database of 649 inverted devices. The experimental results can be categorized into to two main blend families: one being resilient against increased PAL thickness whereas short-circuit current (JSC), fill factor (FF) and power conversion efficiency (PCE) decrease in the second family. Our kinetic Monte Carlo (kMC) simulations show how the blend morphology alone is able to explain the trends of both blend families without tweaking of recombination parameters (cf. drift-diffusion). The kMC simulations further predict the open-circuit voltage (VOC) to be uncorrelated to the PAL thickness which agrees with the experimentally observed trends for VOC in both blend families.
Keywords: organic photovoltaics; thick films; kinetic Monte Carlo; organic solar cells