Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.42: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Photophysical properties of ternary non-fullerene organic solar cells — •Ali Sahin, Dirk Hertel, and Klaus Meerholz — University of Cologne, Luxemburgerstr.116, Cologne, Germany

Organic solar cells (OSC) are considered an attractive alternative to conventional inorganic solar cells. The benefits OSC offer, result from their favorable low-cost fabrication and their application in thin-film form. The active layer of an OSC is typically composed of two components in a bulk-hetero junction (BHJ) mixture, an electron donor (p-type semiconductor) and an electron acceptor (n-type semiconductor). Upon light excitation the formed exciton has to diffuse by typically 10-30nm to reach to D-A interface, where it dissociates into free charge carriers. Fullerene derivatives have dominated as acceptors for many years, but recently non-fullerene acceptors - mostly of ADA motif - have entered the scene [2]. Ternary BHJ cells with three components in the active layer represent one way to finetune the interface. Therefore, a series of new n-type ADA-acceptors were investigated with regard to their photophysical properties and in combination with various p-type conjugated polymers. Conductivity measurements of the neat materials and mixtures were carried out in field-effect transistors and compared with the photo-CELIV and TPV measurements in corresponding BHJ films. The charge carrier lifetime and the recombination rates were determined in order to correlate the molecular properties and BHJ properties in the thin-film with the photovoltaic parameters in binary and ternary OSC.

[2] Y. Lin et al., J. Am. Chem. Soc., 2016, 138(9), 2973-2976.