Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Organic Electronics and Photovoltaics
CPP 30.8: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster B2
Investigation of the donor-acceptor coupling strength in DBP:C70 solar cells — •Thomas Zechel, Theresa Linderl, Thomas Lampe, and Wolfgang Brütting — Institute of Physics, University of Augsburg, 86159 Augsburg
The strength of the donor (D) acceptor (A) interaction can have an influence on the open circuit Voltage (VOC) in organic solar cells as demonstrated by Vandewal et al. [1]. Here it is shown that the strength of the D-A interaction in Tetraphenyldibenzoperiflanthen(DBP):Fulleren C70 planar mixed hetero junction (PM-HJ) solar cells decreases with decreasing the amount of DBP in the mixed layer. However, no significant changes in VOC for this D-A pairing can be observed. The coupling strength is obtained from electroluminescence (EL) and external quantum efficiency spectra of working devices. Temperature dependent EL measurements reveal two charge transfer peaks with different temperature dependence. At the same time the current voltage characteristics of the different devices show that only a small amount of DBP is necessary for efficient charge separation.
[1] Vandewal, K. et al., Physical Review B, 2010, 81, 125204