Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Fundamental understanding of the ultrafast charge separation and trapping mechanisms in organic materials is essential for improving the efficiency of plastic photovoltaic devices. One of the selective tools to address the dynamics of bound/unseparated charged states in working devices at ‘sun-illumination’ conditions is a pump-push spectroscopy with photocurrent detection (PPP). Here we report a PPP and photoluminescence study of charge dynamics in model and promising organic photovoltaic systems, including TQ1, PPV and fullerene materials. We elucidate the dynamics of bound charges as a function of morphology, temperature and external field and observe that the photophysics and the key loss mechanisms can vary strongly from one system to another. For example, while model PPV-fullerene blends do not show a clear field dependence but a noticeable activation of bound states by temperature, the TQ1:fullerene systems demonstrate the opposite trend. Overall, our results suggests the presence of two different charge separation mechanisms in OPV systems which may resolve some previous discussion on the „thermodynamic“ and „delocalization“ charge separation models.
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