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Issue 12, 2017
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Charge carrier trapping controlled by polymer blend phase dynamics

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Abstract

It has recently been shown that diluting a semiconducting polymer with an insulating or large band gap host material can lead to elimination of charge trapping in the former. In this work we systematically study the role of the phase thermodynamics of such blends via tuning the miscibility between the semiconductor (here: MEH-PPV) and host (here: polystyrene or polyvinyl carbazole), by varying the molecular weight of the latter. We show that calculation of the ternary phase diagram of semiconductor, insulator and solvent can predict whether charge transport in the dry blend film will be trap-free or not. Blending MEH-PPV with 35 kg mol−1 polystyrene does not lead to alleviation of the trap-limited nature of the electron current due to strong segregation of the polymers and the formation of pure coexisting phases. In contrast, the electron current in miscible (1 kg mol−1 polystyrene) or partially miscible (30 kg mol−1 polyvinyl carbazole) blends increases by up to four orders of magnitude compared to the pristine semiconductor, together with a doubling in luminous efficiency of the corresponding light-emitting diode.

Graphical abstract: Charge carrier trapping controlled by polymer blend phase dynamics

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Publication details

The article was received on 21 Nov 2016, accepted on 21 Feb 2017 and first published on 21 Feb 2017


Article type: Paper
DOI: 10.1039/C6TC05065D
Citation: J. Mater. Chem. C, 2017,5, 3042-3048
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    Charge carrier trapping controlled by polymer blend phase dynamics

    A. Kunz, P. W. M. Blom and J. J. Michels, J. Mater. Chem. C, 2017, 5, 3042
    DOI: 10.1039/C6TC05065D

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