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4 May 2012 Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer
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Abstract
The transport properties of two photovoltaic polymers, poly(3-hexylthiophene) (P3HT) and poly(2,7-carbazole) derivative (PCDTBT), and their polymer:fullerene bulk heterojunction (BHJ) are studied by space-charge-limited current (SCLC), dark-injection space-charge-limited current (DI-SCLC), and admittance spectroscopy(AS). For a nominally hole-only device, electrons leakage occurs. This results in a current larger than the theoretical SCLC and ill-defined DI-SCLC and AS signals. In order to prevent electron leakage, a hole-transporting but electron blocking/trapping thin layer is added between active layer and Au. The layer composed of copper phthalocyanine (CuPc) doped into an amine-based small molecule. Using this interlayer, well-defined carrier transit time can be obtained for mobility extraction. With a suitable interlayer to suppress undesirable carrier injection and transport, these techniques should find broad applications in the transport characterization of narrow gap photovoltaic polymers and BHJ blends.
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Harrison K. H. Lee, Kevin K. H. Chan, and S. K. So "Charge transport studies of polymeric photovoltaic thin films with an electron blocking and trapping layer", Proc. SPIE 8435, Organic Photonics V, 84351U (4 May 2012); https://doi.org/10.1117/12.922172
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