High voltage hybrid organic photovoltaics using a zinc oxide acceptor and a subphthalocyanine donor
Chloe Argent Dearden1, Marc Walker, Nicola Beaumont
1Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK. T.S.Jones@warwick.ac.uk.
Abstract:
We demonstrate hybrid organic photovoltaic (HOPV) bilayer devices with very high open circuit voltages (VOC) of 1.18 V based on a sol-gel processed zinc oxide (ZnO) acceptor and a vacuum deposited boron subphthalocyanine chloride (SubPc) donor layer. X-ray photoelectron spectroscopy (XPS) and Kelvin Probe (KP) measurements of the ZnO/SubPc interface show that the ZnO preparation conditions have a significant impact on the film composition and the electronic properties of the interface, in particular the work function and interface gap energy. Low temperature processing at 120 °C resulted in a ZnO work function of 3.20 eV and the highest VOC of 1.18 V, a consequence of the increased interface gap energy.
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