High efficiency organic photovoltaic cells based on inverted SubPc/C-60/ITO cascade junctions

Max Shtein

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mshtein@umich.edu

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T: (734) 764-4312

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SE Morris and M Shtein (2014)

ORGANIC ELECTRONICS, 15(12):3795–3799.

Conventional heterojunction organic photovoltaic cells typically involve the deposition of the electron donor layer (or donor-acceptor blend) on top of a transparent anode, with the cathode deposited last. Inverting the structure and deposition sequence usually worsens the performance characteristics, except device lifetime. We compare conventional (SubPc/C-60) and inverted (C-60/SubPc) junctions, the latter exhibiting a power conversion efficiency of 3.5\%. We also find a significant trade-off between the open circuit voltage and short circuit photocurrent, potentially attributable to the formation of a C-60/ITO Schottky junction, and a change from exciton-quenching to exciton-blocking behavior of the SubPc: MoOX interface in inverted devices. (C) 2014 Elsevier B.V. All rights reserved.

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