Abstract
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/C60) and inverted (C60/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 C60/ITO Schottky junction, and a change from exciton-quenching to exciton-blocking behavior of the SubPc:MoOX interface in inverted devices.
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