Abstract
Organic–inorganic hybrid heterojunctions have potential as the basis for futurephotovoltaic devices. Herein, we report the results of investigations exploring the possibilityof using pentacene and tetracene as photoelectron donors in conjunction with PbSnanocrystals (PbS-NCs). Photoinduced charge transfer was probed using externalquantum efficiency measurements on acene:PbS-NC hybrid photovoltaic devices inconjunction with photoluminescence studies of the corresponding bilayer films. It isshown that photoelectron transfer from pentacene to the PbS-NCs is inefficientas compared to that between tetracene and PbS-NCs. The latter case can berationalized in terms of the energy level alignment at the heterojunction assuming acommon vacuum level. However, in the case of pentacene:PbS-NC junctions aninterfacial energy level shift must be considered in order to explain the observations.
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