Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.071
Publication date: 18th July 2019
The inefficient charge collection is often regarded as the bottleneck which limits the device performance of bulk-heterojunction (BHJ) organic solar cells. It is a general notion that the existence of isolated electron donor (D) or acceptor (A) phase would hinder charge collection due to the energy cascade at the D/A interface. However, using a dedicated sandwich (A/D/A) device structure, we provide strong evidences that under the operating conditions of solar cells, the photogenerated hole-carriers are able to migrate from the donor phase to the acceptor phase in spite of the apparent transfer barrier, and then be collected through the acceptor phase. In addition, we find the surface composition of the BHJ layer near the anode interlayer (MoO3) can play a key role in BHJ devices, which is responsible for the previously observed correlation between the open-circuit-voltage (VOC) and the BHJ volume ratio. It is demonstrated here that the nonradiative recombination can be largely reduced, while VOC and thus device performance can be substantially enhanced by adding a fullerene interlayer at the MoO3/BHJ interface.
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