Abstract
Solar cells utilising heterojunctions between crystalline silicon and singlet fission materials are a new competitor to silicon tandem cells.
Highlights
Our report starts with a UV photoemission study of the silicon-tetracene interface, where we identify a type-I interface formed between the polaron transport levels of Tc and Crystalline silicon (c-Si), and offsets well-aligned for favourable charge transport
We find that the deposition of tetracene directly onto hydrogen-passivated silicon does not degrade the silicon passivation, and that p-type carriers are selectively extracted through the organic layer
Singlet fission is an attractive method for reducing thermalisation losses in silicon solar cells, which in their best-performing manifestation are approaching the Auger recombination conversion efficiency limit
Summary
This configuration harvests triplet excitons from the SF layer by exciton dissociation or transfer at the organo-silicon interface, while the organic acts concurrently as the silicon hole-selective contact. The fission process in Tc is endothermic, which is favourable for maximising the energy conversion yield.[12] The S1 state of Tc decays predominantly via SF in evaporated polycrystalline films, on a timescale of 10–100 ps, and the triplet lifetime is around 500 ns.[15,46] The limiting efficiency of a Tc/c-Si hybrid solar cell similar to those reported here has been calculated to be 35.8%,56 while the Auger limit of a normal silicon cell is 29.4%.3. We simulate the optical behaviour of the heterojunction and identify a cell design that minimises reflection losses
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