Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.024
Publication date: 6th February 2024
Triplet generation at the hybrid inorganic/organic semiconductor interface is a promising approach to extend the (photo-)excited state lifetime, and thus, facilitate solar energy harvesting. The generated triplet states can be easily utilized in triplet-triplet annihilation (TTA) upconversion (UC), where two low energy triplet states are combined to form one high energy singlet state. With this approach, it is possible to harness a greater portion of the solar spectrum and e.g., increase solar cell efficiencies. While substantial UC efficiencies have been demonstrated in solution-based UC systems, the required performance in their solid-state counterparts has not been achieved. Typically, excimer formation or intermolecular interactions result in an unfavorable singlet and triplet energy surface, disallowing efficient TTA.
While rubrene has been the most commonly studied annihilator in solid-state devices to date, it is not well matched with the perovksite sensitizer. We have recently placed an effort on replacing rubrene in the UC devices to increase the achievable apparent anti-Stokes shift. We have demonstrated successful upconversion using 9,10-Nanoscale, 2022,14, 17254-17261bis(phenylethynyl)anthracene and its derivatives and naphtho[2,3-a]pyrene.
Here, I will present the current understanding of triplet generation at the bulk perovskite/organic interface and discuss the role of molecular aggregation and intermolecular coupling on the energy landscape underlying the upconversion process.
C.M.S. and L.N. acknowledge funding by the National Science Foundation under Grant No. DMR-2237977 and the Camille and Henry Dreyfus Foundation (TC-23-050).
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