Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.218
Publication date: 18th July 2019
Singlet-fission (SF) is a carrier multiplication process in organic materials where a photo-excited singlet state decays into two triplet excitons, each with roughly half the excitation energy. Integrated properly with a photovoltaic (PV) device the singlet-fission material can generate two charge carrier pairs per absorbed photon, leading to a significant increase in device performance. However, major challenges remain in how to integrate the SF material efficiently. A promising solution is to re-emit the exciton energy from the two triplet excitons as two low energy photons that can be re-absorbed by the PV device. This scheme allows for the decoupling and separate optimization of the PV device and SF-photomultiplier material. Unfortunately, triplet excitons are inherently dark. By transferring triplet excitons into emissive PbS quantum dots we are able to convert these dark states into photons. Here I will present our latest work on PbS-TIPS-Tetracene hybrid materials that show a 120% exciton multiplication with corresponding increas in the PbS emission when exciting the SF material. I will focus on the triplet energy transfer from the SF material TIPS-Tetracene to PbS quantum dots, and how it can be optimized through surface engineering with various ligands and quantum dot size.
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