Publication date: 3rd July 2020
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 triplets 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-photon multiplier material. Unfortunately, triplet excitons are inherently dark. By transferring triplet excitons into emissive PbS quantum dots (QDs) we are able to convert these dark states into photons.
Here I will present our latest work on PbS-TIPS-Tetracene hybrid materials that shows a 60% enhanced QD photoluminescence when exciting the SF material in solution and in film. 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. I will also touch upon the role of surface ligands on the film forming properties of the QD-organic hybrid materials. The fundamental understanding of the triplet energy transfer process to QDs discussed here will benefit the future design of other optoelectronic organic-inorganic hybrid nanomaterials
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