Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.499
Publication date: 16th December 2024
Solution-processed nanocomposite films comprising small molecule organic semiconductors (OSCs) and inorganic colloidal quantum dots (QDs) are promising systems for low-cost, high efficiency, solar energy harvesting technologies.[1,2] In these systems, OSCs capable of singlet fission (SF) absorb high energy photons and generate triplet excitons which are harvested by inorganic QDs. Here, radiative recombination results in the emission of multiple lower energy photons which could be absorbed by an optically coupled silicon-photovoltaic (Si-PV) module, offering a route to surpass the radiative efficiency limit. Achieving efficient photon-multiplication requires a precise nanoscale morphology, with QDs uniformly dispersed within the OSC matrix at length scales comparable to the triplet exciton diffusion length. However, mismatches in size, shape, and surface energy between QDs and OSCs typically results in strong aggregation and phase separation. Whilst a proof-of-concept system has been achieved based on a tetracene derivative,[3] the emission of the OSC is spectrally mismatched to Si-PV absorption, limiting its use in practical applications. This work explores the self-assembly of high-triplet energy OSCs based on diphenylhexatriene (DPH) and dithienohexatriene (DTH) derivatives that offer improved spectral matching with Si-PV. In-situ grazing incidence X-ray scattering is employed during high-throughput blade coating to study the self-assembly of promising DPH-/DTH-based systems. Improved QD dispersions are obtained by tailoring QD surface chemistries and optimizing thermal processing conditions. The results provide design rules and scalable processing strategies for developing photon-multiplier films, paving the way for their integration into high-efficiency Si-PVs for enhanced energy harvesting.
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