Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.205
Publication date: 30th March 2023
Time-resolved optical spectroscopic techniques typically monitor the evolving population of energy states after photoexcitation; and carrier mobility measurements often require the careful fabrication of full-stack electronic devices. Here, we study carrier dynamics in single-crystal CsPbBr3 using ultrafast THz spectroscopy, a method which is not only sensitive to carrier density but is also a non-contact probe of carrier mobility in bare films. We show that the charge mobility in this highly crystalline material is considerably higher than perovskite thin-films grown by conventional methods. The temperature-dependent photoconductivity reveals strongly non-Drude behaviour in the frequency domain, with strong phonon resonances that support the polaron picture of the soft crystal lattice. We further extend the time-resolved measurements to three-pulse ‘pump-push-probe’ spectroscopy to study hot carrier cooling dynamics which depend on a rich interplay of carrier-phonon and carrier-carrier interactions. Finally, the steady-state fluence-dependent photoluminescence spectra in these controlled-growth lead halide perovskite materials are found to contain features attributed to optical gain.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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