Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Time-resolved fluorescence spectroscopy is a powerful tool to investigate the photo-luminescence dynamics of semiconductor systems on the femtosecond timescale. Available experimental techniques, such as those based on the use of streak cameras or time-correlated single photon counting (TCSPC) are limited by a temporal resolution of a few picoseconds [1]. A resolution of at most 0.2-0.5 ps, however, is deemed necessary to monitor the early events occurring during the relaxation of hot carriers and the formation of excitons in direct bandgap materials. To allow for such a time-resolution, the emission of the sample can be upconverted (gated) by sum-frequency mixing with an ultrashort pulse in a nonlinear optical crystal.
Here, we are presenting a new broadband (λ = 420-750 nm) fluorescence up-conversion setup (FLUPS) developed by Ernsting et al. [2], which allows single-scan pump-gate measurements. The time resolution of the FLUPS instrument is only limited by the gate pulse duration and has been found to be < 200 fs for our setup. A spectral discrimination of less than 50 cm–1 is achieved, moreover, using an unfolded Czerny-Turner spectrometer for signal detection.
We demonstrate the ability of FLUPS by investigating the early-time evolution of the fluorescence of two-dimensional lead trihalide perovskites. The rise of the photoemission of such 2-D films has been found to be of the order of 0.9 ps to 1.2 ps, depending on the cation and fluence, which is well above the experimental response function. A deeper analysis of the kinetics of the fluorescence rise will provide insights into the dynamics of the charge carriers and pseudo-particles upon light excitation of low-dimensionality perovskites of various compositions and architectures.
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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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