Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Transient photoluminescence (TRPL) experiments became an indispensable tool for characterization of radiative and non-radiative loss channels in perovskite-based device architectures [1,2] through the use of detailed balance relations or fitting of rate equations. However, due to the sharp absorption edge of perovskites resulting in a strong overlap of absorption and emission spectra [3], as well as the low non-radiative losses in high-quality perovskites [4], significant photon recycling occurs which will alter the shape and strength of the resulting spectral TRPL signal [5].
It is therefore crucial to take all these effects into account carefully in order to predict and correctly interpret such experiments. However, up to this day, most theoretical or simulation-based investigations into this topic were either limited to simple device architectures with photon recycling taken into account using only ray-optical considerations [5] or more complex architectures but lacking any impact of photon recycling [6].
In our talk, we will present fully-coupled opto-electronic simulations of TRPL where photon recycling, based on a transverse Green’s function model, is taken into account in a full-wave picture and self-consistently coupled to the electronic transport solved by a drift-diffusion approach, resulting in a more accurate prediction of the emitted TRPL spectrum. Due to consistent consideration of the detailed balance principle in the local radiative rates, as well as the inclusion of the correct local photonic density of states, the resulting PL spectrum is conforming with global detailed balance relations such as generalized Kirchhoff [7].
Furthermore, our approach is not limited to single layer structures, instead, more complex device structures can also be analyzed, where the full optoelectronic approach allows to consider non-radiative loss channels, especially trap-assisted recombination at interfaces.
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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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