Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.106
Publication date: 30th March 2023
The goal of third-generation PV is to go beyond the Shockley–Queisser limit, the
theoretical limit of 33 % for a single p-n junction solar cell. A hot carrier solar cell
(HCSC) has been proposed to overcome this limit, by harvesting carriers before they
have lost their surplus energy. Theoretically the prevented thermal losses could
boost the efficiency of a HCSC up to 66%
One promising type of materials for these purposes is halide perovskite. Next to
having excellent PCE, being cheap and solution processable, HP’s have shown very
long cooling times, the key parameter for a HCSC. We wish to shed light on why
relaxation times are found to be so long in HP’s.
By using an Ensemble Monte Carlo (EMC) simulation we are able to simulate the
trajectories of charge carriers and model their interactions with their environment. In
the EMC random free flight times are generated and interrupted by scattering events
with desired scattering mechanisms. It is this freedom of choice which makes the
EMC an excellent tool in order to investigate what exactly causes charge carriers in
halide perovskites to cool
In this contribution we identify the roles of electron-phonon and electron-electron
scattering in the thermalisation and cooling process, and show how these processes
depend on several material parameters. Furthermore, we zoom in on how cooling
times are impacted by
the degree of background doping. We show how an ensemble of background
carriers can have a detrimental effect on the cooling time. Our results are important
for the discussion on whether or not tin perovskites are suitable candidates for
HCSCs.
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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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