Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.125
Publication date: 30th March 2023
Understanding where the photovoltage is generated in a solar cell and where energy losses occur is a key aspect for the development of any solar cell technology.
In time-resolved photoelectron spectroscopy, photo-induced core level shifts can be measured as a function of pump-probe delay time and used to determine how the electric field between sample surface and substrate changes upon illumination. This gives insight how the photovoltage in the cell rises and decays over time. We have previously used this technique to follow the charge separation and recombination between a lead sulphide quantum dot layer and an electron transport layer from pico- to microsecond timescales.1
Here, I will present how we have extended our previous study to investigating the photovoltage generation in different parts of the quantum solar cell through sample design. In addition to investigating charge separation to an electron transport layer, we also investigated the photovoltage generation at the junction between p- and n-type quantum dot layers. The results are then compared to the photovoltage generation in a full quantum dot solar cell, where a gold contact is present. The highest photovoltage was generated in this latter case, and the presence of the gold contact also led to a decrease in the charge recombination rate.
Finally, I will discuss how this technique could be applied to other solar cell technologies and what potential the technique has for giving insights into the development of solar cells.
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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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