Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Perovskite solar cells rely on selective transport layers to efficiently extract charge carriers and reduce non-radiative recombination at the interface with the contacts. In complete device stacks, the presence of mobile ions in the perovskite can significantly alter the defect concentration and the internal electric field at the interfaces. This strongly impacts carrier extraction and therefore the efficiency of the solar cell.
In this work, devices with lateral contacts are made such that the charge carrier dynamics at the interfaces can be studied in operando. Because the contacts are placed in plane, instead of stacked vertically, we can probe the charge carrier dynamics in a spatially resolved manner from the top. We study the recombination dynamics of charge carriers with steady-state photoluminescence and transient-photoluminescence measurements, both under electrical bias. These measurements image the change in the charge carrier distribution under varying applied voltage. By comparing these results with drift-diffusion simulations of the perovskite devices, we show that the ions significantly alter the electric field and therefore the carrier dynamics. This knowledge can help us in the future to predict how transport layers function in complete cell stacks and therefore strategically optimize and design better selective transport layers.
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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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