Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
Publication date: 6th February 2024
Even though the efficiency of perovskite solar cells has increased significantly in recent years, their long-term stability is still poor, hindering commercial applications. One of the main reasons for this poor stability is mobile ionic carriers which can migrate within the perovskite crystal lattice and often accumulate at the adjacent charge transport layers, reducing the extraction efficiency of electronic carriers. In order to mitigate ion migration, reliable ways of quantifying the density, mobility, and activation energy of mobile ions are necessary. Here, we propose an updated way of characterizing mobile ions based on capacitance transients. In capacitance transients, we generally measure the modulation of the electronic capacitance due to mobile ions drifting through the perovskite. In our updated approach, we first approximate the ionic and electronic carrier distributions and the potential distribution within a perovskite solar cell after applying a voltage pulse. Subsequently, we calculate the capacitance from these distributions using a small-signal approximation, resulting in capacitance transients. By fitting capacitance transients generated from drift-diffusion simulations, we show that an accurate extraction of the density, mobility, and activation energy of mobile ions within the perovskite is possible.
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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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The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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