Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Perovskite-based tandem solar cells have rapidly developed in the last few years, to a current record power conversion efficiency (PCE) of 29.5% and several research groups overcoming 27% PCE. The predicted realistic target PCE of around 33% is nevertheless still far away. The set of measurement techniques suitable for tandem solar cells is smaller compared to single junction solar cells due to the series connection of subcells in monolithic architecture, especially when characterizing individual subcells. Here, we present a setup for advanced characterization of tandem solar cells, based on a bichromatic LED light source. Two spectrally independent LED arrays are used to independently bias individual subcells. Blue LEDs with a central wavelength of λ = 470 nm are used to bias the top cell, while IR LEDs (λ = 940 nm) bias the bottom cell. This enables accessing properties of each subcell through e.g. light intensity dependent I-V measurements and extracting one-diode model parameters, shunt resistance, series resistance, ideality factor and saturation current density. With this method and using one-diode model for each subcell we are able to reconstruct tandem J-V and disentangle it into subcell J-Vs. We validate the procedure using simulations that return excellent agreement, while for the fabricated tandem device, we observe a slight discrepancy around maximum power point, attributed to voltage-dependent ideality factor. The developed BCLED tool can therefore be used for subcell sensitive analysis and also long-term stability testing due to longevity of LEDs.
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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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