Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.289
Publication date: 20th April 2022
After an extraordinary rise in power conversion efficiency, perovskite thin film technology is reaching the performance of silicon photovoltaics, and tandem applications such as perovskite-on-silicon are promising candidates to go well beyond 30 % efficiency. Regarding commercialization, however, understanding possible degradation mechanisms is mandatory, given that silicon technology guarantees an efficiency loss of less than 20 % in 25 years. Ionic point defects and static deep traps - mobilised by high temperature, irradiation and external electric fields - contribute to the intrinsic instability of perovskite solar cells. Several strategies to passivate defects and suppress their dynamics are used, with arguably the most promising being ionic additives intermixed into the active layer. This approach has led to stability records while maintaining high efficiencies above 20 %. Recent research indicates a lack of in-depth understanding of the actual defect passivation effect and calls for suitable characterization methods. Dynamic processes due to mobile ions, trap development or phase segregation within the perovskite layer are well studied individually, but their interplay has still to be further unravelled. To establish a convincing picture of the passivating effects additives have on defects under operation conditions, typically used electrical and optical methods are combined with fast logarithmic (µs to s) electric pulses. While the solar cell with and without additive [1] is aged at high temperatures and full-spectrum simulated sunlight, fast JV measurement track hysteresis evolution, photoluminescence measurement provide information on phase segregation [2] and the quasi-Fermi level splitting [3], time-resolved photoluminescence tracks charge carrier lifetime as a measure for deep trap Shockley-Read-Hall recombination, and impedance spectroscopy at lower frequencies is a measure for EDL formation and recombination currents. The fast logarithmic (µs to s) electric pulses reveal the ageing behaviour of the dynamic processes and combine the results of the other characterisation methods. The method is explained and first results are shown.
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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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
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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