Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
DOI: https://doi.org/10.29363/nanoge.iperop.2020.095
Publication date: 14th October 2019
Metal-halide perovskites are exciting materials for solar cell applications due to their high photogeneration efficiencies and ease of fabrication. The stability of perovskite solar cells, however, is poor – particularly under full sunlight and harsh outdoor conditions. Ambient light energy harvesting in indoor environments, where stability concerns are less acute, is therefore an attractive near term application for emerging perovskite technologies. Not all solar cells operate efficiently in low light, however, so in this study we set out to examine the properties and performance of our highly efficient mixed-composition Cs0.05FA0.80MA0.15PbI2.75Br0.25 perovskite devices1 as a function of light intensity.
A typical cell was found to retain about 25% of the maximum efficiency down to the lowest measured light intensities of 0.03 mW/cm2 (1/3000th of full sunlight, or 30 Lux). The maximum efficiency is observed at 10 mW/cm2 (1/10th of full sunlight, 10 000 Lux). In addition to current-voltage analysis, impedance spectroscopy was employed to investigate the underlying mechanisms governing the change in cell performance. The parallel resistance, rp, resolved by the impedance measurements, is compiled as a function of applied bias voltage and incident light intensity. While usefully high at ambient light levels, the parallel resistance falls dramatically in stronger light, particularly at moderate voltages, resulting in significant loss of fill factor. The FF loss is shown to be the primary cause of the reduction in cell efficiency above 10 mW/cm2. These results can be comprehensively explained by introducing a field-dependent photocurrent into the standard equivalent circuit, and is accurately modelled using the constant-field approximation developed previously for amorphous Si photodiodes.2,3
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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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