Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.181
Publication date: 30th March 2023
The efficiency of halide perovskite solar cells has been continuously rising over the past decade to values above 25%. Future technological development will have to deal with issues of device stability but also thrive to further minimize efficiency-limiting loss processes in the bulk and at interfaces within the cell stack. The identification and understanding of electrical losses will require the ability to characterize solar cells and multilayer stacks with a variety of steady-state, time-domain and frequency-domain techniques that are sensitive to the transport and recombination of charge carriers. Especially, time- and frequency-domain techniques offer a large amount of information on dynamic processes in the solar cell, while posing a substantial challenge in terms of the complexity of data analysis.[1]
Here, we discuss three novel and relevant aspects related to transient photoluminescence (TPL) and photovoltage spectroscopy (TPV) applied to halide perovskites. We show that by using extremely low repetition rates and a gated CCD camera, we can obtain high dynamic range TPL data with continuously changing decay times that exceed 100µs. Furthermore, we show that by changing the repetition rate, basically any decay time can be extracted from one sample, whereby the extracted decay time is approximately the inverse repetition rate. We explain why this is the case both mathematically and physically. Whenever, higher order recombination due to e.g. band to band or band to shallow trap transitions affects the decay, the decay time will correlate with the time range of the measurement which is typically limited by the inverse repetition rate. Finally, we show how to separate recombination from extraction by using TPV data combined with a novel analysis approach based on the determination of eigenvalues of a 2 × 2 matrix. The model provides two time constants (the inverse eigenvalues), one for the rise and one for the decay of the voltage after the pulse. These two time constants can be experimentally determined as a function of light intensity. By comparison of model and experimental data, we can then derive a time constant for recombination and one for charge extraction, whereby the ratio of these two time constants is directly correlating with solar cell efficiency.
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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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