Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.315
Publication date: 18th July 2019
The presence of mobile ionic charge in metal halide perovskite semiconductors requires the introduction of additional charge carrier variables to both time-dependent and steady-state descriptions of their devices. We have developed Driftfusion1: flexible, open-source, drift-diffusion simulation software capable of describing the evolution of electron, hole and ion concentrations, and electrostatic potential, in one-dimension across any number of different semiconductor layers. The simulations allow the underlying factors controlling the behaviour of optoelectronic devices containing mobile ions such as perovskite solar cells to be understood and predicted2-4. Based on insights gained from these simulations we have developed an intuitive circuit model of perovskite device behaviour. The circuit model treats interfaces in the device by coupling the electrostatic potential of mobile ionic charge to the rate of charge transfer across interfaces using bipolar transistor elements to describe the process. The model allows impedance spectra of mixed conducting devices to be fit using physically meaningful parameters, and explains the large apparent capacitive and inductive behaviours often observed at low frequencies, as well as giving a more general description of the large perturbation behaviour of the devices.5
1 Calado, P., Gelmetti, I., Azzouzi, M., Hilton, B. & Barnes, P. R. F. (https://github.com/barnesgroupICL/Driftfusion, 2018).
2 Calado, P. et al. Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis. Nat Commun 7, 13831 (2016).
3 Calado, P. et al. Identifying Dominant Recombination Mechanisms in Perovskite Solar Cells by Measuring the Transient Ideality Factor. Physical Review Applied 11, 044005 (2019).
4 Calado, P. & Barnes, P. R. F. Is it possible for a perovskite p-n homojunction to persist in the presence of mobile ionic charge? arXiv:1905.11892 (2019).
5 Moia, D. et al. Ionic-to-electronic current amplification in hybrid perovskite solar cells: ionically gated transistor-interface circuit model explains hysteresis and impedance of mixed conducting devices. Energy Environ. Sci. 12, 1296-1308 (2019).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.