Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.105
Publication date: 6th February 2020
Modeling perovskite cells with the drift-diffusion approach including both electronic and ionic charge carriers can qualitatively reproduce several characteristic measurement results including IV curve hysteresis [1,2], dark current decay transients [3] and negative capacitance [4]. Up to now, however, no parameter set has been published which quantitatively matches multiple experiments. This raises the question, whether and how the model needs to be extended or adapted further.
The commonly used drift-diffusion approach makes use of the Boltzmann statistics for both electronic and ionic charge carriers. This model typically leads to a strong accumulation of ionic charge carriers at layer interfaces and thus a very fine space discretization is required in order to achieve numerical results of sufficient precision. More importantly, the exceedingly high ion density close to interfaces contradicts the physical understanding of ions as particles or vacancies with a certain volume requirement. S. van Reenen et al [5] described this behavior for OLECs but they circumvented the problem of strong accumulation by using a coarse space discretization.
We propose to model the interaction among ionic charge carriers as a purely geometrical effect. The steric potential derived in that way leads to a Fermi-like model [6], which effectively takes into account the limited amount of available states for ions in a given volume.
In this presentation, we shall discuss the suggested model and its implementation for both, steady-state and transient drift-diffusion simulations. In a detailed case study for a Methyl Ammonium Lead Iodide (MAPI) perovskite solar cell, we investigate the influence of the steric potential on the charge carrier profiles and we discuss the impact of the charge carrier statistics on the device properties of a solar cell.
The proper understanding of ion accumulation at the interfaces of perovskite devices will be a significant step towards the description of the full steady-state and dynamic device characteristics by a single set of parameters.
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.