The Physics of Perovskite Devices and Interfaces
Piers Barnes a
a Imperial College London, South Kensington, London,, United Kingdom
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#PERFuDe19. Halide perovskites: when theory meets experiment from fundamentals to devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Claudine Katan, Wolfgang Tress and Simone Meloni
Invited Speaker, Piers Barnes, presentation 315
DOI: https://doi.org/10.29363/nanoge.ngfm.2019.315
Publication date: 16th 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).

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