Numerical analysis of single-point spectroscopy curves used in photo-carrier dynamics measurements by Kelvin probe force microscopy under frequency-modulated excitation

Beilstein Journal of Nanotechnology
Pablo A Fernández GarrilloŁukasz Borowik

Abstract

In recent years, the investigation of the complex interplay between the nanostructure and photo-transport mechanisms has become of crucial importance for the development of many emerging photovoltaic technologies. In this context, Kelvin probe force microscopy under frequency-modulated excitation has emerged as a useful technique for probing photo-carrier dynamics and gaining access to carrier lifetime at the nanoscale in a wide range of photovoltaic materials. However, some aspects about the data interpretation of techniques based on this approach are still the subject of debate, for example, the plausible presence of capacitance artifacts. Special attention shall also be given to the mathematical model used in the data-fitting process as it constitutes a determining aspect in the calculation of time constants. Here, we propose and demonstrate an automatic numerical simulation routine that enables to predict the behavior of spectroscopy curves of the average surface photovoltage as a function of a frequency-modulated excitation source in photovoltaic materials, enabling to compare simulations and experimental results. We describe the general aspects of this simulation routine and we compare it against experimental results prev...Continue Reading

References

Aug 15, 2006·Nature Materials·David C Coffey, David S Ginger
Dec 4, 2014·Nature Nanotechnology·Matthew C BeardArthur J Nozik
Oct 21, 2016·ACS Applied Materials & Interfaces·Pablo A Fernández GarrilloBenjamin Grévin
Dec 9, 2017·ACS Applied Materials & Interfaces·Yann AlmadoriBenjamin Grévin

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Citations

Mar 3, 2020·Beilstein Journal of Nanotechnology·Benjamin GrévinRenaud Demadrille
Jan 27, 2019·Beilstein Journal of Nanotechnology·Rüdiger BergerYi Zhang

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Software Mentioned

SCILAB
KPFM
SPECTY
OriginPro

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