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Development of highly resolved and photo-modulated Kelvin probe microscopy techniques for the study of photovoltaic systems

Abstract : This thesis is directed towards the proposition and demonstration of a set of novel advanced atomic force microscopy based techniques under ultra-high vacuum conditions, enabling to map simultaneously the surface topography and the photo-carrier dynamics at the nanometre scale. In fact, by monitoring the dependence of the average surface photo-voltage measured with Kelvin probe force microscopy, as a function of the repetition frequency of a modulated excitation source, we will access the built-up and decay dynamics of the surface photo-voltage response which in turn will allows us to study the photo-carrier dynamics over a wide range of samples. In order to enable the 2-dimensional nano-imaging process, Kelvin probe force microscopy under modulated illumination measurements are acquired repeatedly over each point of a predefined grid area over the sample acquiring a set of spectroscopy curves. Then, using an automatic mathematical fit procedure, spectroscopy curves are translated into pixels of the photo-carrier dynamic time-constant images.Moreover, these set of novel techniques will be used to investigate the surface photo-voltage dynamics in several kinds of photovoltaic samples from different technological branches such as small grain polycrystalline silicon thin films, silicon nanocrystal-based third generation cells, bulk heterojunction donor-acceptor organic photovoltaics and organic-inorganic hybrid perovskite single crystal cells, discussing in each case the photo-carrier recombination process and its relation with the material’s structuration/morphology. Finally, technical aspects of these novel techniques will be discussed as well as their limitations and remaining open question regarding results interpretation.
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Submitted on : Thursday, January 31, 2019 - 9:11:30 AM
Last modification on : Thursday, June 11, 2020 - 5:04:08 PM
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  • HAL Id : tel-01970171, version 1




Pablo Arturo Fernandez Garrillo. Development of highly resolved and photo-modulated Kelvin probe microscopy techniques for the study of photovoltaic systems. Materials Science [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAY031⟩. ⟨tel-01970171⟩



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