A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots

Abstract Time-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over...

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Autores principales:	Tamara Sloboda, Sebastian Svanström, Fredrik O. L. Johansson, Aneta Andruszkiewicz, Xiaoliang Zhang, Erika Giangrisostomi, Ruslan Ovsyannikov, Alexander Föhlisch, Svante Svensson, Nils Mårtensson, Erik M. J. Johansson, Andreas Lindblad, Håkan Rensmo, Ute B. Cappel
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1bc1b1b0391f48bfaeff6fe66aa62448
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spelling	oai:doaj.org-article:1bc1b1b0391f48bfaeff6fe66aa624482021-12-02T14:01:28ZA method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots10.1038/s41598-020-79792-z2045-2322https://doaj.org/article/1bc1b1b0391f48bfaeff6fe66aa624482020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79792-zhttps://doaj.org/toc/2045-2322Abstract Time-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over a wide time window spanning from pico- to microseconds in a single experiment carried out at the synchrotron facility BESSY II. The method is sensitive to small changes in core level positions. Fast measurements at low pump fluences are enabled by the use of a pump laser at a lower repetition frequency than the repetition frequency of the X-ray pulses used to probe the core level electrons: Through the use of a time-resolved spectrometer, time-dependent analysis of data from all synchrotron pulses is possible. Furthermore, by picosecond control of the pump laser arrival at the sample relative to the X-ray pulses, a time-resolution limited only by the length of the X-ray pulses is achieved. Using this method, we studied the charge dynamics in thin film samples of PbS quantum dots on n-type MgZnO substrates through time-resolved measurements of the Pb 5d core level. We found a time-resolved core level shift, which we could assign to electron injection and charge accumulation at the MgZnO/PbS quantum dots interface. This assignment was confirmed through the measurement of PbS films with different thicknesses. Our results therefore give insight into the magnitude of the photovoltage generated specifically at the MgZnO/PbS interface and into the timescale of charge transport and electron injection, as well as into the timescale of charge recombination at this interface. It is a unique feature of our method that the timescale of both these processes can be accessed in a single experiment and investigated for a specific interface.Tamara SlobodaSebastian SvanströmFredrik O. L. JohanssonAneta AndruszkiewiczXiaoliang ZhangErika GiangrisostomiRuslan OvsyannikovAlexander FöhlischSvante SvenssonNils MårtenssonErik M. J. JohanssonAndreas LindbladHåkan RensmoUte B. CappelNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-14 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tamara Sloboda Sebastian Svanström Fredrik O. L. Johansson Aneta Andruszkiewicz Xiaoliang Zhang Erika Giangrisostomi Ruslan Ovsyannikov Alexander Föhlisch Svante Svensson Nils Mårtensson Erik M. J. Johansson Andreas Lindblad Håkan Rensmo Ute B. Cappel A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
description	Abstract Time-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over a wide time window spanning from pico- to microseconds in a single experiment carried out at the synchrotron facility BESSY II. The method is sensitive to small changes in core level positions. Fast measurements at low pump fluences are enabled by the use of a pump laser at a lower repetition frequency than the repetition frequency of the X-ray pulses used to probe the core level electrons: Through the use of a time-resolved spectrometer, time-dependent analysis of data from all synchrotron pulses is possible. Furthermore, by picosecond control of the pump laser arrival at the sample relative to the X-ray pulses, a time-resolution limited only by the length of the X-ray pulses is achieved. Using this method, we studied the charge dynamics in thin film samples of PbS quantum dots on n-type MgZnO substrates through time-resolved measurements of the Pb 5d core level. We found a time-resolved core level shift, which we could assign to electron injection and charge accumulation at the MgZnO/PbS quantum dots interface. This assignment was confirmed through the measurement of PbS films with different thicknesses. Our results therefore give insight into the magnitude of the photovoltage generated specifically at the MgZnO/PbS interface and into the timescale of charge transport and electron injection, as well as into the timescale of charge recombination at this interface. It is a unique feature of our method that the timescale of both these processes can be accessed in a single experiment and investigated for a specific interface.
format	article
author	Tamara Sloboda Sebastian Svanström Fredrik O. L. Johansson Aneta Andruszkiewicz Xiaoliang Zhang Erika Giangrisostomi Ruslan Ovsyannikov Alexander Föhlisch Svante Svensson Nils Mårtensson Erik M. J. Johansson Andreas Lindblad Håkan Rensmo Ute B. Cappel
author_facet	Tamara Sloboda Sebastian Svanström Fredrik O. L. Johansson Aneta Andruszkiewicz Xiaoliang Zhang Erika Giangrisostomi Ruslan Ovsyannikov Alexander Föhlisch Svante Svensson Nils Mårtensson Erik M. J. Johansson Andreas Lindblad Håkan Rensmo Ute B. Cappel
author_sort	Tamara Sloboda
title	A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
title_short	A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
title_full	A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
title_fullStr	A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
title_full_unstemmed	A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
title_sort	method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/1bc1b1b0391f48bfaeff6fe66aa62448
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A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots

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