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

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

Sloboda, Tamara (author): KTH,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Div Appl Phys Chem, Dept Chem, S-10044 Stockholm, Sweden.

Svanström, Sebastian (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

Johansson, Fredrik (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

Andruszkiewicz, Aneta (author): Uppsala universitet,Fysikalisk kemi

Zhang, Xiaoliang (author): Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China.

Giangrisostomi, Erika (author): Helmholtz Zentrum Berlin GmbH, Inst Methods & Instrumentat Synchrotron Radiat Re, Albert Einstein Str 15, D-12489 Berlin, Germany.

Ovsyannikov, Ruslan (author): Helmholtz Zentrum Berlin GmbH, Inst Methods & Instrumentat Synchrotron Radiat Re, Albert Einstein Str 15, D-12489 Berlin, Germany.

Foehlisch, Alexander (author): Helmholtz Zentrum Berlin GmbH, Inst Methods & Instrumentat Synchrotron Radiat Re, Albert Einstein Str 15, D-12489 Berlin, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24 25, D-14476 Potsdam, Germany.

Svensson, Svante, 1947- (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik,Uppsala Berlin Joint Lab Next Generat Photoelect, Albert Einstein Str 15, D-12489 Berlin, Germany.

Mårtensson, Nils, 1949- (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik,Uppsala Berlin Joint Lab Next Generat Photoelect, Albert Einstein Str 15, D-12489 Berlin, Germany.

Johansson, Erik (author): Uppsala universitet,Fysikalisk kemi

Lindblad, Andreas (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

Rensmo, Håkan (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

Cappel, Ute B. (author): KTH,Tillämpad fysikalisk kemi,KTH Royal Inst Technol, Div Appl Phys Chem, Dept Chem, S-10044 Stockholm, Sweden.

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2020-12-31
2020
English.
In: Scientific Reports. - : Springer Nature. - 2045-2322. ; 10:1

Related links:: https://doi.org/10.1...; show more...; https://www.nature.c...; https://uu.diva-port... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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.

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NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)
NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

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By the author/editor: Sloboda, Tamara; Svanström, Sebas ...; Johansson, Fredr ...; Andruszkiewicz, ...; Zhang, Xiaoliang; Giangrisostomi, ...; show more...; Ovsyannikov, Rus ...; Foehlisch, Alexa ...; Svensson, Svante ...; Mårtensson, Nils ...; Johansson, Erik; Lindblad, Andrea ...; Rensmo, Håkan; Cappel, Ute B.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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By the university: Royal Institute of Technology; Uppsala University

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