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Ultrafast hot-hole injection modifies hot-electron dynamics in Au/p-GaN heterostructures

Tagliabue, Giulia (författare)
CALTECH, Thomas J Watson Lab Appl Phys, Pasadena, CA 91125 USA.;CALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA.,California Institute of Technology
DuChene, Joseph S. (författare)
CALTECH, Thomas J Watson Lab Appl Phys, Pasadena, CA 91125 USA.;CALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA.,California Institute of Technology
Abdellah, Mohamed (författare)
Uppsala University,Uppsala universitet,Fysikalisk kemi,South Valley Univ, Qena Fac Sci, Dept Chem, Qena, Egypt.,South Valley University
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Habib, Adela (författare)
Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY USA.,Rensselaer Polytechnic Institute
Gosztola, David J. (författare)
Argonne Natl Lab, Ctr Nanoscale Mat, Nanosci & Technol Div, 9700 S Cass Ave, Argonne, IL 60439 USA.,Argonne National Laboratory
Hattori, Yocefu (författare)
Uppsala University,Uppsala universitet,Fysikalisk kemi
Cheng, Wen-Hui (författare)
CALTECH, Thomas J Watson Lab Appl Phys, Pasadena, CA 91125 USA.;CALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA.,California Institute of Technology
Zheng, Kaibo (författare)
Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Technical University of Denmark
Canton, Sophie E. (författare)
ELI HU Nonprofit Ltd, ELI Alps, Szeged, Hungary.;DESY, Attosci Grp, Hamburg, Germany.,ELI-HU Non-profit Ltd,German Electron Synchrotron (DESY)
Sundararaman, Ravishankar (författare)
Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY USA.,Rensselaer Polytechnic Institute
Sá, Jacinto (författare)
Uppsala University,Uppsala universitet,Fysikalisk kemi,Polish Acad Sci, Inst Phys Chem, Warsaw, Poland.,Institute of Physical Chemistry of the Polish Academy of Sciences
Atwater, Harry A. (författare)
CALTECH, Thomas J Watson Lab Appl Phys, Pasadena, CA 91125 USA.;CALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA.,California Institute of Technology
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CALTECH, Thomas J Watson Lab Appl Phys, Pasadena, CA 91125 USA;CALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA. California Institute of Technology (creator_code:org_t)
2020-07-27
2020
Engelska.
Ingår i: Nature Materials. - : Springer Nature. - 1476-1122 .- 1476-4660. ; 19:12, s. 1312-1318
Relaterad länk:
https://authors.libr...
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http://dx.doi.org/10...
https://urn.kb.se/re...
https://doi.org/10.1...
https://lup.lub.lu.s...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • A fundamental understanding of hot-carrier dynamics in photo-excited metal nanostructures is needed to unlock their potential for photodetection and photocatalysis. Despite numerous studies on the ultrafast dynamics of hot electrons, so far, the temporal evolution of hot holes in metal-semiconductor heterostructures remains unknown. Here, we report ultrafast (t < 200 fs) hot-hole injection from Au nanoparticles into the valence band of p-type GaN. The removal of hot holes from below the Au Fermi level is observed to substantially alter the thermalization dynamics of hot electrons, reducing the peak electronic temperature and the electron-phonon coupling time of the Au nanoparticles. First-principles calculations reveal that hot-hole injection modifies the relaxation dynamics of hot electrons in Au nanoparticles by modulating the electronic structure of the metal on timescales commensurate with electron-electron scattering. These results advance our understanding of hot-hole dynamics in metal-semiconductor heterostructures and offer additional strategies for manipulating the dynamics of hot carriers on ultrafast timescales. Photo-excited gold nanoparticles are shown to provide ultrafast and efficient hot-hole injection to the valence band of p-type GaN, substantially altering hot-electron dynamics in the nanoparticles and forming a basis to design hot-hole-based optoelectronics.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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