Ultrafast time-resolved extreme ultraviolet (XUV) photoelectron spectroscopy of hole transfer in a Zn/n-GaP Schottky junction

Marsh, Brett M.; Lamoureux, Bethany R.; Leone, Stephen R.

doi:10.1063/1.5046776

Title: Ultrafast time-resolved extreme ultraviolet (XUV) photoelectron spectroscopy of hole transfer in a Zn/n-GaP Schottky junction

Journal Article · Mon Oct 22 00:00:00 EDT 2018 · Structural Dynamics

DOI:https://doi.org/10.1063/1.5046776· OSTI ID:1616966

Marsh, Brett M. ^[1]; Lamoureux, Bethany R. ^[2]; Leone, Stephen R. ^[3]

Univ. of California, Berkeley, CA (United States); Purdue Univ., West Lafayette, IN (United States)
Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The addition of a metal overlayer to a semiconductor photocatalyst is a frequently used synthetic route to passivate the surface and, via the formation of a Schottky barrier, to enhance catalytic activity of the photocatalyst material. While it is known that Schottky junctions decrease recombination by charge separation, measurements of the depletion region dynamics have remained elusive. Here, we use ultrafast pump-probe transient photoelectron spectroscopy to measure material-specific dynamics of the Zn/n-GaP(100) system. Through photoemission measurements the Schottky barrier height is determined to be 2.1± 0.1eV at 10 monolayers of total Zn deposition. Transient photoemission measurements utilizing a 400 nm pump pulse show that, after excitation, holes are transferred from n-GaP(100) to the Zn overlayer within a few ps, as evidenced by shifts of the Zn 3d and Ga 3d core levels to higher binding energies. Within the timescale of the experiment (130 ps) no carrier recombination is observed in the junction. Furthermore, a long-lived surface photovoltage signal is observed at times >1 ms after photoexcitation. This work further exemplifies the potential of transient extreme ultraviolet photoelectron spectroscopy as a material-specific technique for the study of heterojunctions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC02-05CH11231; FA9550-14-1-0154

OSTI ID:: 1616966

Journal Information:: Structural Dynamics, Vol. 5, Issue 5; ISSN 2329-7778

Publisher:: American Crystallographic Association/AIPCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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References (32)

Ultra-thin metal films for enhanced solar absorption Ahmad, N.; Stokes, J.; Fox, N. A. Nano Energy, Vol. 1, Issue 6 https://doi.org/10.1016/j.nanoen.2012.08.004	journal	November 2012
Femtosecond Extreme Ultraviolet Photoemission Spectroscopy: Observation of Ultrafast Charge Transfer at the n-TiO ₂ /p-Si(100) Interface with Controlled TiO ₂ Oxygen Vacancies Vaida, Mihai E.; Leone, Stephen R. The Journal of Physical Chemistry C, Vol. 120, Issue 5 https://doi.org/10.1021/acs.jpcc.5b11161	journal	January 2016
Intrinsic Optical Absorption of Gallium Phosphide between 2.33 and 3.12 eV Dean, P. J.; Kaminsky, G.; Zetterstrom, R. B. Journal of Applied Physics, Vol. 38, Issue 9 https://doi.org/10.1063/1.1710170	journal	August 1967
Time-resolved HAXPES using a microfocused XFEL beam: From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics Oloff, Lars-Philip; Chainani, Ashish; Matsunami, Masaharu Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep35087	journal	October 2016
Calculated Valence-Band Densities of States and Photoemission Spectra of Diamond and Zinc-Blende Semiconductors Chelikowsky, J.; Chadi, D. J.; Cohen, Marvin L. Physical Review B, Vol. 8, Issue 6 https://doi.org/10.1103/PhysRevB.8.2786	journal	September 1973
Pump laser-induced space-charge effects in HHG-driven time- and angle-resolved photoelectron spectroscopy Oloff, L. -P.; Hanff, K.; Stange, A. Journal of Applied Physics, Vol. 119, Issue 22 https://doi.org/10.1063/1.4953643	journal	June 2016
X-ray photoemission determination of the Schottky barrier height of metal contacts to n –GaN and p –GaN Rickert, K. A.; Ellis, A. B.; Kim, Jong Kyu Journal of Applied Physics, Vol. 92, Issue 11 https://doi.org/10.1063/1.1518129	journal	December 2002
Femtosecond time-resolved core-level photoelectron spectroscopy tracking surface photovoltage transients on p –GaAs Siffalovic, P.; Drescher, M.; Heinzmann, U. Europhysics Letters (EPL), Vol. 60, Issue 6 https://doi.org/10.1209/epl/i2002-00306-3	journal	December 2002
Surface photovoltage effects in photoemission from metal-GaP(110) interfaces: Importance for band bending evaluation Alonso, M.; Cimino, R.; Horn, K. Physical Review Letters, Vol. 64, Issue 16 https://doi.org/10.1103/PhysRevLett.64.1947	journal	April 1990
Note: Binding energy scale calibration of electron spectrometers for photoelectron spectroscopy using a single sample Helander, M. G.; Greiner, M. T.; Wang, Z. B. Review of Scientific Instruments, Vol. 82, Issue 9 https://doi.org/10.1063/1.3642659	journal	September 2011
Ultrafast time resolution in scanned probe microscopies: Surface photovoltage on Si(111)–(7×7) Hamers, R. J. Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, Vol. 9, Issue 2 https://doi.org/10.1116/1.585559	journal	March 1991
Photo-Electrochemical Behaviors of Semiconductor Electrodes Coated with thin Metal Films Nakato, Yoshihiro; Ohnishi, Toshihiro; Tsubomura, Hiroshi Chemistry Letters, Vol. 4, Issue 8 https://doi.org/10.1246/cl.1975.883	journal	August 1975
Role of photocurrent in low-temperature photoemission studies of Schottky-barrier formation Hecht, M. H. Physical Review B, Vol. 41, Issue 11 https://doi.org/10.1103/PhysRevB.41.7918	journal	April 1990
Review on Synthesis and Characterization of Gallium Phosphide Aparna, A. R.; Brahmajirao, V.; Karthikeyan, T. V. Procedia Materials Science, Vol. 6 https://doi.org/10.1016/j.mspro.2014.07.150	journal	January 2014
Surface photovoltage and photoelectron spectra of GaP Kumar, Shailendra; Phase, D. M.; Porwal, Sanjay Solid State Communications, Vol. 141, Issue 5 https://doi.org/10.1016/j.ssc.2006.10.038	journal	February 2007
Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy Spencer, B. F.; Leontiadou, M. A.; Clark, P. C. J. Applied Physics Letters, Vol. 108, Issue 9 https://doi.org/10.1063/1.4943077	journal	February 2016
Time-resolved surface photovoltage measurements at $n$ -type photovoltaic surfaces: Si(111) and ZnO(10 $\bar{1}$ 0) Spencer, Ben F.; Graham, Darren M.; Hardman, Samantha J. O. Physical Review B, Vol. 88, Issue 19 https://doi.org/10.1103/PhysRevB.88.195301	journal	November 2013
Surfactant-Free, Large-Scale, Solution–Liquid–Solid Growth of Gallium Phosphide Nanowires and Their Use for Visible-Light-Driven Hydrogen Production from Water Reduction Sun, Jianwei; Liu, Chong; Yang, Peidong Journal of the American Chemical Society, Vol. 133, Issue 48 https://doi.org/10.1021/ja2083398	journal	December 2011
Amorphous TiO2 coatings stabilize Si, GaAs, and GaP photoanodes for efficient water oxidation Hu, S.; Shaner, M. R.; Beardslee, J. A. Science, Vol. 344, Issue 6187 https://doi.org/10.1126/science.1251428	journal	May 2014
The physics and chemistry of the Schottky barrier height Tung, Raymond T. Applied Physics Reviews, Vol. 1, Issue 1 https://doi.org/10.1063/1.4858400	journal	January 2014
Electron propagation from a photo-excited surface: implications for time-resolved photoemission Yang, S. -L.; Sobota, J. A.; Kirchmann, P. S. Applied Physics A, Vol. 116, Issue 1 https://doi.org/10.1007/s00339-013-8154-9	journal	November 2013
Nonmetal to Metal Transition and Ultrafast Charge Carrier Dynamics of Zn Clusters on p-Si(100) by fs-XUV Photoemission Spectroscopy Vaida, Mihai E.; Marsh, Brett M.; Leone, Stephen R. Nano Letters, Vol. 18, Issue 7 https://doi.org/10.1021/acs.nanolett.8b00700	journal	June 2018
Efficient water reduction with gallium phosphide nanowires Standing, Anthony; Assali, Simone; Gao, Lu Nature Communications, Vol. 6, Issue 1 https://doi.org/10.1038/ncomms8824	journal	July 2015
Surface photovoltage effects on p -GaAs (100) from core-level photoelectron spectroscopy using synchrotron radiation and a laser Tanaka, S.; More, S. D.; Murakami, J. Physical Review B, Vol. 64, Issue 15 https://doi.org/10.1103/PhysRevB.64.155308	journal	September 2001
Investigation of Optical Transmission in Thin Metal Films Axelevitch, A.; Gorenstein, B.; Golan, G. Physics Procedia, Vol. 32 https://doi.org/10.1016/j.phpro.2012.03.510	journal	January 2012
The growth and properties of Al and AlN films on GaN(0001)–(1×1) Bermudez, V. M.; Jung, T. M.; Doverspike, K. Journal of Applied Physics, Vol. 79, Issue 1 https://doi.org/10.1063/1.360917	journal	January 1996
Solar Hydrogen Production Using Molecular Catalysts Immobilized on Gallium Phosphide (111)A and (111)B Polymer-Modified Photocathodes Beiler, Anna M.; Khusnutdinova, Diana; Jacob, Samuel I. ACS Applied Materials & Interfaces, Vol. 8, Issue 15 https://doi.org/10.1021/acsami.6b01557	journal	April 2016
Band Gap of Gallium Phosphide from 0 to 900°K and Light Emission from Diodes at High Temperatures Lorenz, M. R.; Pettit, G. D.; Taylor, R. C. Physical Review, Vol. 171, Issue 3 https://doi.org/10.1103/PhysRev.171.876	journal	July 1968
Observation of Diffusion and Tunneling Recombination of Dye-Photoinjected Electrons in Ultrathin TiO ₂ Layers by Surface Photovoltage Transients Mora-Seró, Iván; Dittrich, Thomas; Belaidi, Abdelhak The Journal of Physical Chemistry B, Vol. 109, Issue 31 https://doi.org/10.1021/jp058128w	journal	August 2005
Measuring the Surface Photovoltage of a Schottky Barrier under Intense Light Conditions: Zn/p-Si(100) by Laser Time-Resolved Extreme Ultraviolet Photoelectron Spectroscopy Marsh, Brett M.; Vaida, Mihai E.; Cushing, Scott K. The Journal of Physical Chemistry C, Vol. 121, Issue 40 https://doi.org/10.1021/acs.jpcc.7b06406	journal	September 2017
Ultra-Thin Metal Films for Enhanced Solar Absorption Ahmad, N.; Stokes, J.; Fox, N. A. arXiv https://doi.org/10.48550/arxiv.1202.6603	preprint	January 2012
Electron propagation from a photo-excited surface: implications for time-resolved photoemission Yang, Shuolong; Sobota, Jonathan A.; Kirchmann, Patrick S. arXiv https://doi.org/10.48550/arxiv.1312.1392	text	January 2013