Programming interfacial energetic offsets and charge transfer in β-Pb0.33V2O5/quantum-dot heterostructures: Tuning valence-band edges to overlap with midgap states
Abstract
Here, semiconductor heterostructures for solar energy conversion interface light-harvesting semiconductor nanoparticles with wide-band-gap semiconductors that serve as charge acceptors. In such heterostructures, the kinetics of charge separation depend on the thermodynamic driving force, which is dictated by energetic offsets across the interface. A recently developed promising platform interfaces semiconductor quantum dots (QDs) with ternary vanadium oxides that have characteristic midgap states situated between the valence and conduction bands. In this work, we have prepared CdS/β-Pb0.33V2O5 heterostructures by both linker-assisted assembly and surface precipitation and contrasted these materials with CdSe/β-Pb0.33V2O5 heterostructures prepared by the same methods. Increased valence-band (VB) edge onsets in X-ray photoelectron spectra for CdS/β-Pb0.33V2O5 heterostructures relative to CdSe/β-Pb0.33V2O5 heterostructures suggest a positive shift in the VB edge potential and, therefore, an increased driving force for the photoinduced transfer of holes to the midgap state of β-Pb0.33V2O5. This approach facilitates a ca. 0.40 eV decrease in the thermodynamic barrier for hole injection from the VB edge of QDs suggesting an important design parameter. Transient absorption spectroscopy experiments provide direct evidence of hole transfer from photoexcited CdS QDs to the midgap states of β-Pb0.33V2O5 NWs, along with electron transfer into the conduction band of the β-Pb0.33V2O5 NWs. Hole transfer ismore »
- Authors:
-
- Texas A & M Univ., College Station, TX (United States)
- The State Univ. of New York, Buffalo, NY (United States)
- Binghamton Univ., Binghamton, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1347377
- Report Number(s):
- BNL-113661-2017-JA
Journal ID: ISSN 1932-7447; R&D Project: 16063/16058; KC0403020
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 51; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; charge transfer dynamics; quantum dots; semiconductor heterostructures; solar energy conversion; transient absorption; Center for Functional Nanomaterials
Citation Formats
Pelcher, Kate E., Milleville, Christopher C., Wangoh, Linda, Cho, Junsang, Sheng, Aaron, Chauhan, Saurabh, Sfeir, Matthew Y., Piper, Louis F. J., Watson, David F., and Banerjee, Sarbajit. Programming interfacial energetic offsets and charge transfer in β-Pb0.33V2O5/quantum-dot heterostructures: Tuning valence-band edges to overlap with midgap states. United States: N. p., 2016.
Web. doi:10.1021/acs.jpcc.6b10863.
Pelcher, Kate E., Milleville, Christopher C., Wangoh, Linda, Cho, Junsang, Sheng, Aaron, Chauhan, Saurabh, Sfeir, Matthew Y., Piper, Louis F. J., Watson, David F., & Banerjee, Sarbajit. Programming interfacial energetic offsets and charge transfer in β-Pb0.33V2O5/quantum-dot heterostructures: Tuning valence-band edges to overlap with midgap states. United States. https://doi.org/10.1021/acs.jpcc.6b10863
Pelcher, Kate E., Milleville, Christopher C., Wangoh, Linda, Cho, Junsang, Sheng, Aaron, Chauhan, Saurabh, Sfeir, Matthew Y., Piper, Louis F. J., Watson, David F., and Banerjee, Sarbajit. Tue .
"Programming interfacial energetic offsets and charge transfer in β-Pb0.33V2O5/quantum-dot heterostructures: Tuning valence-band edges to overlap with midgap states". United States. https://doi.org/10.1021/acs.jpcc.6b10863. https://www.osti.gov/servlets/purl/1347377.
@article{osti_1347377,
title = {Programming interfacial energetic offsets and charge transfer in β-Pb0.33V2O5/quantum-dot heterostructures: Tuning valence-band edges to overlap with midgap states},
author = {Pelcher, Kate E. and Milleville, Christopher C. and Wangoh, Linda and Cho, Junsang and Sheng, Aaron and Chauhan, Saurabh and Sfeir, Matthew Y. and Piper, Louis F. J. and Watson, David F. and Banerjee, Sarbajit},
abstractNote = {Here, semiconductor heterostructures for solar energy conversion interface light-harvesting semiconductor nanoparticles with wide-band-gap semiconductors that serve as charge acceptors. In such heterostructures, the kinetics of charge separation depend on the thermodynamic driving force, which is dictated by energetic offsets across the interface. A recently developed promising platform interfaces semiconductor quantum dots (QDs) with ternary vanadium oxides that have characteristic midgap states situated between the valence and conduction bands. In this work, we have prepared CdS/β-Pb0.33V2O5 heterostructures by both linker-assisted assembly and surface precipitation and contrasted these materials with CdSe/β-Pb0.33V2O5 heterostructures prepared by the same methods. Increased valence-band (VB) edge onsets in X-ray photoelectron spectra for CdS/β-Pb0.33V2O5 heterostructures relative to CdSe/β-Pb0.33V2O5 heterostructures suggest a positive shift in the VB edge potential and, therefore, an increased driving force for the photoinduced transfer of holes to the midgap state of β-Pb0.33V2O5. This approach facilitates a ca. 0.40 eV decrease in the thermodynamic barrier for hole injection from the VB edge of QDs suggesting an important design parameter. Transient absorption spectroscopy experiments provide direct evidence of hole transfer from photoexcited CdS QDs to the midgap states of β-Pb0.33V2O5 NWs, along with electron transfer into the conduction band of the β-Pb0.33V2O5 NWs. Hole transfer is substantially faster and occurs at <1-ps time scales, whereas completion of electron transfer requires 5—30 ps depending on the nature of the interface. The differentiated time scales of electron and hole transfer, which are furthermore tunable as a function of the mode of attachment of QDs to NWs, provide a vital design tool for designing architectures for solar energy conversion. More generally, the approach developed here suggests that interfacing semiconductor QDs with transition-metal oxide NWs exhibiting intercalative midgap states yields a versatile platform wherein the thermodynamics and kinetics of charge transfer can be systematically modulated to improve the efficiency of charge separation across interfaces.},
doi = {10.1021/acs.jpcc.6b10863},
journal = {Journal of Physical Chemistry. C},
number = 51,
volume = 120,
place = {United States},
year = {Tue Dec 06 00:00:00 EST 2016},
month = {Tue Dec 06 00:00:00 EST 2016}
}
Web of Science
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Works referencing / citing this record:
Type-II heterostructures of α -V 2 O 5 nanowires interfaced with cadmium chalcogenide quantum dots: Programmable energetic offsets, ultrafast charge transfer, and photocatalytic hydrogen evolution
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