Electronic Control of Hot Electron Transport Using Modified Schottky Barriers in Metal–Semiconductor Nanodiodes

Jeon, Beomjoon; Lee, Changhwan; Park, Jeong Young

doi:10.1021/acsami.0c22108

Cited by 19 publications

(15 citation statements)

References 48 publications

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“…This indicates that the accumulation of positive charge by V O + at the metal–semiconductor interface via reverse, i.e., negative, bias and the increased trap-assisted tunneling results in an effective lowering of the Schottky barrier (Figure c), while the depletion of V O defects with forward bias reduces the tunneling probability and causes an effective increase in the Schottky barrier height (Figure b). This effect is consistent with similar reports correlating nanoscale metal–semiconductor Schottky barrier heights with defect densities. − …”

Section: Results and Discussionsupporting

confidence: 92%

Electric Field Manipulation of Defects and Schottky Barrier Control inside ZnO Nanowires

Haseman

Hui-bin

Duddella

et al. 2023

ACS Appl. Mater. Interfaces

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We directly measure the three-dimensional movement of intrinsic point defects driven by applied electric fields inside ZnO nano- and micro-wire metal–semiconductor–metal device structures. Using depth- and spatially resolved cathodoluminescence spectroscopy (CLS) in situ to map the spatial distributions of local defect densities with increasing applied bias, we drive the reversible conversion of metal–ZnO contacts from rectifying to Ohmic and back. These results demonstrate how defect movements systematically determine Ohmic and Schottky barriers to ZnO nano- and microwires and how they can account for the widely reported instability in nanowire transport. Exceeding a characteristic threshold voltage, in situ CLS reveals a current-induced thermal runaway that drives the radial diffusion of defects toward the nanowire free surface, causing VO defects to accumulate at the metal–semiconductor interfaces. In situ post- vs pre-breakdown CLS reveal micrometer-scale wire asperities, which X-ray photoelectron spectroscopy (XPS) finds to have highly oxygen-deficient surface layers that can be attributed to the migration of preexisting VO species. These findings show the importance of in-operando intrinsic point-defect migration during nanoscale electric field measurements in general. This work also demonstrates a novel method for ZnO nanowire refinement and processing.

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Section: Results and Discussionsupporting

confidence: 92%

Electric Field Manipulation of Defects and Schottky Barrier Control inside ZnO Nanowires

Haseman

Hui-bin

Duddella

et al. 2023

ACS Appl. Mater. Interfaces

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“…On the one hand, the Au NPs as plasmon can be used as energy-harvesting antennas to increase light absorption cross sections and effective optical path length of surrounding semiconductor materials due to the large scattering cross section and locally amplified electric field. ,− On the other hand, since the SPR absorption spectrum of Au NPs overlapped well with the absorption spectrum of 2D Yb-TCPP nanosheets, the PIRET can occur between Au NPs and 2D Yb-TCPP nanosheets, thereby improving the e–h formation rate and separation efficiency of 2D Yb-TCPP nanosheets (Figure ). − Besides, the hot electrons induced by plasmon resonance of Au NPs can cross the Schottky barrier and transfer to the conduction band of 2D Yb-TCPP nanosheets, which also helps to improve the photoelectrochemical signal of Au NPs/Yb-TCPP composites. ,− …”

Section: Resultsmentioning

confidence: 99%

2D MOF-Based Photoelectrochemical Aptasensor for SARS-CoV-2 Spike Glycoprotein Detection

江

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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A reliable and sensitive detection approach for SARS-CoV 2 is essential for timely infection diagnosis and transmission prevention. Here, a two-dimensional (2D) metal–organic framework (MOF)-based photoelectrochemical (PEC) aptasensor with high sensitivity and stability for SARS-CoV 2 spike glycoprotein (S protein) detection was developed. The PEC aptasensor was constructed by a plasmon-enhanced photoactive material (namely, Au NPs/Yb-TCPP) with a specific DNA aptamer against S protein. The Au NPs/Yb-TCPP fabricated by in situ growth of Au NPs on the surface of 2D Yb-TCPP nanosheets showed a high electron–hole (e–h) separation efficiency due to the enhancement effect of plasmon, resulting in excellent photoelectric performance. The modified DNA aptamer on the surface of Au NPs/Yb-TCPP can bind with S protein with high selectivity, thus decreasing the photocurrent of the system due to the high steric hindrance and low conductivity of the S protein. The established PEC aptasensor demonstrated a highly sensitive detection for S protein with a linear response range of 0.5–8 μg/mL with a detection limit of 72 ng/mL. This work presented a promising way for the detection of SARS-CoV 2, which may conduce to the impetus of clinic diagnostics.

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“…According to the pH change, the Schottky barrier height decreased by 0.03 eV, thereby increasing the chemicurrent signal five times. According to a previous report, the current signal increased three times when the Schottky barrier height decreased by 0.02 eV . Therefore, the degree of improvement of the current signal due to the decrease in the barrier height in the H 2 O 2 decomposition reaction can be quantitatively rationalized.…”

mentioning

confidence: 99%

“…In other words, in acidic solutions, the probability of electron transfer increases because the potential barrier is decreased. We recently reported on studies of controlling the Schottky barrier by applying an external bias and found that lowering the barrier by image force significantly increases the charge transfer. ,,,, Thus, in this study, more H + layers are formed on the Pt in the acidic solutions, resulting in a lower Schottky barrier. Compared to the gas phase, there are more ion layers in the liquid phase, decreasing the potential barrier and allowing for better hot electron transfer.…”

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confidence: 99%

How Hot Electron Generation at the Solid–Liquid Interface Is Different from the Solid–Gas Interface

2023

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Excitation of hot electrons by energy dissipation under exothermic chemical reactions on metal catalyst surfaces occurs at both solid−gas and solid−liquid interfaces. Despite extensive studies, a comparative operando study directly comparing electronic excitation by electronically nonadiabatic interactions at solid−gas and solid−liquid interfaces has not been reported. Herein, on the basis of our in situ techniques for monitoring of energy dissipation as a chemicurrent using a Pt/n-Si nanodiode sensor, we observed the generation of hot electrons in both gas and liquid phases during H 2 O 2 decomposition. As a result of comparing the current signal and oxygen evolution rate in the two phases, surprisingly, the efficiency of reaction-induced excitation of hot electrons increased by ∼100 times at the solid−liquid interface compared to the solid−gas interface. The boost of hot electron excitation in the liquid phase is due to the presence of an ionic layer lowering the potential barrier at the junction for transferring hot electrons.

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Electronic Control of Hot Electron Transport Using Modified Schottky Barriers in Metal–Semiconductor Nanodiodes

Cited by 19 publications

References 48 publications

Electric Field Manipulation of Defects and Schottky Barrier Control inside ZnO Nanowires

Electric Field Manipulation of Defects and Schottky Barrier Control inside ZnO Nanowires

2D MOF-Based Photoelectrochemical Aptasensor for SARS-CoV-2 Spike Glycoprotein Detection

How Hot Electron Generation at the Solid–Liquid Interface Is Different from the Solid–Gas Interface

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