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Mapping Charge Distribution in Single PbS Core - CdS Arm Nano-Multipod Heterostructures by Off-Axis Electron Holography
被引:9
作者:

Chalasani, Rajesh
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Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel
Tel Aviv Univ, Res Ctr Nanosci & Nanotechnol, IL-6997801 Tel Aviv, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

Pekin, Alexander
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Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel
Ben Gurion Univ Negev, Ilse Katz Inst Nanoscale Sci & Technol, IL-84105 Beer Sheva, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

Rabkin, Alexander
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Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel
Ben Gurion Univ Negev, Ilse Katz Inst Nanoscale Sci & Technol, IL-84105 Beer Sheva, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

Abutbul, Ran E.
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Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel
Ben Gurion Univ Negev, Ilse Katz Inst Nanoscale Sci & Technol, IL-84105 Beer Sheva, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

Dieguez, Oswaldo
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Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel
Tel Aviv Univ, Raymond & Beverly Sackler Ctr Computat Mol & Mat, IL-6997801 Tel Aviv, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

Kauffmann, Yaron
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Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-32000 Haifa, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel

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Kohn, Amit
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Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel
Tel Aviv Univ, Res Ctr Nanosci & Nanotechnol, IL-6997801 Tel Aviv, Israel Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel
机构:
[1] Tel Aviv Univ, Dept Mat Sci & Engn, IL-6997801 Tel Aviv, Israel
[2] Tel Aviv Univ, Res Ctr Nanosci & Nanotechnol, IL-6997801 Tel Aviv, Israel
[3] Tel Aviv Univ, Raymond & Beverly Sackler Ctr Computat Mol & Mat, IL-6997801 Tel Aviv, Israel
[4] Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel
[5] Ben Gurion Univ Negev, Ilse Katz Inst Nanoscale Sci & Technol, IL-84105 Beer Sheva, Israel
[6] Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-32000 Haifa, Israel
基金:
以色列科学基金会;
关键词:
PbS core-CdS arm nanomultipod heterostructures;
off-axis electron holography;
electrostatic phase mapping;
built-in potential;
3D electrostatic simulations;
focal series exit wave phase reconstruction;
TRANSISTORS;
SCATTERING;
JUNCTIONS;
GROWTH;
D O I:
10.1021/acs.nanolett.6b04957
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
We synthesized PbS core-CdS arm nanomultipod heterostructures (NMHs) that exhibit PbS{111}/CdS{0002} epitaxial relations. The PbS CdS interface is chemically sharp as determined by aberration corrected transmission electron microscopy (TEM) and compared to density functional theory (DFT) calculations. Ensemble fluorescence measurements show quenching of the optical signal from the CdS arms indicating charge separation due to the heterojunction with PbS. A finite-element three-dimensional (3D) calculation of the Poisson equation shows a type-I heterojunction, which would prevent recombination in the CdS arm after optical excitation. To examine charge redistribution, we used off-axis electron holography (OAEH) in the TEM to map the electrostatic potential across an individual heterojunction. Indeed, a built-in potential of 500 mV is estimated across the junction, though as opposed to the thermal equilibrium calculations significant accumulation of positive charge at the CdS side of the interface is detected. We conclude that the NMH multipod geometry prevents efficient removal of generated charge carriers by the high energy electrons of the TEM. Simulations of generated electron hole pairs in the insulated CdS arm of the NMH indeed show charge accumulation in agreement with the experimental measurements. Thus, we show that OAEH can be used as a complementary methodology to ensemble measurements by mapping the charge distribution in single NMHs with complex geometries.
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页码:2778 / 2787
页数:10
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Yoo, Jinkyoung
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Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

He, Yang
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Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Colby, Robert J.
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Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Barker, Josh E.
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Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Gu, Meng
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Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Mao, Scott X.
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Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Wang, Chongmin
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Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Picraux, S. T.
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Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

Smith, David J.
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Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

McCartney, Martha R.
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Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA