Field emission analysis of band bending in donor/acceptor heterojunction

The donor/acceptor heterojunction plays an important role in organic solar cells. An investigation of band bending in the donor/acceptor heterojunction is helpful in analysis of the charge transport behavior and for the improvement of the device performance. In this work, we report an approach for d...

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Veröffentlicht in:Journal of applied physics 2016-06, Vol.119 (24)
Hauptverfasser: Xing, Yingjie, Li, Shuai, Wang, Guiwei, Zhao, Tianjiao, Zhang, Gengmin
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container_issue 24
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Li, Shuai
Wang, Guiwei
Zhao, Tianjiao
Zhang, Gengmin
description The donor/acceptor heterojunction plays an important role in organic solar cells. An investigation of band bending in the donor/acceptor heterojunction is helpful in analysis of the charge transport behavior and for the improvement of the device performance. In this work, we report an approach for detection of band bending in a donor/acceptor heterojunction that has been prepared on a small and sharp tungsten tip. In situ field emission measurements are performed after the deposition process, and a linear Fowler-Nordheim plot is obtained from the fresh organic film surface. The thickness-dependent work function is then measured in the layer-by-layer deposited heterojunction. Several different types of heterojunction (zinc phthalocyanine (ZnPc)/C60, copper phthalocyanine (CuPc)/3,4,9,10-perylenetetracarboxylic bisbenzimidazole, and CuPc/C60) are fabricated and analyzed. The different charge transfer directions in the heterojunctions are distinguished by field emission measurements. The calculation method used to determine the band bending is then discussed in detail. A triple layer heterojunction (C60/ZnPc/CuPc) is also analyzed using this method. A small amount of band bending is measured in the outer CuPc layer. This method provides an independent reference method for determination of the band bending in an organic heterojunction that will complement photoemission spectroscopy and current-voltage measurement methods.
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An investigation of band bending in the donor/acceptor heterojunction is helpful in analysis of the charge transport behavior and for the improvement of the device performance. In this work, we report an approach for detection of band bending in a donor/acceptor heterojunction that has been prepared on a small and sharp tungsten tip. In situ field emission measurements are performed after the deposition process, and a linear Fowler-Nordheim plot is obtained from the fresh organic film surface. The thickness-dependent work function is then measured in the layer-by-layer deposited heterojunction. Several different types of heterojunction (zinc phthalocyanine (ZnPc)/C60, copper phthalocyanine (CuPc)/3,4,9,10-perylenetetracarboxylic bisbenzimidazole, and CuPc/C60) are fabricated and analyzed. The different charge transfer directions in the heterojunctions are distinguished by field emission measurements. The calculation method used to determine the band bending is then discussed in detail. A triple layer heterojunction (C60/ZnPc/CuPc) is also analyzed using this method. A small amount of band bending is measured in the outer CuPc layer. 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subjects Applied physics
BENDING
Buckminsterfullerene
CALCULATION METHODS
Charge transfer
CHARGE TRANSPORT
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPLEXES
ELECTRIC POTENTIAL
Electrical measurement
Emission analysis
FIELD EMISSION
Fullerenes
HETEROJUNCTIONS
LAYERS
Measurement methods
Organic chemistry
ORGANIC SOLAR CELLS
Photoelectric emission
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
Photovoltaic cells
PHTHALOCYANINES
Solar cells
SURFACES
THICKNESS
TUNGSTEN
WORK FUNCTIONS
ZINC
title Field emission analysis of band bending in donor/acceptor heterojunction
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