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Title: Field emission analysis of band bending in donor/acceptor heterojunction

Abstract

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.

Authors:
; ; ; ;  [1]
  1. Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
22596617
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 24; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BENDING; CALCULATION METHODS; CHARGE TRANSPORT; COPPER COMPLEXES; ELECTRIC POTENTIAL; FIELD EMISSION; FILMS; HETEROJUNCTIONS; LAYERS; ORGANIC SOLAR CELLS; PHOTOELECTRON SPECTROSCOPY; PHOTOEMISSION; PHTHALOCYANINES; SURFACES; THICKNESS; TUNGSTEN; WORK FUNCTIONS; ZINC

Citation Formats

Xing, Yingjie, E-mail: xingyj@pku.edu.cn, Li, Shuai, Wang, Guiwei, Zhao, Tianjiao, and Zhang, Gengmin. Field emission analysis of band bending in donor/acceptor heterojunction. United States: N. p., 2016. Web. doi:10.1063/1.4955219.
Xing, Yingjie, E-mail: xingyj@pku.edu.cn, Li, Shuai, Wang, Guiwei, Zhao, Tianjiao, & Zhang, Gengmin. Field emission analysis of band bending in donor/acceptor heterojunction. United States. doi:10.1063/1.4955219.
Xing, Yingjie, E-mail: xingyj@pku.edu.cn, Li, Shuai, Wang, Guiwei, Zhao, Tianjiao, and Zhang, Gengmin. 2016. "Field emission analysis of band bending in donor/acceptor heterojunction". United States. doi:10.1063/1.4955219.
@article{osti_22596617,
title = {Field emission analysis of band bending in donor/acceptor heterojunction},
author = {Xing, Yingjie, E-mail: xingyj@pku.edu.cn and Li, Shuai and Wang, Guiwei and Zhao, Tianjiao and Zhang, Gengmin},
abstractNote = {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.},
doi = {10.1063/1.4955219},
journal = {Journal of Applied Physics},
number = 24,
volume = 119,
place = {United States},
year = 2016,
month = 6
}