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Title: Cesium doping at C{sub 60}/rubrene heterointerfaces for improving the performance of organic light- and current-generating devices

Abstract

This study examined the effect of adding cesium (Cs) at C{sub 60}/rubrene heterointerfaces by using synchrotron-radiation photoelectron spectroscopy. A C{sub 60}/rubrene heterostructure is the basis of a novel organic dual device found to facilitate efficient integration of both electroluminescent and photovoltaic functions. With Cs doping, the interfacial dipole potential was considerably enlarged, as was the separation between the lowest unoccupied molecular orbital of C{sub 60} and the highest occupied molecular orbital of rubrene. However, the energy-level diagram indicated that a high Cs concentration prevents the formation of photoexcitons. By contrast, adding a small amount of Cs can effectively improve the efficiency of light- and current-generating devices. In particular, the deficiency of the dopants at the heterointerface may benefit the survival of photoexcitons.

Authors:
; ;  [1];  [2];  [3]
  1. Department of Electrophysics, National Chiayi University, Chiayi 60004, Taiwan (China)
  2. Department of Material Science, National Chiao-Tung University, Hsinchu 30076, Taiwan (China)
  3. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)
Publication Date:
OSTI Identifier:
22399237
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CESIUM; CONCENTRATION RATIO; DIPOLES; DOPED MATERIALS; ELECTROLUMINESCENCE; ENERGY LEVELS; EXCITONS; FULLERENES; HETEROJUNCTIONS; INTERFACES; MOLECULAR ORBITAL METHOD; PERFORMANCE; PHOTOELECTRON SPECTROSCOPY; PHOTOVOLTAIC EFFECT; POTENTIALS; SYNCHROTRON RADIATION; VISIBLE RADIATION

Citation Formats

Cheng, Chiu-Ping, E-mail: cpcheng@mail.ncyu.edu.tw, Lu, Meng-Han, Chu, Yu-Ya, Wei, Ching-Hsuan, and Pi, Tun-Wen. Cesium doping at C{sub 60}/rubrene heterointerfaces for improving the performance of organic light- and current-generating devices. United States: N. p., 2015. Web. doi:10.1063/1.4905547.
Cheng, Chiu-Ping, E-mail: cpcheng@mail.ncyu.edu.tw, Lu, Meng-Han, Chu, Yu-Ya, Wei, Ching-Hsuan, & Pi, Tun-Wen. Cesium doping at C{sub 60}/rubrene heterointerfaces for improving the performance of organic light- and current-generating devices. United States. doi:10.1063/1.4905547.
Cheng, Chiu-Ping, E-mail: cpcheng@mail.ncyu.edu.tw, Lu, Meng-Han, Chu, Yu-Ya, Wei, Ching-Hsuan, and Pi, Tun-Wen. Wed . "Cesium doping at C{sub 60}/rubrene heterointerfaces for improving the performance of organic light- and current-generating devices". United States. doi:10.1063/1.4905547.
@article{osti_22399237,
title = {Cesium doping at C{sub 60}/rubrene heterointerfaces for improving the performance of organic light- and current-generating devices},
author = {Cheng, Chiu-Ping, E-mail: cpcheng@mail.ncyu.edu.tw and Lu, Meng-Han and Chu, Yu-Ya and Wei, Ching-Hsuan and Pi, Tun-Wen},
abstractNote = {This study examined the effect of adding cesium (Cs) at C{sub 60}/rubrene heterointerfaces by using synchrotron-radiation photoelectron spectroscopy. A C{sub 60}/rubrene heterostructure is the basis of a novel organic dual device found to facilitate efficient integration of both electroluminescent and photovoltaic functions. With Cs doping, the interfacial dipole potential was considerably enlarged, as was the separation between the lowest unoccupied molecular orbital of C{sub 60} and the highest occupied molecular orbital of rubrene. However, the energy-level diagram indicated that a high Cs concentration prevents the formation of photoexcitons. By contrast, adding a small amount of Cs can effectively improve the efficiency of light- and current-generating devices. In particular, the deficiency of the dopants at the heterointerface may benefit the survival of photoexcitons.},
doi = {10.1063/1.4905547},
journal = {Journal of Applied Physics},
number = 1,
volume = 117,
place = {United States},
year = {Wed Jan 07 00:00:00 EST 2015},
month = {Wed Jan 07 00:00:00 EST 2015}
}