Elucidating the role of current injection on the influence of open-circuit voltage in small-molecule organic photovoltaic devices: From the aspects of charge transfer and electroluminescent spectrum

Wei Cheng Su, Chih Chien Lee, Wen Chang Chang, Ya Ze Li, Yi Sheng Shu, Jhih Yan Guo, Chien Feng Chiu, Shun Wei Liu

研究成果: 雜誌貢獻文章

4 引文 (Scopus)

摘要

We demonstrate that the open-circuit voltage (VOC) of organic photovoltaic (OPV) devices composed of rubrene and C60 can be considerably different when the anode and active layer are changed. Two types of anodes and active layers were compared. In plasma-treated indium-tin-oxide (ITO) OPV devices, the parameter VOC exhibits an improvement from 0.68 V to 0.76 V when the device structure is varied from a bilayer to a mixed structure. However, in the OPV devices that use ITO/MoO3 as the anode, a similar VOC is observed regardless of the device structure. A series of temperature-dependent measurements are conducted to investigate these results. The calculation of barrier height at the rubrene/C60 (or rubrene:C60) interface yields the prediction of VOC, suggesting that an excess energetic loss occurs in the mixed structures. The electroluminescent (EL) spectra of these devices show that the mixed structure can completely quench the EL of rubrene single layer. A broad band of the charge transfer (CT) emission is observed clearly. A temperature-dependent measurement for the extracting injection barrier is conducted and shows that the mixed structure is favorable for the hole current injection. The CT properties are obtained using the external quantum efficiency and EL spectra of the OPV devices. We find that the nonradiative recombination loss is highly correlated with the injected current; the lower the injection barrier induced the less the nonradiative recombination loss. Therefore, the parameter VOC can be improved when the injected current is increased.
原文英語
頁(從 - 到)178-186
頁數9
期刊Organic Electronics: physics, materials, applications
33
DOIs
出版狀態已發佈 - 六月 1 2016
對外發佈Yes

指紋

Open circuit voltage
open circuit voltage
Volatile organic compounds
Charge transfer
volatile organic compounds
charge transfer
injection
Molecules
Anodes
molecules
Tin oxides
Indium
anodes
indium oxides
tin oxides
Quantum efficiency
Plasmas
Temperature
quantum efficiency
rubrene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

引用此文

Elucidating the role of current injection on the influence of open-circuit voltage in small-molecule organic photovoltaic devices : From the aspects of charge transfer and electroluminescent spectrum. / Su, Wei Cheng; Lee, Chih Chien; Chang, Wen Chang; Li, Ya Ze; Shu, Yi Sheng; Guo, Jhih Yan; Chiu, Chien Feng; Liu, Shun Wei.

於: Organic Electronics: physics, materials, applications, 卷 33, 01.06.2016, p. 178-186.

研究成果: 雜誌貢獻文章

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abstract = "We demonstrate that the open-circuit voltage (VOC) of organic photovoltaic (OPV) devices composed of rubrene and C60 can be considerably different when the anode and active layer are changed. Two types of anodes and active layers were compared. In plasma-treated indium-tin-oxide (ITO) OPV devices, the parameter VOC exhibits an improvement from 0.68 V to 0.76 V when the device structure is varied from a bilayer to a mixed structure. However, in the OPV devices that use ITO/MoO3 as the anode, a similar VOC is observed regardless of the device structure. A series of temperature-dependent measurements are conducted to investigate these results. The calculation of barrier height at the rubrene/C60 (or rubrene:C60) interface yields the prediction of VOC, suggesting that an excess energetic loss occurs in the mixed structures. The electroluminescent (EL) spectra of these devices show that the mixed structure can completely quench the EL of rubrene single layer. A broad band of the charge transfer (CT) emission is observed clearly. A temperature-dependent measurement for the extracting injection barrier is conducted and shows that the mixed structure is favorable for the hole current injection. The CT properties are obtained using the external quantum efficiency and EL spectra of the OPV devices. We find that the nonradiative recombination loss is highly correlated with the injected current; the lower the injection barrier induced the less the nonradiative recombination loss. Therefore, the parameter VOC can be improved when the injected current is increased.",
keywords = "Charge transfer, Current injection, Electroluminescence, Open-circuit voltage, Small-molecule organic photovoltaic",
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T1 - Elucidating the role of current injection on the influence of open-circuit voltage in small-molecule organic photovoltaic devices

T2 - From the aspects of charge transfer and electroluminescent spectrum

AU - Su, Wei Cheng

AU - Lee, Chih Chien

AU - Chang, Wen Chang

AU - Li, Ya Ze

AU - Shu, Yi Sheng

AU - Guo, Jhih Yan

AU - Chiu, Chien Feng

AU - Liu, Shun Wei

PY - 2016/6/1

Y1 - 2016/6/1

N2 - We demonstrate that the open-circuit voltage (VOC) of organic photovoltaic (OPV) devices composed of rubrene and C60 can be considerably different when the anode and active layer are changed. Two types of anodes and active layers were compared. In plasma-treated indium-tin-oxide (ITO) OPV devices, the parameter VOC exhibits an improvement from 0.68 V to 0.76 V when the device structure is varied from a bilayer to a mixed structure. However, in the OPV devices that use ITO/MoO3 as the anode, a similar VOC is observed regardless of the device structure. A series of temperature-dependent measurements are conducted to investigate these results. The calculation of barrier height at the rubrene/C60 (or rubrene:C60) interface yields the prediction of VOC, suggesting that an excess energetic loss occurs in the mixed structures. The electroluminescent (EL) spectra of these devices show that the mixed structure can completely quench the EL of rubrene single layer. A broad band of the charge transfer (CT) emission is observed clearly. A temperature-dependent measurement for the extracting injection barrier is conducted and shows that the mixed structure is favorable for the hole current injection. The CT properties are obtained using the external quantum efficiency and EL spectra of the OPV devices. We find that the nonradiative recombination loss is highly correlated with the injected current; the lower the injection barrier induced the less the nonradiative recombination loss. Therefore, the parameter VOC can be improved when the injected current is increased.

AB - We demonstrate that the open-circuit voltage (VOC) of organic photovoltaic (OPV) devices composed of rubrene and C60 can be considerably different when the anode and active layer are changed. Two types of anodes and active layers were compared. In plasma-treated indium-tin-oxide (ITO) OPV devices, the parameter VOC exhibits an improvement from 0.68 V to 0.76 V when the device structure is varied from a bilayer to a mixed structure. However, in the OPV devices that use ITO/MoO3 as the anode, a similar VOC is observed regardless of the device structure. A series of temperature-dependent measurements are conducted to investigate these results. The calculation of barrier height at the rubrene/C60 (or rubrene:C60) interface yields the prediction of VOC, suggesting that an excess energetic loss occurs in the mixed structures. The electroluminescent (EL) spectra of these devices show that the mixed structure can completely quench the EL of rubrene single layer. A broad band of the charge transfer (CT) emission is observed clearly. A temperature-dependent measurement for the extracting injection barrier is conducted and shows that the mixed structure is favorable for the hole current injection. The CT properties are obtained using the external quantum efficiency and EL spectra of the OPV devices. We find that the nonradiative recombination loss is highly correlated with the injected current; the lower the injection barrier induced the less the nonradiative recombination loss. Therefore, the parameter VOC can be improved when the injected current is increased.

KW - Charge transfer

KW - Current injection

KW - Electroluminescence

KW - Open-circuit voltage

KW - Small-molecule organic photovoltaic

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