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Graphene to replace ITO used in OLED is that possible?
by：Transon
2021-01-08
In the continuous development of transparent conductor, graphene as indium tin oxide (
ITO)
Alternatives are more and more be taken seriously, especially for those who are highly portable, and the development of flexible devices.
however, due to the technology is not mature, the application of graphene as a transparent electrode is affected by the huge. Now, scientists from the philips research institute and the university of Cambridge was prepared on the basis of graphene organic light-emitting diode ( OLED) , compared with the advanced ITO device, can show more excellent performance.
graphene has high optical transparency and electron mobility, making it a very suitable for the application of photoelectric materials, such as the touch screen, LED and solar cells. At present, these devices are mainly through the preparation of ITO.
however, to be applied to the next generation device transparent conductor ( TC) Substitute demand is increasing, because of the price of indium element increasing and strong regional restriction, and the development trend of flexible devices market.
graphene has high carrier mobility, but usually have low carrier concentration. So as the overall performance of the electrode needs to be improved, by doping to increase the number of charge carriers available. Must be careful to avoid the damage of graphene doping process high optical transparency, because this is as an important part of the properties of the transparent electrode.
effective carrier exchange between the active layer and the electrode to the desired photoelectric function is very important. Active materials and electrode electronic band bent and modulation between each other, so the photoelectric properties of the final device for fine-tuning. Therefore, it is necessary to study exchange efficiency of the carrier in complete photoelectric device and band bending.
in optoelectronic devices such as OLED, in order to improve the flow of the carrier and the band alignment and graphene doped, metal oxide thin films are often used as graphene electrodes and the active material of the middle layer. There are many research reports about metal oxides. However, a study published recently in the journal ScientificReports, few studies focused on the load transfer mechanism of the micro features.
in this called & quot; The introduction of metal oxide OLED graphene electrode charge transfer doping and band arrangement & quot; Study, the team studied the CVD deposition on the glass or oxide matrix directly the graphene layer.
from scientists at the university of Cambridge and philips research center, shows the preparation of graphene OLED laminated, its efficiency is better than standard ITO device.
in the basic of OLED laminated and the introduction of molybdenum oxide graphene electrodes ( MoO3) The middle layer. Through light stimulate research, found that the combination of these materials has led to band bending.
in the end, the conduction band of MoO3 relative to the Fermi level of graphene bent down, thus the ideal level of led to suitable for charge transfer. By optimizing the structure of MoO3 film thickness can obtain higher efficiency than high-tech ITO reference device.
conclusion
the study for the energy band engineering design of the graphene opens the new way. This, in turn, will lay foundation for the wide application of graphene, especially for organic optoelectronics. The study is performed by the European plan GRAFOL, the aim is to roll to roll method of preparation of graphite.
however, due to the technology is not mature, the application of graphene as a transparent electrode is affected by the huge. Now, scientists from the philips research institute and the university of Cambridge was prepared on the basis of graphene organic light-emitting diode ( OLED) , compared with the advanced ITO device, can show more excellent performance.
graphene has high optical transparency and electron mobility, making it a very suitable for the application of photoelectric materials, such as the touch screen, LED and solar cells. At present, these devices are mainly through the preparation of ITO.
however, to be applied to the next generation device transparent conductor ( TC) Substitute demand is increasing, because of the price of indium element increasing and strong regional restriction, and the development trend of flexible devices market.
graphene has high carrier mobility, but usually have low carrier concentration. So as the overall performance of the electrode needs to be improved, by doping to increase the number of charge carriers available. Must be careful to avoid the damage of graphene doping process high optical transparency, because this is as an important part of the properties of the transparent electrode.
effective carrier exchange between the active layer and the electrode to the desired photoelectric function is very important. Active materials and electrode electronic band bent and modulation between each other, so the photoelectric properties of the final device for fine-tuning. Therefore, it is necessary to study exchange efficiency of the carrier in complete photoelectric device and band bending.
in optoelectronic devices such as OLED, in order to improve the flow of the carrier and the band alignment and graphene doped, metal oxide thin films are often used as graphene electrodes and the active material of the middle layer. There are many research reports about metal oxides. However, a study published recently in the journal ScientificReports, few studies focused on the load transfer mechanism of the micro features.
in this called & quot; The introduction of metal oxide OLED graphene electrode charge transfer doping and band arrangement & quot; Study, the team studied the CVD deposition on the glass or oxide matrix directly the graphene layer.
from scientists at the university of Cambridge and philips research center, shows the preparation of graphene OLED laminated, its efficiency is better than standard ITO device.
in the basic of OLED laminated and the introduction of molybdenum oxide graphene electrodes ( MoO3) The middle layer. Through light stimulate research, found that the combination of these materials has led to band bending.
in the end, the conduction band of MoO3 relative to the Fermi level of graphene bent down, thus the ideal level of led to suitable for charge transfer. By optimizing the structure of MoO3 film thickness can obtain higher efficiency than high-tech ITO reference device.
conclusion
the study for the energy band engineering design of the graphene opens the new way. This, in turn, will lay foundation for the wide application of graphene, especially for organic optoelectronics. The study is performed by the European plan GRAFOL, the aim is to roll to roll method of preparation of graphite.
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