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1 2024

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Characterisation of a graphene/NPB structure with Re2O7 as an interfacial layer for OLED application

Krukowski Paweł, Piskorski Michał, Rogala Maciej, Dąbrowski Paweł, Lutsyk Iaroslav, Kozłowski Witold, Kowalczyk Dorota Anna, Krempiński Patryk, Ster Maxime Le, Nadolska Aleksandra, Toczek Klaudia, Przybysz Przemysław, Dunal Rafał, Ryś Wojciech, Sarkar Shankhanil, Łuszczyńska Beata, Kowalczyk Paweł J.

Opto-Electronics Review

2024

Vol. 32, No. 1

art. no. e148441

A graphene/NPB structure with Re₂O₇ as an interfacial layer in the context of its potential use in the design of an organic light-emitting diode (OLED) is investigated. The X-ray photoelectron spectroscopy (XPS) study shows the formation of the Re₂O₇ phase on a monolayer graphene on quartz during thermal deposition in ultra-high vacuum (UHV). The ultraviolet photoelectron spectroscopy (UPS) study shows an enhancement of the work function of the graphene heterostructure after deposition of the Re₂O₇ layer up to 5.4 eV. The hole injection barrier between the Re₂O₇/graphene heterostructure and the N-bis-(1- naphthyl)-N,N-diphenyl-(1,1-biphenyl)-4,4-diamine (NPB) layer was estimated to be 0.35 eV, which is very promising for a good OLED performance.