Probing surface states in C₆₀decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations

Abstract

ZnO/C60composites were studied by spectroscopic techniques, suggesting the possibility of controlling/tuning the emission outcome by changing the C60amount on the ZnO surface.

Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

“…This behavior was attributed to both ZnO surface defect passivation and charge transfer between the two materials. Indeed, the interaction between carbon-based materials and ZnO is widely affected by the properties of each component, which may differ considerably depending on the type of structures and synthesis methods, resulting in subsequent variation in the alignment of the energy levels of both materials, namely the defect-related ones, leading to different luminescence features 33 , 75 .…”

Electrochemical and Photoluminescence Response of Laser-induced Graphene/Electrodeposited ZnO Composites

“…Similarly, combining ZnO and LIG produced simultaneously by direct laser scribing showed that when the ZnO structures were produced from metallic zinc, the PL spectra displayed a weak luminescence signal, comprised by an orange/red emission band and with a very small contribution from the NBE emission, comparable to the spectral features observed herein 32 . Indeed, the interaction between carbon-based materials and ZnO is widely affected by the properties of each component, which may differ considerably depending on the type of structures and synthesis methods, resulting in subsequent variation in the alignment of the energy levels of both materials, namely the defect-related ones, leading to different luminescence features 32,73 .…”

ZnAl2O4 decorated Al-doped ZnO tetrapodal 3D networks: microstructure, Raman and detailed temperature dependent photoluminescence analysis

“…3,[14][15][16][17][18][19] Doping effects, thermal treatments under different atmospheres and coverage of as-grown micro-and nano-ZnO surfaces with continuous dielectric media are known to result in strong modications in the electronic energy levels inside the bandgap and band structure of the semiconductor oxide, with a notable inuence on the optical and electrical material response. 15,[20][21][22][23] In the case of ZnO, which has one of the largest free exciton binding energy values ($60 meV 23,24 ), a bandgap energy of $3.4 eV (at low temperature 23,25 ) and an exciton Bohr radius of $1.8 nm, 23,26,27 surface-related inuence has been reported in several optical studies, from cleaved bulk samples 28 to low dimensional structures. 20,[29][30][31][32][33] Additionally, decorating ZnO micro-and nanostructures with other metal oxides is known to result in numerous heterojunctions with enhanced properties, as in the case of gas sensor applications.…”