What is the band gap of ZnO?

The estimated optical band gap of ZnO is found to be 3.63 eV which also clearly indicates the presence of blueshift at a growth temperature of 60 °C.

Is ZnO direct band gap?

Zinc oxide, an important semiconductor with a direct wide band gap and large exciton binding energy, has been used for solar cells, transparent electrodes, and blue/ultraviolet light emitting devices.

Does Zn have a band gap?

Zinc oxide is one of the most important metal oxides due to its unique physical characteristics of wide and direct band gap (~3.37 eV) with a large exciton binding energy (60 meV).

What are the optical properties of ZnO?

We found that the optical coefficient value of ZnO films is up to 5 x 104 cm-1. The optical band gap of ZnO films are about 3.69 – 3.82 eV. The optical bandgap of ZnO films decreases with increasing in annealing temperature. We also obtained that annealing temperature affects the surface morphology of the ZnO films.

What is the formula for band gap calculation?

band gap energy formula Eg = 1240/λ ( wavelength)….

What is the band gap of CdSe?

At room temperature the band gap of CdSe is 1.74 eV.

What is the band gap of silicon?

1.12 eV
Si (Silicon) has a band gap of 1.12 eV (electron volt). A semiconductor with a large value is called a wide-band-gap semiconductor.

How is band gap of silicon calculated?

Band Gap = = 1.127907 eV ; which is the band gap of P-type monocrystalline silicon wafer.

How do you dissolve ZnO nanoparticles?

If you want to dissolve, just add nitric acid. If you want to disperse the nanoparticles, then you have to do a surface modification. If the particles are ‘bare’ then perhaps increasing the pH helps to get some OH ions on the particle surface (ionic stabilization).

What is the optical band gap of ZnO thin films?

The optical band gap of Al-doped ZnO thin films ranging from 3.32 to 3.77 eV is higher than those of 3.25 to 3.28 eV obtained for pure ZnO thin films. 3.3. Photoluminescence Fig. 3 shows the PL spectra obtained at room temperature for pure ZnO thin films. PL results are found to be strongly dependent on the deposition temperature.

How to prepare nanostructured ZnO/ZnO TiO2 thin films?

In this work, the preparation of ZnO and ZnO: TiO2 thin films were conducted on glass prepared by sol-gel spray-spin coating technique. The performance and properties of nanostructured ZnO and ZnO: TiO2 thin films at different thickness were investigated.

Can composite oxide films enhance the performance of DSSCs?

Introduction Many researchers have been study the performance of the DSSCs by using other semiconducting metal oxide such as ZnO, TiO 2 , CuI, and SnO 2 and prepared composite oxide films to explore the possibilities of enhancing the efficiency of DSSCs [1].