Tungsten oxide (WO3) is a material with optoelectronic properties, which can generate electron-hole pairs through photoexcitation. This process involves electrons in the material jumping from the valence band to the conduction band, forming free electrons and holes. When light hits the surface of tungsten oxide, the energy of the photons is absorbed, creating excited electron-hole pairs. This process can be explained by the transition of photogenerated electrons and the energy level structure within the bandgap.
In tungsten oxide, the energy range of the band gap is about 2.5-3.0 electron volts (eV), which makes it have good absorption ability for visible light and some ultraviolet light. When the photon energy is higher than the bandgap energy, the photon can excite electrons in the valence band to transition to the conduction band to form free electrons. In this process, a hole is left on the previously occupied energy level. These free electrons and holes can participate in optoelectronic processes, such as photoconduction, photoemission, and photocatalytic reactions. For example, in photoconduction, excited states of electrons and holes can move through the material and cause the flow of electrical current. In the photocatalytic reaction, the photogenerated electron and hole pairs participate in the surface reaction and promote the chemical reaction. The specific photogenerated electron-hole pair generation efficiency and behavior depend on the morphology, crystal structure, doping and light irradiation conditions of tungsten oxide and other factors. These factors affect the absorption of photons, the lifetime and migration characteristics of carriers, thereby affecting the performance of optoelectronics.
In summary, tungsten oxide can be excited to generate electron-hole pairs by light irradiation, which is determined by the transition of photogenerated electrons and the structure of the bandgap energy level. Such photogenerated electron-hole pairs play an important role in optoelectronic processes, such as photoconductivity and photocatalysis.
More details of tungsten oxide product, please visit website: tungsten-oxide.com
Please contact CHINATUNGSTEN for inquiry and order of tungsten oxide:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
