Optically transparent ZnO-based n–i–p ultraviolet photodetectors

High photocurrent gain in NiO thin film/M-doped ZnO nanorods (M=Ag, Cd and Ni) heterojunction based ultraviolet photodiodes

“…Under UV illumination the absorbed photons in the vicinity of the heterojunctions give rise to the generation of electron-hole pairs. The enhancement in the carrier densities results in the redistribution of space charge in the depletion region of the heterojunctions, leading to shrink the barrier width [36,37]. In this case, more charge carriers are allowed to tunnel across the narrowed depletion region of the heterojunctions, increasing the current exponentially as can be seen in Figure 6.…”

“…In this case, more charge carriers are allowed to tunnel across the narrowed depletion region of the heterojunctions, increasing the current exponentially as can be seen in Figure 6. is enhanced [32,37]. The double effect of the recombination-tunneling and SCLC transport mechanisms results in high photocurrent gain for the fabricated p-n heterojunction ultraviolet photodiodes.…”

Performance enhancement of ZnO‐based MSM photodiodes by optimizing structure parameters

“…Compared with other wide‐band gap semiconductors, ZnO is recognized as a competitive candidate for UV photodetectors because of its higher resistant to high‐energy particle irradiation, higher exciton binding energy, higher carriers saturation velocity, and simpler and lower cost fabrication process . ZnO‐based photodetectors with different device structures have been reported in the literature . However, because producing p‐ type ZnO material is not yet an easy process and so far it has been unreliable, the metal‐semiconductor‐metal photodiode (MSM‐PD) has emerged persuasively as an attractive alternative device structure …”

Effect of Na concentrations on microstructure and optical properties of ZnO films

“…It has a large exciton binding energy of 60 meV which makes the exciton hard to be thermally ionized. Therefore, ZnO is a very promising material for optoelectronic devices, such as ultraviolet light-emitting diodes [1][2][3] , laser diodes [4] , photodetectors [5,6] , surface acoustic wave devices [7,8] .…”