The role of NiO in isotype heterojunction photodiodes

Abstract This study presents a structural analysis of NiO and the fabrication of Al/NiO/p-Si isotype heterojunction photodiode (PD) as well as an investigation of the photo-response and photovoltaic (PV) properties of the PD in the various illumination intensities. The series resistance ( R S ) value of the Al/NiO/p-Si was calculated to be 0.11 kΩ using Ohm’s Law at 2 V. This result corroborates the assertion that R S is the pivotal parameter for attaining optimal performance in a PD. The NiO has made a notable improvement to the electrical parameters such as ideality factor, barrier height, and series resistance. The spectral responsivity R value of the PD was calculated as 1.59 A W −1 at −2 V. The Al/NiO/p-Si exhibited a short-circuit current density ( J SC ) of 60.38 mA·cm −2 , an open-circuit voltage ( V OC ) of 149.0 mV, a fill factor ( FF ) of 27.67%, and a power conversion efficiency ( PCE ) of 2.49%. In view of the experimental results, it can be concluded that NiO represents a promising material for the optimization of heterojunction photodiode applications.