Zero-bias photo-induced charge separation using built-in electric field at p-NiO/n-Ga2O3 heterojunction interface
Abstract
As a viable alternative to the challenging fabrication of robust β-Ga2O3 p–n homojunctions, this study investigates the variable-temperature photocurrent of p-NiO/n-Ga2O3 heterojunction photodiodes under zero-bias conditions. The device's built-in electric field is utilized to achieve efficient separation of non-equilibrium photogenerated carriers. To support the experimental findings, computer simulations of the electric field distribution at the heterointerface were performed and correlated with experimental current–voltage and capacitance–voltage measurements. The photocurrent measurements confirm the narrowing of the n-Ga2O3 bandgap with increasing temperature, consistent with predictions from the Varshni equation. The observed decrease in photocurrent amplitude at lower temperatures is attributed to bandgap widening, which results in a smaller number of non-equilibrium carriers generated by the excitation wavelength.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (10)
Leonid Chernyak
Department of Physics, University of Central Florida 1 , Orlando, Florida 32816,
Gabriel Marciaga
Department of Physics, University of Central Florida 1 , Orlando, Florida 32816,
Jian-Sian Li
Department of Chemical Engineering, University of Florida 1 , Gainesville, Florida 32611,
Chao-Ching Chiang
Department of Chemical Engineering, University of Florida 1 , Gainesville, Florida 32611,
Hsiao-Hsuan Wan
Department of Chemical Engineering, University of Florida 1 , Gainesville, Florida 32611,
Fan Ren
Stephen J. Pearton
Department of Materials Science and Engineering, University of Florida 2 , Gainesville, Florida 32611,
You Seung Rim
Department of Semiconductor Systems Engineering and Convergence Engineering for Intelligent Drone, Sejong University 1 , Seoul 05006,
Arie Ruzin
School of Electrical Engineering, Tel Aviv University 6 , Tel Aviv 69978,
Alfons Schulte
Department of Physics, University of Central Florida 1 , Orlando, Florida 32816,