Solar-Blind Ultraviolet Anisotropic Polarization Detection by β-Ga₂O₃ Based Schottky Photodiodes
Haoran Long, Tao Xiong, Jianwen Hu, Kexin He, Yue‐Yang Liu, Juehan Yang, Zhongming Wei
Abstract
β-Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> is expected to achieve polarization detection in the solar-blind ultraviolet due to its ultra-broad bandgap and anisotropic crystal structure. In this work, we theoretically analyze the physical mechanism of β-Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> to achieve polarization detection from the probabilities of electron transition. The β-Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> photodetector with a Schottky photodiode structure has a maximum responsivity of 1.1 A/W and a detectivity rate of 3.08×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The polarization detection performance of different crystalline planes was compared, and the polarization sensitivity of the (001) surface is stronger, with an anisotropic polarized photocurrent ratio (PR) of 5.8. This work is expected to contribute to the further development of β-Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> solar-blind ultraviolet polarization detectors.