ε-Ga2O3 solar-blind photodetector: Pyroelectric effect and flame sensing application

The e-Ga2O3 pyroelectric material is ideal for DUV photodetectors, especially for high-temperature applications like atmospheric monitoring and flame detection. This study discusses the performance of Ni/e-Ga2O3 Schottky photodetectors and their response to high temperatures. At room temperature, the dark current is as low as-1.59 x 10-10 A at-10 V bias voltage, the photo-to-dark current ratio ( PDCR ) is more than 5.0 x 103, the responsivity (R) is 27.68 A/W, the external quantum efficiency (EQE) is 13511 %, and the detectivity (D*) is more than 1.56 x 1013 Jones. High temperatures increase dark current and decrease photocurrent due to phonon scattering and thermal excitation, reducing detection efficiency. However, below 125 degrees C, the detector shows fast response times and strong self-powered capabilities, maintaining good performance up to 150 degrees C. The coupling of pyroelectric and photovoltaic effects enhances photoresponse, offering millisecond-level response times and high resolution, making it a promising candidate for energy-efficient flame detectors.