Long-Wave Infrared Photodetectors Based on 2D Platinum Diselenide atop Optical Cavity Substrates

Long-wave infrared (LWIR) photodetection is of high technological importance, having a wide range applications that include thermal imaging and spectroscopy. Two-dimensional (2D) noble-transition-metal dichalcogenides, platinum diselenide (PtSe2) in particular, have recently shown great promise for detection. However, previous studies mainly focused on wavelengths up to the short-wave region. In this work, we demonstrate LWIR photodetectors based multilayer PtSe2. addition, present an optical cavity substrate enhances light–matter interaction 2D materials thus their performance spectral The PtSe2 photoconductors fabricated TiO2/Au exhibit responsivities 54 mA/W illumination at wavelength 8.35 μm. Moreover, these devices show fast photoresponse with time constant ns white light illumination. findings study reveal potential broadband from visible wavelengths.