Ti₃C₂Tₓ/Si Nanoholes Array (SiNHA) Schottky Photodiode for Filter-Free Color Single-Pixel Imaging (SPI)

In this letter, we report a self-powered Ti<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>C<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>T<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub>/Si nanoholes array (SiNHA) Schottky photodiode fabricated by spin-coating Ti<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>C<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>T<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> layer. The device exhibited enhanced photoresponse over the broadband wavelength range (265-1200 nm) and an excellent linear dynamic range (LDR, 119 dB), showing responsivity, specific detectivity and response speed of 0.97 A W<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^{-{1}}$ </tex-math></inline-formula>, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.03\times 10^{{14}}$ </tex-math></inline-formula> Jones and 162/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$60~\mu $ </tex-math></inline-formula>s for rise/fall time at zero bias upon 970 nm illumination (light intensity: <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2.5~\mu $ </tex-math></inline-formula>W cm<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^{-{2}}$ </tex-math></inline-formula>), respectively. The broadband photoresponse ensured the high-quality visible Fourier single-pixel imaging (FSI) and a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$256\times 256$ </tex-math></inline-formula>-pixel color image was achieved by synthesizing R-, G-, and B-channel monochrome images obtained at 7.79% sampling rate. This work also provides a simple strategy for filter-free color single-pixel imaging (SPI).