Fig. 1: Black phosphorus (BP) ink film for mid-wave infrared (MWIR) imager.
From: Mechanically flexible mid-wave infrared imagers using black phosphorus ink films
Schematic illustration of the cross-sectional structure of (a) a single-pixel photodetector and (b) the imager. ITO, indium tin oxide; Y6, a non-fullerene acceptor; PEDOT:PSS, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate). c Optical image of the backside of an imager array fabricated on a transparent, flexible film, with photodetector pixels incorporating BP films. The bottom Au electrodes are routed to external Au pads positioned around the perimeter of the array. The black film is the BP film, functioning as the photoactive material of the photodetectors, while other functional layers are not optically distinguishable. (Inset) Optical micrograph of single pixel. The light gray area represents the PI/Ti/Au/PEDOT:PSS/BP/Y6 layers, while the dark gray area includes an additional ITO film layer. The white dashed line outlines the pixel. d In-plane optical micrograph of the BP film deposited on a PI/Ti/Au/PEDOT:PSS stack. e Cross-sectional optical micrograph of a photodetector pixel deposited on a PI/Ti/Au/PEDOT:PSS substrate. f Thickness mapping of an 8 mm × 8 mm BP film deposited on a quartz/Ti/Au/PEDOT:PSS substrate.
