Cavity-Enhanced Near-Infrared Organic Photodetectors Based on a Conjugated Polymer Containing [1,2,5]Selenadiazolo[3,4-c]Pyridine

Abstract

Miniaturization of spectrometers can be achieved using an array of narrowband photodetectors responsive at specific wavelengths. In this work, sensitive organic narrowband photodetectors with tunable spectral response in the near-infrared (NIR) wavelength range are demonstrated. This is achieved using a resonant optical-cavity device architecture based on a thick ZnO spacer to increase the weak NIR absorption of a low-band gap conjugated polymer containing [1,2,5]selenadiazolo [3,4-c]pyridine. We realize spectral response full-width at half-maximum (FWHM) values down to 22 nm and achieve calculated peak specific detectivity (D*) over 10 11 Jones in these cavity-enhanced photodetectors. More importantly, we achieve continuously tuned detection wavelengths over a wide wavelength range of 660−1510 nm. This allows for a proof-of-concept demonstration of a miniaturized spectrometer for the NIR wavelength range and can resolve the NIR characteristic absorption bands of water, ethanol, and acetone.

Ultraviolet Narrowband Photomultiplication Type Organic Photodetectors with Fabry−Pérot Resonator Architecture

“…Ultraviolet (UV) narrowband PM-OPDs can hardly be realized by solely employing CIN concept. Optical microcavity with a Fabry−Pérot (FP) resonator architecture is usually utilized to adjust light with specific wavelength, [19][20][21] which can be utilized to adjust spectral response range of PM-OPDs. The PM-OPDs coupled with optical microcavity (COM) should be a smart strategy to achieve UV highly narrowband response.…”

Doped Polyaniline/Graphene Composites for Photothermoelectric Detectors

“…24 Photodetectors take advantage of involving polymers as composite components, improving solution mixing, mechanical flexibility, long-term stability, and biocompatibility, leading to potential brand applications in PTE areas. 25 Previous investigation of poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine], 26 poly(vinyl alcohol) (PVA), 27 [1,2,5]selenadiazolo [3,4-c]pyridine, 28 and other polymers from nearinfrared to ultraviolet photodetectors implies the possibility of further detection in the long-wavelength infrared to terahertz range. Our previous work introduced poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as the transparent detector composite.…”

Synthesis and characterization of a copper(II) phthalocyanine‐based dye for organic photodetectors

“…As light‐absorbing materials, numerous types of materials have been developed and the most successful materials are conjugated polymers 10–13 . Recently, Tang et al synthesized a selenadiazolopyridine‐based low bandgap polymer, and this polymer‐based OPDs showed full‐width at half‐maximum values of 22 nm with specific detectivity ( D* ) over 10 11 Jones 14 . Gasparin et al reported ultralow bandgap TQ‐T polymer composed of thiadiazoloquinoxaline (TQ) and thiophene (T) moiety.…”

“…[10][11][12][13] Recently, Tang et al synthesized a selenadiazolopyridine-based low bandgap polymer, and this polymer-based OPDs showed full-width at half-maximum values of 22 nm with specific detectivity (D*) over 10 11 Jones. 14 Gasparin et al reported ultralow bandgap TQ-T polymer composed of thiadiazoloquinoxaline (TQ) and thiophene (T) moiety. It showed short wave infrared absorption with responsivity (R) of 0.01 A/W at 1200 nm and D* of 10 7 -10 8 Jones across the NIR region (1000-1800 nm).…”