Organic Photomultiplication Detectors with Wavelength-Selectivity for Spectral Reconstruction

Abstract

Compared to silicon-based red-green-blue (RGB) detectors, which are challenged by complex architectures and low efficiency, organic photodetectors (OPDs) excel with advantages including spectral flexibility and photomultiplication. In this study, organic detectors coupling a hole-injection-type organic photomultiplication layer with a Fabry-Pérot microcavity are designed and fabricated to achieve RGB-selective responses with high quantum efficiency. By leveraging the optical resonance effects induced by the Fabry-Pérot microcavity, the response of the OPD is precisely tailored to three narrowband blue, green, and red peaks with full-width-at-half-maximum (fwhm) values of 86, 81, and 60 nm, respectively. Notably, the detectors exhibit pronounced photomultiplication across all RGB bands, achieving peak EQE values of 35262% (blue), 24785% (green), and 32511% (red) at a bias of −20 V. These quantum efficiency metrics surpass those of conventional nonmultiplication detectors by several orders of magnitude, representing state-of-the-art performance among reported RGB-selective photodetectors. A peak specific detectivity (D*) of 3.4 × 1011 Jones is achieved at 540 nm with a bias of −5 V. Specifically, the results indicate that the RGB detectors hold significant potential for applications in both spectral reconstruction and color imaging.