Unveiling of novel synthesized coumarin derivative for efficient self-driven hybrid organic/inorganic photodetector applications

Document Type

Article

Publication Date

Spring 3-10-2024

Abstract

During this study, a novel organic semiconductor material comprising coumarin and chromone moieties was synthesized via a facile route. Thin films of the synthesized powder were thermally deposited under vacuum conditions. The structural and morphological properties were investigated using X-ray diffraction and scanning electron microscope techniques, respectively. With increasing the film thickness, a relative crystallinity enhancement was observed, besides improving the surface features and uniformity. Furthermore, the UV–vis–NIR spectral transmittance and reflectance of the grown films were measured. The variation of film thickness induced significant changes in the optical parameters either dispersive or electronic such as energy gap (3.67–3.8 eV), oscillator energy (4.25–4.56 eV), and dispersion energy (4.61–10.31 eV). In addition, the nonlinear optical parameters and PL emission spectra of the prepared films were measured and analyzed in detail. Then, these films were exploited integrally with p-Si for the fabrication hybrid junction for light sensing. The optimized film thickness based on the optical, structure results, and electronic performance under dark conditions was ∼124 nm. Such a device showed a pronounced self-driven photodetection performance under different illumination intensities. The photoelectronic parameters including responsivity (∼5.17 mA/W), detectivity (∼2.64 × 1010 Jones), linearity (∼72.72 dB), and rise/fall times(∼51.48 ms/47.75 ms) were extracted and compared to other organic/p-Si devices and showed a high superiority.

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