Document Type

Article

Publication Date

Summer 6-5-2025

Abstract

Here, the effect of cobalt phthalocyanine (CoPC) functionalization by a monocarboxylic group in the form of thermally evaporated thin films followed by plasma treatment for variable time intervals is introduced. The effect of plasma treatment on crystalline structure, molecular structure, and morphology was examined using the XRD, FT-IR, and FE-EEM techniques. Significant modifications were observed in the crystal structure and morphology with increasing plasma treatment time intervals. The plasma treatment for 5 min enhanced the formation of the nanorods along the deposited surface with improved crystallinity. Tracking the optical properties variation of the deposited MCCoPc thin films under plasma treatment was performed spectrophotometrically. Remarkable variations were noticed in the absorption features, with a notable decrement in the values of the energy band gap to 1.43 eV. The electrical properties of organic/inorganic (MCCoPc/p-Si) heterojunctions were studied and analyzed as to how plasma exposure affects the electrical conduction properties of the fabricated devices. Finally, the study of current-voltage relations under dark conditions and illumination confirmed the suitability of this architecture for photodetection applications. Furthermore, the performance of the designed photosensors was evaluated in terms of responsivity, specific detectivity, linearity, and signal-to-noise ratio values. The 5 min plasma-treated device achieved pronounced photodetection performance with good noise immunity and fast, stable switchable response.

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