Design of optoelectronic device based on double-layer spherical Cr(III)–Cr(VI) oxides/poly-O-chloroaniline as a trap for the incidence photons

The synthesis of the double-layer spherical Cr(III)–Cr(VI) oxides/poly-O-chloroaniline (Cr₂O₃–CrO₃/POCA) involves a one-pot technique, achieved through the direct oxidation of O-chloroaniline using K₂Cr₂O₇. The resulting Cr₂O₃–CrO₃/POCA nanocomposite exhibits impressive morphological and topographic characteristics, presenting spherical shapes with an average diameter of approximately 320 nm. These spherical particles are distinguished by a double-layer covering the spherical shape, contributing to their unique structure. The material’s exceptional crystallinity, coupled with its pronounced optical absorbance behavior and a small bandgap of 1.68 eV, positions it as a great candidate for light-sensing applications. The inherent trap for incident photons is explored through electrochemical studies. Under light conditions, the photocurrent density (J_ph) values show a notable enhancement from 0.012 to 0.046 mA·cm⁻² when transitioning from darkness to light. Moreover, specific responses are observed under monochromatic light at 340 and 730 nm, with J_ph of 0.022 and 0.013 mA·cm⁻², correspondingly. This broad and efficient response across a wide optical region underscores the favorable characteristics of this promising photoelectrode. The calculated R (responsivity) and D* (detectivity) stand at 0.22 mA·W⁻¹ and 0.4*10⁸ Jones, correspondingly, particularly at 340 nm. These metrics further affirm the excellent performance of the Cr₂O₃–CrO₃/POCA nanocomposite as a light-sensing device. The synthesis method employed for this light-sensing device is advantageous due to its technical simplicity, mechanical robustness, cost-effectiveness, and potential for mass production. This one-pot synthesis approach not only demonstrates the material’s efficacy in a laboratory setting but also opens avenues for direct industrial applications. The commercial viability of this light-sensing device is emphasized, showcasing its potential for integration into various industrial fields, thereby highlighting its practicality and promising contributions to the realm of light-sensing technology.