Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 169, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2022.110890
Keywords
Coomassie brilliant blue; Optical dispersion; Organic-inorganic heterojunction; I-V Characterization; Photodetector
Funding
- Scientific Research Deanship at the University of Ha?il-Saudi Arabia [RG-21 094]
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This study systematically investigated the structural, morphological, and optical properties of solution-processed coomassie brilliant blue (CBB) thin films for photodetection applications, revealing promising performance and stability. The fabricated heterojunction showed good figures of merit and stable response behavior, making it a potential candidate for photodetection applications.
Here, we introduce systematic investigations of structural, morphological, and optical properties of solution-processed coomassie brilliant blue, CBB, thin films for photodetection applications. First, the structural and morphological features of the spin-coated CBB thin films are investigated using XRD and FESEM microscopy and yielded a polycrystalline, nanostructured, and porous CBB film of crystallite size and RMS roughness similar to 31.95 nm and 10.65 nm, respectively. The UV-Vis-NIR spectrophotometric measurements of transmittance and reflectance elucidated the efficient absorption and light-harvesting of the UV and visible light range with estimated indirect energy gap and Urbach energy similar to 1.54 eV and 22.3 meV, respectively. Next, the dispersion behavior of the fabricated thin films is analyzed in the light of the single-oscillator model estimating the detail dispersion parameters. Furthermore, the dielectric function, as well as the nonlinear optical parameters, is accurately estimated. Subsequently, the microelectronic parameters of the engineered rectifying Ag/CBB/p-Si/Al heterojunction such as ideality factor, barrier height, series, and shunt resistances are estimated at different temperatures. The charges dynamical mechanism and the interface states density profile are analyzed, and the thermionic emission model is confirmed to fit the low bias region with a modified Richardson constant of about 34.8A/cm(2) K-2.After that, the photoresponse of the implemented organic/inorganic heterojunction is checked at different illumination intensities and showed a significant stable sensitivity with fast On-Off switching behavior. The fabricated heterojunction achieved good figures of merit such as responsivity, specific detectivity, linear dynamic range, and rise/fall time of about 4.289 mA/W, 2.07 x 10(9) Jones, 30.36 dB, and 61.6/82.5 ms, respectively. The good and stable responsive performance of the current Ag/CBB/p-Si/Al architecture may make it a potential candidate for photodetection applications.
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