Heterostructure device based on Brilliant Green nanoparticles-PVA/ p-Si interface for analog-digital converting dual-functional sensor applications

摘要

Owing to the growing development of electronics manufacturing in tandem with the need for integration of electronic devices in the smallest size available, the need for multifunctional detectors becomes an insisted demand. Hence, the present research reports the enhancement of the optical and photoelectrical properties of polyvinyl alcohol, PVA, in ultraviolet and visible light regions by incorporating brilliant green dye, BG, nanoparticles of particle size 67.5 nm in PVA matrix. The molecular and crystal structure studies of PVA-BG spin-coated films are performed for verification of the influence of the embedded BG-dye molecules in the PVA matrix. The surface morphology and roughness of PVA-BG films are inspected and revealed a smooth nature of the film with average roughness ～4.157 nm. Significant enhancement of PVA optical properties is detected after adding BG nanoparticles using UV-Vis-NIR spectrophotometry, where a strong absorption in the visible region has resulted. Four exciting transitions are estimated with energies ～ 1.69, 2.31, 2.96, 3.29 and 4.64 eV. These enhanced properties are exploited in fabricating MIS structure based on Ag/PVA-BG/p-Si/Al as a dual-functional detector for sensing temperature and light intensity. The sensitivity of fabricated architecture as a temperature sensor is examined in the temperature range (293-373 K) and achieved an optimized sensitivity ～6.67 mV/K with a coefficient of determina-tion～99.30801 at driving current ～ 100 μA. The performance of the fabricated device as a light sensor is examined under the influence of halogen lamb light in light intensity range (20-80) mW/cm~2. The performance evaluation of the fabricated device as a photodetector is examined in terms of spectral responsivity, specific detectivity, linear dynamic range, signal-to-noise ratio, and ON/OFF switching behavior. The resulted values of these figures of merit parameters confirm the validity of Ag/PVA-BG/p-Si/Al to be utilized as a dual-functional sensor for light and temperature in many microelectronic circuits with stable, reliable and linear performance.