Photosensitive properties of Schottky type photodiodes prepared by spin coating of isoniazid Schiff base thin film on p-Si

• Published in: Optical and quantum electronics Vol. 56; no. 6
• Main Authors: Tezcan, Ali Osman, Oruç, Pınar, Tuğluoğlu, Nihat, Eymur, Serkan
• Format: Journal Article
• Language: English
• Published: New York Springer US 09.05.2024
• Subjects: Characterization and Evaluation of Materials; Computer Communication Networks; Electrical Engineering; Lasers; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Illumination intensity; Series resistance; Photodiode; Isoniazid; Current voltage; Schottky diode
• ISSN: 1572-817X; 1572-817X
• DOI: 10.1007/s11082-024-06770-4

In this study, a layer of isonicotinohydrazide and pyrene-based Schiff base (PyMIs) was formed on the front side of a p-Si semiconductor using the spin coating method, and an Al/PyMIs/p-Si/Al diode was fabricated. The I - V characteristics of the fabricated diode were measured under dark and from 20 to 100 mW/cm 2 illumination intensities for both forward and reverse bias. Diode parameters, including saturation current ( ), ideality factor ( n ), and barrier height ( ) were investigated for all measurements based on thermionic emission theory. The values n changed from 2.51 to 2.05, and the changed from 0.77 eV to 0.86 eV as light intensity increased from dark to 100 mW/cm 2 . The series resistance ( ) values of the diode were investigated using the modified Norde’s function and Cheung’s functions. An analysis of the forward plot of Al/PyMIs/p-Si (MOmS)-type diode specified the carrier transport domination by ohmic conduction in the lower bias regions, by the space-charge-limited current (SCLC) at medium bias regions and the trap-charge limit current (TCLC) transport mechanism at higher bias regions. The fabricated diode exhibited typical photodiode behavior with reverse current values increasing from 9.13 × 10 − 6 A to 1.05 × 10 − 4 A, respectively. Furthermore, characteristics illuminated from 20 to 100 mW/cm 2 were also studied, and they indicated that the Al/PyMIs/p-Si diode could operate in a photovoltaic regime.