Spectroscopic analysis and device application of molecular organic dye layer in the Al/p-Si MIS contacts

Abstract

In this paper, the effect of 1-phenylazo-2-naphthol (1PA2N) dye molecules used as an organic interfacial layer on the electronic features of Al/p-Si contact was investigated. An Al/1PA2N/p-Si junction was fabricated using the spin coating method. The 1PA2N dye molecule was investigated using nuclear magnetic resonance, Fourier transform infrared, ultraviolet–visible (UV–vis) spectroscopy, and atomic force microscopy (AFM) analyses. The 1PA2N dye in methanol had optical direct band energy values of 2.33 eV (Q band) and 3.70 eV (B band) according to UV–vis absorption measurements. Surface analysis using AFM indicated that the 1PA2N film on the substrate was covered in nanoparticles. Also, several junction parameters of the Al/1PA2N/p-Si structure were determined utilizing current–voltage measurements based on the thermionic emission mechanism. Moreover, the interfacial state density for the Al/1PA2N/p-Si structure ranged within 1.516 × 1013 to 1.880 × 1012 eV−1 cm−2 in darkness and 1.699 × 1013 to 1.823 × 1012 eV−1 cm−2 under light.