The effect of heat treatment on the optical properties of organic semiconductor (NiPc/C60) thin films

Atheer M Mkhaiber

doi:10.30723/ijp.v16i39.100

Abstract

Thin films of the blended solution of (NiPc/C60) on glass substrates were prepared by spin-coated method for three different ratios (100/1, 100/10 and 100/100). The effects of annealing temperature and C60 concentration on the optical properties of the samples were studied using the UV-Vis absorption spectroscopy and FTIR spectra. The optical absorption spectrum consists of two main bands, Q and B band, with maxima at about (602-632) nm and (700-730) nm for Q1 and Q2 respectively, and (340-375) nm for B band. The optical energy gap were determined from optical absorption spectra, The variation of optical energy gap with annealing temperature was nonsystematic and this may be due to the improvement in crystal structure for thin films. While the energy gap decreased by increasing the concentration of C60 approaches from the energy gap of this compound.

Highlights

Introduction “Organic semiconductors” be present organic materials showing the typical behavior of semiconductors, i.e. that is insulators whose conductivity can be increased by heating, doping, illumination or further processes are increasing the charge carrier density [1]
The bulk heterojunction blend (NiPc/C60) thin films were annealed in a vacuum oven at different temperatures (373, 423 and 473) K for one hour to study the influence of heat treatment temperatures on optical properties
The absorption spectra of (NiPc/C60) thin films at room temperature, 373, 423 and 473 K with three different ratios are shown in the Fig.2, it shows the variations of absorption spectra of (NiPc/C60) films as a function of wave length in the range of 300–800 nm for three different ratios

Summary

Introduction

Introduction “Organic semiconductors” be present organic materials showing the typical behavior of semiconductors, i.e. that is insulators whose conductivity can be increased by heating, doping, illumination or further processes are increasing the charge carrier density [1]. Key words Organic semiconductors, NiPc: C60, optical properties and heat treatment.

Results

Conclusion