Study of Some Physical Characteristics of an organic dye prepared as thin film form and its photovoltaic applications

Abstract

Organic semiconductors are an attraction point for scientists. Organic semiconductor is a basic of new electronics due to its advantages. they are less expensive, lighter, and more flexible in shaping and manufacture when compared to an inorganic semiconductor. Organic semiconductors are used in a range of applications such as light emitting diodes (OLEDs), field effect transistors (OFET) and solar cells (OSC). In the first part, the thermal evaporation technique was used to deposit organic thin films of 4-dimethyl amino benzeldine malononitrile (DBM) and their structural, electrical and optical properties were investigated. In the second part, organic solar cell was fabricated. We examined the electrical and photovoltaic properties of these cell to obtain the solar cell parameters optimization and fabrication. Thermal properties of DBM compound were studied using Differential thermal analysis (DTA) methods. The compound is thermally stable up to its melting point at 435 K. The crystal structure of DBM was determined by X-ray single crystal diffraction using single crystal diffractometer. It was found that the DBM crystallized in the monoclinic system with P21 space group and the lattice parameters are given as a = 16.992 nm, b = 3.910 nm, c = 9.391 nm, α = 90.00◦, β = 123.72◦ and γ = 90.00◦. On the other hand, X-ray powder diffraction of DBM indicated that the material in the powder form is polycrystalline. Miller indices, hkl, values for each diffraction peak in the X-ray powder diffraction spectrum were calculated using a computer program.