Investigation of Nickel Phthalocyanine Thin Films for Solar Cell Applications

Abstract

Ni-Phthalocyanine thin films were thermally evaporated with different substrate temperatures (300 -450) K on (silicon wafer, glass) substrates. The chemical bonds of NiPc powder were investigated by FTIR spectrum, which introduce good information for NiPc bonds and their locations. The optical properties have been studied by UV-Visible, and Photoluminescence (PL) Spectra. The NiPc thin films have direct gap for all samples. The values of energy gap which is calculated by PL spectra are lower than those calculated by Tauc equation. It is found there are three activation energies, the mobility and concentration of carriers have been measured and, the NiPc films are p-type. P-NiPc/n-Si HJ solar cell was fabricated at substrates temperatures (300, 400) K. From I-V and C-V characteristic, abrupt junction has been found, photovoltaic characteristics have been observed with Voc of (0.335 -0.415) V, and Isc of (2.77 -4.26) μA, and the efficiency of (3.08 -5.03)% at room temperature and substrate temperature (300, 400 K) and under illumination of 55 mW/cm 2 using Halogen lamp. Ideality factors of the junction increase from (0.61 -0.73) and barrier height increases from 2.53 eV to 3.69 eV while shunt resistance decreases from 3.76 KΩ to 2.59 KΩ and series resistance decreases slightly from 0.24 KΩ to 0.23 KΩ. The fill factor decreases from 0.46 to 0.4 with the increase of substrate temperature.

Analysis of the optical and electronic characteristics of Al/NiPc complex/p-Si diode

“…Especially, for B band, the α value greater than 10 4 cm −1 means the possibility for direct transition [52]. This result shows that the NiTsPc has a direct band gap [47,52,56]. In this case, Tauc law [47] is valid.…”

“…Besides, the α values are higher than the value of 10 4 cm −1 . Especially, for B band, the α value greater than 10 4 cm −1 means the possibility for direct transition [52]. This result shows that the NiTsPc has a direct band gap [47,52,56].…”

“…If the α value is α<10 4 cm −1 , electronic transition is an indirect [48][49][50][51]. The magnitude of α was obtained by the equation given below [52][53][54][55]:…”

Effect of Violet Laser Irradiation on the Optical Properties of Polyvinyl Alcohol/Methyl Orange Composite Thick Films: A Model for Medical Applications

“…The extinction coefficient k is related to the absorption coefficient and the light's wavelength by [24]:…”