Efforts to combat climate change are largely focused on industrialised countries. However, low- and lower-middle income countries (LLMICs) have rapid population growth and a large potential for economic and industrial...
Perovskite solar cells are one of the most promising solar cell technologies, showing rapid development in power conversion efficiency (PCE). In this work, the performance and stability of triple-cation perovskite solar cells under continuous outdoor illumination in Bahir Dar 2 climatic conditions and also the luminescence properties using steadystate photoluminescence (PL) spectroscopy has been studied. The work is conducted to study the electrical characterisation of the device under investigation in outdoor testing under ambient conditions to study the open-circuit voltage, short-circuit current density, fill factor, and efficiency of the device and obtained a PCE of above 16%, and a fill factor of above 60% with strong PL peak emission at 757 nm.
In this paper, we have analyzed the optical properties of single and double layer antireflection coatings with the help of influential characteristics matrix formulation method in the visible electromagnetic spectrum. We have studied deeply for the glass coated with MgF_2 as a single layer coating and the spectrum analysis of double layer coatings of glass with〖 MgF〗_2-Al_2 O_3. With the aid of the algebraic mathematics and MatLab program, we have developed antireflection coating designs which leads to an enhancement of material’s ability for transmission spectrum through it. According to the result we have obtained, it clearly seen that the maximum transmission power for single layer and double layer coatings are about 97.2% which occurs at wavelength of 450 nm and 100% occurs at 324 nm, respectively. It is also observed that the minimum value recorded in transmission spectra for double layer antireflection coating is 99.83% at a wavelength of 418 nm (for normal incidence) and 400 nm (for θ=60° angle of incident). In broadly speaking, our fundamental work shows double layer antireflection coating is more convenient and feasible than single layer antireflection coating.
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