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Nowadays, energy resources (oil, coal and natural gas) are limited, studies on turning to alternative or sustainable energies have increased in recent years. Among the sustainable energy sources, solar energy attracts the most attention. Researchers in many industries are engineering all kinds of better-performing materials, abourt solar cells The most important point in using solar energy is the efficient conversion of sunlight into electrical energy. I this study Sr doped BaTiO3 candidate has strong photorefractive sensitivity and large electrooptic coefficients, making it a suitable crystal for use as a semiconductor in photovoltaic systems. In this study, optical properties of BaTiO3 were calculated with Denstiy Functional Theory (DFT). [ABSTRACT FROM AUTHOR]

In this study, we investigated the effect of different reducing agents (ascorbic acid and sodium boron hydride) on optoelectronic properties of TiO2:Cu2O nanocomposites. The TiO2:Cu2O nanocomposites were characterized using X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), and Energy dispersive X-ray (EDX). The electronic properties of the structure were calculated with the density functional theory (DFT). Both devices showed good responsivity and detectivity against light intensities. The photosensitivity of the devices had linear increasing profile with increasing light power. It is noteworthy that both devices demonstrated well-rectifying behaviors as a result of having low reverse bias and greater forward bias currents at the I–V characteristics in low light. The reduction of the band gap shifted the absorption band gap from the visible light region to the red edge. Density Functional Theory (DFT) calculations which has been done by using CASTEP are in good agreement with our experimental results. Ti(1 − x)CuxO2 (7.5:1) band gap is 1.18 eV which is compared to the Shockley ve Quiser (SQ) limit. Ti(1 − x)CuxO2 (15:1) band gap is 1.83 eV while the band gap is 2.28 eV for stoichiometric TiO2 with our DFT calculations. Thus, the band gap narrowed with increasing Cu amount. This provides an improvement in light absorption. In conclusion, the results demonstrate that Al/TiO2:Cu2O/p-Si can be used in optoelectronic applications. [ABSTRACT FROM AUTHOR]

Research into alternative energy sources has gained popularity in recent years due to the increasing demand for energy as the world's population grows and fossil fuels become scarcer. For this reason, energy has become one of the most important areas of scientific research in recent times. Although studies have been carried out on this subject in our country, more comprehensive research is needed to bring it to an adequate level. This study, which was carried out to increase the use of renewable energy, is aimed to contribute to the protection of the world and the environment.The aim of this study is to obtain doped TiO2 dye-sensitised solar cells to obtain high-efficiency, lowcost solar cells that generate electrical energy using solar energy, which is an important resource . Bismuth and Zirconium were doped at 1% and 3% in the study. Characterisations were carried out by XRD, SEM, EDS. Band gap and efficiency measurements of photo anodes were performed. The band gap increased with the addition of Bi and Zr. [ABSTRACT FROM AUTHOR]

In recent years, electricity generation from renewable sources has gained popularity. In particular, electricity generation based on solar energy is expected to be the most suitable solution to meet the energy needs of urban environments in the near future. While providing renewable-based energy to urban areas poses a major challenge, rooftop Photovoltaic (PV) systems that harness solar energy could pave the way to a more sustainable environment for cities. From an environmental perspective, every MWh of electricity generated from renewable sources reduces the introduction of large amounts of greenhouse gases into the atmosphere, thereby promoting a healthy environment and reducing global warming. Small-scale building-connected solar energy systems contribute significantly to the rapid growth of electricity generation potential from solar energy globally. This study aims to investigate the future of PV systems placed on roofs in the central housing sector of Kütahya, focusing especially on building roof areas. In this context, average solar radiation maps are provided to estimate the electricity generation potential of rooftop PV systems and evaluate the production potential. In addition, Geographic Information System (GIS) was used to evaluate the total roof area and solar potential of residential buildings in Kütahya province through spatial analysis. Finally, performance simulations were conducted, allowing solar potential prediction from annual solar irradiance, considering local building construction and PV design requirements. As a result of the analysis, it was determined that a total of 1979.7 MWh of electricity could be produced annually from a total roof area of 35121 m2 from a group of faculty buildings in the university campus located in the Kirazpınar neighborhood of Kütahya center, and a recommendation was made to form a basis for future studies on the energy efficiency of different PV solar cells. [ABSTRACT FROM AUTHOR]