The density functional calculation is performed for centrosymmetric (La–Pm) GaO₃ rare earth gallates, using a full potential linear augmented plane wave method with the LSDA and LSDA exchange correlation to treat highly correlated electrons due to the very localized 4f orbitals of rare earth elements, and explore the influence of U=0.478 Ry on the magnetic phase stability and the densities of states. LSDA calculation shows that the ferromagnetic (FM) state of RGaO₃ is energetically more favorable than the anti-ferromagnetic (AFM) one, except for LaGaO₃ where the NM state is the lowest in energy. The energy band gaps of RGaO₃ are found to be in the range of 3.8–4.0 eV, indicating the semiconductor character with a large gap.

Rural areas suffer from high costs of grid extensions obliging institutions to provide for other remedies for consumers, like using generators (GE) diesel often considered as economic and reliable solutions, but at the detriment of some order environment pollution and users convenience. Furthermore, the continuous decline in GEs prices based on a renewable energy (RE) and the increasing reliability of these systems have lead to a greater use of renewable energy sources for power generation in remote areas. A property which limits the use of renewable energy is related to the variability of resources. Fluctuations in load according to annual or daily periods are not necessarily correlated to the resources. In remote areas, the preferred option is the coupling between multiple sources, such as wind turbines and solar panels, this coupling is called hybrid power system. Algeria’s geographic location presents several advantages for the development and use of renewable energy, namely, solar energy and wind energy. In addition, Algeria has huge deposits of natural gas, 98% electricity comes from gas. Therefore, currently, the production of electricity from renewable energies primarily depends on their competitiveness with economic gas. Studied technological feasibility and economic viability of the hybrid system (PV/fuel) electrification project in a school located in Ferraguig succeed to reduce high costs, energy dependence, fuel supply problem, complicated/expensive maintenance, low lifetime, impossibility of 24 hours electricity production and waste oil management issues, by using renewable energy. HOMER model is used here to size a proposed system and determine an optimum configuration.

The development of high-performance thermoelectric (TE) materials is critical for advancing thermo-photovoltaic (TPV) technologies. To evaluate TE properties of AlGaSbAs-based systems, highlighting their potential for efficient thermal energy conversion in TPV cell applications, this paper explores and selects a new material that predict TE performance of TPV system while ensuring environmental sustainability. The study further delves into material-specific performance with a case study on AlGaSbAs, including thermal conductivity, bandgap (E_g) engineering and figure of merit using a Python simulation tool to improve the TPV cells’ quantum efficiency and thermal stability. Using such a predictive computational framework, key TE parameters are quantified: figure of merit (ZT ∼ 1.5–2.5), Seebeck coefficient (S: 150–300 μV/K), electrical conductivity (10³–10⁴ S m⁻¹), and thermal conductivity (κ _l of 0.91 W mK⁻¹ at 1100 K). Suitable E_g of Al_0.125Ga_0.875Sb_0.75As_0.25 (0.554 eV) ensures alignment with mid-infrared photon energies, optimizing energy conversion in TPV systems operating at 500–1200 K. Innovations include alloy engineering to enhance phonon scattering, nanostructuring to minimize lattice thermal conductivity (κ _l ), and doping strategies to boost power factor. This study establishes AlGaSbAs as a scalable, thermally stable, and environmentally friendly material for next-generation TPV systems, providing a pathway for integrated TE and photovoltaic energy conversion solutions. The results showed that the thermal conductivity decreases with increasing temperature following a trend where it is inversely proportional to temperature which is beneficial as it suggests reduced heat loss at higher temperatures. S coefficient showed a linear increasing trend with the increasing of temperature demonstrating that the material becomes more effective at converting temperature differences into electrical voltage at higher temperatures. With controlling thermal parameters and selecting of the most suitable material, the efficiency of AlGaSbAs-based TPV cells can be significantly improved, making them more viable for high-temperature applications.

Thermophotovoltaic conversion using heat to generate electricity in photovoltaic cells based on the detraction of thermal radiation suffers from many engineering challenges. The focus of this paper is to study the nanostructure of AlGaAsSb for thermophotovoltaic energy conversion using lattice-matched heterostructures of GaSb-based materials in order to overcome the current challenges. The XAFS spectroscopy technique was used to analyze electronic structures and optical properties of GaSb, (Al, In) GaSbAs. The XAFS spectroscopy analysis showed a powerful decay at peak intensity that reveals to be related to a loss in Sb amount and light As atoms replaced in Sb atoms by 25%. Moreover, it was found that Al/In doped samples have highly symmetric data features (same atomic species substitution). The narrow direct bandgap energy, E_g of Al_0.125Ga_0.875Sb_0.75As_0.25 material raised (0.4–0.6 eV) compared to conventional photovoltaic cell bandgap energy (which is generally less than 0.4 eV) with weak absorption coefficients. The thermoelectric properties of AlGaAsSb computed via Botlztrap code showed that the electrons made up the majority of the charge carriers in AlGaAsSb. This nanostructure material exhibited a higher and acceptable figure of merit and demonstrated a promising thermoelectric material for solar thermophotovoltaic applications.