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Silicon heterojunction (SHJ) technology marks a notable development in the photovoltaic sector, paving the way for solar cells with very high efficiency. At its core, SHJ technology is characterized by the formation of a heterojunction between crystalline silicon (c-Si) and carrier-selective materials, which are not necessarily based on intrinsic/doped a-Si:H. In this research, a transparent conductive multilayer structure consisting of MoOx/Ag/MoOx is utilized on the front illuminated side as hole-selective contacts, while a metal/organic polymer Al/C60 is employed as a full-area rear electron-selective contact. This configuration results in an Ag/MoOx/Ag/MoOx/n-Si/C60/Al heterojunction solar cell. The device was extensively investigated electrically under varying temperatures using techniques such as impedance spectroscopy, capacitance–voltage, and current–voltage measurements in dark conditions. Furthermore, the SHJ solar cell achieved an efficiency of 7.8% under 1 sun illumination, demonstrating its potential in the field of photovoltaics. These findings underscore the potential of this multilayer structure to enhance SHJ solar cell performance, marking a step forward in photovoltaic technology with implications for more efficient and cost-effective solar energy solutions. [ABSTRACT FROM AUTHOR]

For innovative application in wastewater treatment techniques, MnO-Fe2O3 nanocomposites were successfully synthesized using the sol–gel auto-combustion method at different temperatures for the adsorption of 137Cs and 60Co radionuclides from aqueous solution. The characterization of these nanocomposites was carried out through FT-IR, SEM-EDX, and X-ray diffraction. These nanocomposites were employed as adsorbent materials for the removal of 137Cs and 60Co radionuclides from simulated radioactive waste solutions. The study involved a series of experiments aiming to demonstrate the MnO-Fe2O3 nanoparticles' exceptional adsorption potential concerning 137Cs and 60Co. Additionally, the investigation delved into how variations in temperature, dose amount, contact time, and pH value influence the adsorption dynamics. Due to their high specific surface area, the synthesized MnO-Fe2O3 nanoparticles had high adsorption capacity of more than 60% and 90% for 137Cs and 60Co, respectively. By investigation of kinetics and adsorption isotherms, pseudo-second-order reaction and the Langmuir model turned out to fit well for the adsorption of 137Cs and 60Co onto the MnO-Fe2O3 nanocomposites. Moreover, a thermodynamic analysis revealed that the adsorption process was spontaneous for both target metals and the adsorption of 60Co was endothermic, whereas the adsorption of 137Cs was exothermic. [ABSTRACT FROM AUTHOR]