The rapid rise in the number of fossil fuel uses over the last few decades has increased carbon dioxide (CO₂) emissions. The purpose of implementing renewable energy solutions, such as solar, hydro, wind, biomass, and other renewable energy sources, is to mitigate global climate change worldwide. Solar energy has received more attention over the last few decades as an alternative source of energy, and it can play an essential role in the future of the energy industry. This is especially true of energy solutions that reduce land use, such as off-grid and on-grid solar rooftop technologies. This study aims to evaluate the energy conversion efficiency of photovoltaic (PV) systems in tropical environments. It also explores the effect of growing plants beneath PV panels. Two identical grid-connected PV systems—each containing five solar panels—were installed. The overall power production of each PV system was about 1.4 kWp. All the collected data were processed and analysed in the same way and by the same method. The PV systems were installed in two different environments—one with the possibility of growing the plants beneath the PV panels (PViGR module) and one with no possibility of growing the plants beneath the PV panels (PViSR module). The experiments were conducted in the Bo Yang District of Songkhla, Thailand over a 12-month period. Our findings indicate that green roof photovoltaic (GRPV) systems can produce around 2100 kWh of electricity in comparison to the 2000 kWh produced by other solar energy systems. Thereby, growing plants beneath PV panels increases electricity production efficiency by around 2%. This difference comes from the growing of plants underneath GRPV systems. Plants do not only help to trap humidity underneath GRPV systems but also help to cool the PV panels by absorbing the temperature beneath GRPV systems. Thus, in the production of electrical energy; the system was clearly showing significant differences in the mentioned results of both PV solar systems, which are evident for great energy efficiency performances in the future.

The antimony sulphide (AnS) solar cell is a relatively new photovoltaic technology. Because of its attractive material, optical, and electrical qualities, Sb2Se3 is an excellent absorption layer in solar cells, with a conversion efficiency of less than 8%. The purpose of this research is to determine the best parameter for increasing solar cell efficiency. This research focused on the influence of absorber layer defect density and the n/i interface on the performance of antimony trisulfide solar cells. The researchers designed the absorber thickness values with the help of the SCAPS-1D (Solar Cell Capacitance Simulator-1D) simulation programme. For this purpose, they designed the ZnS/Sb₂Se₃/PEDOT: PSS planar p-i-n structure, and then simulated its performance. This result confirms a Power Conversion Efficiency (PCE) of ≥25% at an absorber layer thickness of >300 nm and a defect density of 10¹⁴ cm⁻³, which were within the acceptable range. In this experiment, the researchers hypothesised that the antimony triselenide conduction band possessed a typical energy of ≈0.1 eV and an energetic defect level of ≈0.6 eV. At the n/i interface, every condition generated a similar result. However, the researchers noted a few limitations regarding the relationship between the defect mechanism and the device performance.

In the various protected areas such as nature reserves and national parks in Vietnam, ranger patrols are crucial for protecting forest resources against the increasing threats from fringe communities. Previous studies have investigated ranger patrol efforts (RPEs) in conservation areas using conventional measures in terms of illegal activities encountered, but there has been little research into indices related to RPEs in the field, both worldwide and particularly in Vietnam. This paper explores various indices of RPEs and other aspects of forest patrolling at a local level. The number of rangers and patrol-days strongly influences the distance walked and the number of patrol-hours. However, neither the rainy season nor the Lunar New Year festival had any significant effect on patrol efforts, nor was there any effect on the relative altitude covered or the speed of patrolling during the long Lunar New Year vacation. Management responsible for protecting forest areas needs to consider the full scope of rangers’ efforts and identify the qualities of motivated staff. Our findings suggested ways in which rangers’ capacity to promote conservation may be assessed in the future.

Protected areas, nature reserves and national parks in Vietnam, has considered foot patrols under traditional law enforcement with local forest guard (LFG). The participant between LFG and rangers in protected areas has been applied as commons way of patrolling on forest protection. However, very few studies have considered the contribution of LFG performance of patrolling activity with GPS-based monitoring system from Nam Tien forest station (FS), Pu Hu nature reserve (NR). Through the contribution of the monthly report was collected and the reliability of patrol data was analyzed in the central office. This study explores that the number of LFG was affected by the distance and patrol hours in the working field (P < 0.01). It could also be reducing the rangers’ law enforcement if the limitation of LHG’s performance was considerably significant. Admittedly, the illegal activity might be declined by ranger’s efforts in term of patrolling activity. This study highlights the importance of LFG performance for protected area management was related to the efficacy of conservation targets.