### Innovative PV Technologies  
Photovoltaic panels are an emerging technology for local power production in the building sector. They can be placed on the building rooftop with the proper orientation and inclination, and in this case, they are called building-applied photovoltaics (BAPVs). Alternatively, they can be integrated into facades, and in this scenario, they are referred to as building-integrated photovoltaics (BIPVs). The efficiency of the photovoltaic cells is not so high and usually ranges between 15% and 20% according to recent PV designs [10]. Comparatively, BIPV photovoltaic cells are characterized by a lower efficiency than roof PV technology [11]. A critical factor in PV performance is the reduction in PV cell performance due to the increase in cell temperature. It is remarkable to state that PV cell losses are approximately equal to 0.5% of the electricity production for every Celsius degree rise [10]. According to the existing literature, various techniques have been examined to achieve PV cell cooling and consequently PV efficiency enhancement. One promising solution is radiative cooling, a technique that incorporates a proper layer (coating) on the PV upper surface, aiming to increase its surface emissivity and therefore properly cool the PV cell [12]. Specifically, recent advancements in materials science have led to the development of photonic structures and coatings that present high reflectance on the solar spectrum and high emittance within the mid-infrared range. These materials can effectively reflect incoming solar radiation and emit heat through the atmospheric window, thereby cooling PV panels [13][14]. [PERSON] et al. [15] focused on the fabrication of two distinctive structures of silver/silica microsphere composites (SiO2@Ag NPs), conjugating two types of CdSe/ZnS core/shell QDs. These hybrid nanostructures are effectively employed as light-absorbing and energy-down-conversion layers in copper indium gallium selenide solar cells. A considerable temperature reduction of 3.2 \({}^{\circ}\)C was observed in copper indium gallium selenide cells when the hybrid structures were used for the top of the cell under high solar irradiation. According to their results, a reduction in temperature rise of 21% was reported. Moreover, they concluded that the PV efficiency was enhanced by about 0.53%. In another work, [PERSON] et al. [16] found that radiative cooling leads to an average reduction in cell temperature of 1 to 3 K, and the respective enhancements of the electrical efficiency were within the range of 0.43% to 1.07%. However, the integration of radiative cooling technologies into PV systems poses several challenges, including material durability, cost-effectiveness and the integration process itself. Moreover, the effectiveness of radiative cooling depends on atmospheric conditions like humidity and cloud cover, which can influence the transparency of the atmospheric window. Despite these challenges, the potential energy savings and efficiency gains make radiative cooling a compelling area for further research and development. Another cooling technique regards the incorporation of phase-change materials (PCM) on the PV's back side. This technique aims to absorb the heating production and avoid the overheating of the cell by keeping it at a temperature level close to the melting temperature level of the PCM. Practically, the heat rejection of the PV cell leads to the liquefaction of the PCM with a very small temperature increase demand, and protects from the development of high temperatures in the PV unit. A critical design parameter in the PCM-PV design is the selection of a proper PCM with a suitable melting temperature that enables the effective cooling of the cell by considering the operating ambient conditions [17]. Usually, the selected materials are paraffin waves and salt hydrates due to their suitable thermal properties and relatively low cost [18]. [PERSON] et al.