## 1 Introduction  
The search for the diversification of generation sources and the increase in the percentage of participation of renewable energies, together with the saving and rational use of energy, are the axis for sustainable energy planning in a decarbonized future. The climatic change affects all countries of the entire world nowadays. Levels of carbon dioxide (CO\({}_{2}\)) and other greenhouse effect gases hit a record in 2020 [1]. Consequently, air and water temperature are increasing, the amount of ice and snow is decreasing, and the ocean level is growing up. According to experts, the climatic change effect in the environment could have fatal consequences. The Paris Agreement [2] is the first global climate change accord that looks to reduce global emissions by changing energy consumption and production policies. The employment of renewable source energy and policies that promote energy efficiency will help achieve the accorded objectives in this agreement. Total energy consumption in the residential sector supposes 25% of the total consumption in Europe [3]. Furthermore, the residential and tertiary sectors consume 60% of the electricity employed in the EU. The use of solar energy as a source of renewable energy in these sectors is a great alternative. Solar hybrid photovoltaic and thermal panels (PVT) can provide electricity and thermal energy by solar irradiation in a single device. Massive implementation of this technology would contribute to the reduction of energy consumption in buildings. PVT panels can be installed in almost any location on the roof of the construction. The generated electricity can be self-consumor sold to the grid. Thermal production of hybrid panels is in the form of hot water that can be employed for different purposes such as domestic hot water (DHW) production, space heating, and refrigeration by adsorption or employing a heat pump. A way of increasing the electricity production of PVT panels is the inclusion of thermoelectric generators (TEG) inside it. These devices, through Seebeck's effect, produce electricity from a gradient of temperature. The composition of TEGs is an essential factor in achieving a maximum conversion of thermal energy into electricity [4]. It is possible to find three types of thermoelectric generators in the market: high, medium, and low-temperature ranges [5]. Low-temperature range devices have a range work temperature between 25-125 \({}^{\circ}\)C, with a maximum work temperature of 250 \({}^{\circ}\)C. However, the efficiency decreases drastically when the generator works above 175 \({}^{\circ}\)C. Most commercial low-temperature range TEGs are composed of bismuth tellurium (Bi\({}_{2}\)Te\({}_{3}\)). The medium temperature range module works between 125-425 \({}^{\circ}\)C with a high limit temperature of 600 \({}^{\circ}\)C. The inconvenience of this type of TEG is its composition. Medium-range thermoelectric generators are made by tellurium (Te), a limited resource on Earth, and lead (Pb), a toxic material. TEGs that can work at high temperatures are composed of silicon (Si) as the main component. These devices provide high-efficiency parameters at temperatures between 425 \({}^{\circ}\)C and 725 \({}^{\circ}\)C. Depending on the application, a different type of TEG between these is selected. TEG technology has some advantages that makes it especially suitable in domestic poligeneration schemes [6; 7]. TEG devices are safe because they do not contain mobile parts, and no fluids are involved in their operation. Additionally, TEGs are simple, compact, light, silent, and not much maintenance is required. As for disadvantages, the elevated cost for high-temperature range TEGs and the relatively low efficiency of low-temperature range TEGs if thermal integration is not correct [8]. Integration of TEG modules in different applications has been intensively studied. Different review papers where the different applications can be consulted [5; 9]. The automobile industry is focused on finding alternative sources of energy.