INCREASING ENERGY EFFICIENCY IN SOLAR PANELS BY CHANGING THE COMPOSITION OF SEMICONDUCTORS

Аннотация

Solar energy is becoming an important source of sustainable and environmentally friendly energy in the modern world. Solar panels have become one of the main directions in the energy supply for sunny countries. However, the energy efficiency of solar panels is still limited, and continuous research is being conducted in this area to increase efficiency. The method of introducing impurities (doping) into semiconductor materials allows you to significantly increase the efficiency of solar panels. This article provides information on the principle of operation of solarpanels, theimportance ofintroducing impurities. Keywords: solar panels, semiconductors, impurities, photoelectric effect, silicon, germanium, efficiency, losses. Introduction. Solar energy is becoming an important source of sustainable and environmentally friendly energy in the modern world. Solarpanels operate on thebasis of thephotoelectric effect, in which semiconductor materials convert sunlight into electrical energy. Solar panels are mainly made of silicon (Si) or other semiconductor materials. When sunlight hits the panel, photons excite electrons and create an electric field. The efficiency of this process depends on the properties of the material, its structure, and its ability to absorb light. Photons excite electrons within the semiconductor, which creates an electric current. The low efficiency is due to energy loss (in theform of heat or recombination)and theoptical properties ofthe material [1]. The efficiency of solar panels (Figure 1) depends on the following factors: the material's ability to absorb light (only a certain part of the solar spectrum is converted into energy), electron recombination (free electrons recombine, leading to energy loss), and heat loss (efficiency decreases at high temperatures). The main materials used in solar panels include silicon, gallium arsenide (GaAs), cadmium telluride(CdTe), and perovskites. Each material has itsown advantages and disadvantages: Monocrystalline silicon - high efficiency (20-22%) and long service life, but high production cost. Polycrystallinesilicon -efficiency around 15-18%, but cheapertoproduce. Amorphous silicon -efficiency 6-8%, isthecheapest. Gallium arsenide (GaAs) - has an efficiency of up to 30%, but is expensive and is mainly used in space technology. Perovskites - in recent years have achieved efficiencies above 25%, but there are stability problems [2]. Doping of semiconductors is the process of adding specific chemical elements to change the electrical and optical properties of the material. Dopants are divided into two types: n-type http://www.internationaljournal.co.in/index.php/jasass 453 Volume 15Issue 06, June 2025 Impact factor: 2019: 4.679 2020: 5.015 2021: 5.436, 2022: 5.242, 2023: 6.995, 2024 7.75 dopants: Elements such as phosphorus (P) or arsenic (As) increase the number of electrons. p- type dopants: Boron (B) or gallium (Ga) create “holes” (positive charge carriers). The dopants form a p-n junction, creating an electric field, which is the basis of the photoelectric effect. By choosing theright amount and type ofdopants, theefficiency ofa solarcell canbeincreased. RESULTSANDANALYSIS There are several advantages to doping. Dopants increase the density of electrons or holes, which enhances current generation. Dopants broaden the light absorption spectrum of the material. Proper dopants minimizerecombination and heat loss[3]. Doping technologies 1.Thermal diffusion: Dopants are deposited onto thesurface ofthematerial at high temperatures. 2.Ion implantation: Dopant ions are introduced into thematerial at high energy. 3.Chemical vapor deposition (CVD): Dopants are added tothematerial using special gases. Phosphorus and boron are the most commonly used dopants in silicon solar panels. Recent studies show that additional dopants such as nitrogen (N) or aluminum (Al) can increase efficiency by1-2%. Forexample: -Phosphorus doping: increases theconductivity ofthe n-typelayer. -Boron doping: Strengthens thep-n junctionbyforming ap-type layer. -Combined doping: Efficiency can beoptimized byusing multipledopants simultaneously. High-efficiency silicon atoms, such as PERC (Passivated Emitter and Rear Cell) technology, are improved by doping. In this technology, electron recombination is reduced by using special layers and dopants [4]. Gallium arsenide andperovskite dopants: - GaAs solar cells have high efficiency (up to30%), but are expensive. The optical properties are improved by adding dopants such as selenium (Se) or zinc (Zn). Although GaAs is mainly used in space technology, research into itscost-effectiveness isongoing. - Perovskite materials have gained considerable attention in recent years, as their efficiency has exceeded 25%. By adding dopants such as methylammonium, cesium or lead, the stability and light absorption capacity of perovskites are increased. At the same time, the resistance of perovskites tomoistureand heat remains aproblem. Solar panels ar