The thin-film battery is the core unit of photoelectric conversion, however, it needs to be packaged and protected and made into photovoltaic modules to meet the requirements of practical applications (mechanical performance and stability, etc.). However, thin-film battery modules need to use a large number of high-molecular organic polymer materials such as EVA or PVB. In this paper, new thin-film module design technologies are used to reduce or even eliminate the use of these high-molecular organic chemical materials. Basically, inorganic materials are used to make thin-film photovoltaic modules more efficient. Environmental protection economy. I. Introduction The thin-film battery is the core unit of photoelectric conversion, however, it needs to be packaged and protected and made into photovoltaic modules to meet the requirements of practical applications (mechanical performance and stability, etc.). However, thin-film battery modules need to use a large number of high-molecular organic polymer materials such as EVA or PVB. In this paper, new thin-film module design technologies are used to reduce or even eliminate the use of these high-molecular organic chemical materials. Basically, inorganic materials are used to make thin-film photovoltaic modules more efficient. Environmental protection economy. Second, the conventional thin film battery classification Thin film batteries are generally classified into the following categories: amorphous silicon, gallium arsenide III-V compounds, cadmium sulfide, cadmium telluride, and copper indium gallium selenide thin film battery modules. CdTe is a II-VI compound semiconductor with a bandgap of 1.5 eV, which is very compatible with the solar spectrum and is most suitable for photoelectric energy conversion. It is a good PV material with high theoretical efficiency (28%) and stable performance. Has always been valued by the photovoltaic industry, is a relatively rapid development of a thin film battery. Cadmium telluride is easily deposited into large-area thin films with high deposition rates. CdTe thin-film solar cells are usually based on CdS/CdT e heterojunctions. Although the difference between CdS and CdTe and the lattice constant is 10%, the heterojunction composed of them has excellent electrical properties, and the fill factor of the fabricated solar cell is as high as FF = 0.75. Amorphous silicon thin-film batteries are generally formed by PECVD (plasma-enhanced chemical vapor deposition) method to decompose and deposit high-purity silane and other gases. This production process can be completed continuously in a plurality of vacuum deposition chambers during production to realize mass production. Due to the low deposition and decomposition temperature, thin films can be deposited on glass, stainless steel plates, ceramic plates, and flexible plastic sheets, which are easy to produce on a large scale and have a low cost. The structure of an amorphous silicon-based solar cell prepared on a glass substrate is: Glass/TCO/pa-SiC:H/ia-Si:H/na-Si:H/Al, amorphous prepared on a stainless steel substrate The structure of the silicon-based solar cell is: SS/ZnO/na-Si:H/ia-Si(Ge):H/pa-Si:H/ITO/Al. The CIGS thin-film solar cell is a new type of photovoltaic cell product that has attracted people's attention due to its high efficiency, no recession, radiation resistance, long life, and low cost. Currently, the National Renewable Energy Laboratory of the United States A cell with a maximum efficiency of 19.9% ​​was prepared on a glass substrate using a co-evaporation three-step process. Recently, the CIGS small-area battery efficiency has created a new record, reaching 20.1%. Third, the structure of a new thin-film battery module design The structural design of a new thin-film battery module is shown in Figure 1: The structure is described as follows: The first layer: smooth surface, using high-transmittance photovoltaic conductive glass Second layer: Conductive glass is used to produce thin-film photoelectric conversion units (thin-film batteries) by coating technology. The third layer: using nitrogen or other inert gas filling, the thin film battery protection, to avoid oxidation and corrosion of thin film batteries. Fourth floor: back glass, using ordinary tempered glass. Component border and periphery: 1) A glass member joined with the front glass may be used, and a member that is joined with the back glass is also used on the back, and the front and back members are mechanically engaged with each other. Silicone sealant seal. 2) A separate glass member or metal member can be used to seal the silicone sealant. 3) The contact surfaces of components and components require sealing and mechanical protection. V. Conclusion 1) The new thin-film module structure eliminates the use of EVA, PVB, and inert gases such as nitrogen to chemically protect the thin-film batteries, thereby greatly reducing the application of high-molecular organic materials. 2) Frames, abandon the aluminum frame, use integrated glass components to connect, sealant seal, to ensure mechanical mechanical requirements, transportation and installation requirements. 3) The assembly can meet the application requirements for building integration (height is limited), and it can also be applied to ground power stations, street lamps and other applications. 4) Considering the mechanical requirements, the back glass can be filled and modified to meet the mechanical properties such as the toughness, bending, and tensile strength of the component. 5) Environmental protection economy.
GaAs is a III-V compound semiconductor material with an energy gap of 1.4 eV, which is exactly the value of high-absorption solar light. It is suitable for matching with the solar spectrum and can withstand high temperatures. Under the condition of 250°C, the photoelectric conversion performance remains Very good, the highest photoelectric conversion efficiency of about 30%, especially suitable for high-temperature condenser solar cells. 
New Thin Film Battery PV Module Design Technology