The PV industry has been developing rapidly for ten years, so what are the directions with strong development potential in the future?

　　(1) HJT: Higher conversion efficiency, which is expected to become the future development direction of solar cells

　　HJT technology: HJT battery has a heterojunction with an intrinsic amorphous layer (Heterojunction with Intrinsic Thin-Layer), which is a hybrid solar cell made of a crystalline silicon substrate and an amorphous silicon film. It uses an N-type monocrystalline silicon wafer as a substrate, and deposits an intrinsic amorphous silicon film and an N-type amorphous silicon film on the front of the silicon wafer in sequence, and an intrinsic amorphous silicon film and a P-type amorphous silicon film are sequentially deposited on the back. A transparent conductive oxide film (TCO) is deposited on both sides of the hetero-amorphous silicon film, and a metal electrode is formed on the top layer on both sides of the TCO.

　　The conversion efficiency of HJT battery technology is higher: According to CPIA statistics, the average conversion efficiency of HJT reaches 23%, which is higher than the mainstream PERC technology route battery, and the conversion efficiency is expected to continue to increase to more than 25.5% in the next five years.

　　The HJT process is simple, mainly including cleaning and texturing, amorphous silicon deposition, TCO film deposition and electrode production. The current HJT production process has higher requirements for equipment and materials, and higher costs, but there is a lot of room for price reductions in the future.

　　According to Solarzoom's forecast, HJT's production capacity is expected to reach 3-5GW by the end of 2020, 10-20GW by the end of 2021, 50GW by the end of 2022, and more than 100GW by the end of 2023.

　　(2) BIPV, BAPV: PV building integration, both power generation, building materials, and investment functions

　　BIPV is a solar PV power generation system formed by the PV system itself as a part of the building.

　　BAPV refers to solar PV power generation systems installed on existing buildings

　　These two modes not only have the function of generating electricity, but also have the functions of building components and materials, which play the role of force, wind, rain, and heat insulation, and can even enhance the beauty of the building, and can also obtain return on investment through surplus electricity. .

　　According to data released by Grand View Research, the global BIPV market in 2019 was USD 13.1 billion and is expected to reach USD 14.8 billion in 2020, with a compound annual growth rate of 23.1% from 2020 to 2027.

　　In the fourth quarter of 2019, Tesla released the third-generation Solar Roof, the star product of solar roofs, with obvious advantages in appearance and overall cost. The shape of Solar Roof is similar to ordinary bricks and tiles, and it is natural and beautiful. The surface is textured glass with embedded PV cells. Compared with the PV module Solar Panel + new roof solution, the integrated Solar Roof solution reduces the cost by US$56/m2 and US$1.1/watt, respectively; compared with the pure roof, the new solar roof cost is US$1.2/watt. US residents The electricity fee is $0.22/kWh, and the cost can be recovered in about 5 years. This is a very attractive high-return project.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, PV energy storage, UPS, data center and other industries.

　　Solar power generation system with lithium battery energy storage system is a very promising clean energy.