HJT is an amorphous silicon film deposited on crystalline silicon. It combines the advantages of crystalline silicon cells and thin film cells, and has the advantages of high conversion efficiency, low process temperature, high stability, low attenuation rate, and double-sided power generation. Its technology is disruptive. In 2019, the average conversion efficiency of traditional monocrystalline cells in the photovoltaic industry was 22.3. There is little room for further improvement, and the theoretical limit is about 24.
The conversion efficiency of HJT batteries can reach 23-24, and the theoretical efficiency is as high as about 28. The minimum conversion efficiency is the upper limit of traditional mainstream batteries. With the gradual reduction of HJT costs, HJT industrialization is about to be implemented, which will be a major change in the photovoltaic industry chain.
HJT battery will be a revolutionary new photovoltaic technology;
The research report points out that the photovoltaic industry will have a technology iteration almost every 2-3 years, and the battery conversion efficiency is the highest Key indicators. As PERC's efficiency mining gradually approaches the efficiency limit of 24.5.
Heterojunction cells are considered a revolutionary technology for the next generation of photovoltaic cells, with higher efficiency, simpler processes and lower energy consumption. In the long run, they represent the development direction of future battery technology.
At present, cost is the key factor restricting the development of HJT technology. The production cost of HIT cells is about 0.92 yuan/W, including silicon wafers, paste (low-temperature silver paste), target materials, equipment depreciation, etc.
The costs are 0.5, 0.23, 0.05, 0.05, and 0.1 yuan/W respectively, and the proportions are 54.3, 25, 5.4, 5.4, and 10.8 respectively. Compared with PERC (0.71 yuan/W), the production cost of HIT batteries is still 0.21 yuan/W higher.