What does heterojunction battery mean?

Heterojunction is a kind of solar cell. Solar cell is a device that converts solar energy into electric energy by photovoltaic effect, and its core is semiconductor PN junction. How does solar energy generate electricity? What is a PN junction? According to the different matrix materials, it can be divided into crystalline silicon battery and thin film battery. Among them, crystalline silicon battery is relatively mature and is the mainstream of the current market. The most critical index of solar cells is conversion efficiency. Before 20 15 years ago, the market was dominated by aluminum back-field (BSF) batteries with an efficiency of 19%. 20 15 uses PERC (passive emitter and back battery) battery, and the efficiency reaches 2 1.5%. At present, the photovoltaic industry mostly uses PERC batteries or various plus versions of PERC. With the development of various plus versions of PERC batteries, no matter what you do, you can't exceed 22% efficiency. People began to pay attention to the next generation technology-heterojunction battery. Heterojunction is a special PN junction, which is composed of amorphous silicon and crystalline silicon. It is an N-type battery in which an amorphous silicon film is deposited on crystalline silicon. HIT (heterojunction with intrinsic thin film) battery was first developed by Sanyo Company of Japan in 1990. Because HIT has been registered as a trademark by Sanyo, it is also called HJT, HDT or SHJ. Don't be dizzy when you see these words, they all mean the same thing.