On October 31, TCL Zhonghuan announced the latest monocrystalline silicon wafer prices. Compared with the prices announced on September 8, the prices of P-type 150μm thick and N-type 150μm thick/130μm thick silicon wafers all decreased.
The main material of solar cells is the semiconductor silicon. A solar cell is a photoelectric element that can convert energy, and its basic structure is formed by bonding P-type and N-type semiconductors. The most basic material of semiconductor is ‘silicon’, which is non-conductive, but if different impurities are doped in the semiconductor, it can be made into P-type and N-type semiconductors. Phosphorus doping in monocrystalline silicon is N-type, and boron doping in monocrystalline silicon is P-type. P-type is hole-conducting and N-type is electron-conducting. The P-type semiconductor lacks a negatively charged electron, which can be regarded as an additional positive charge, and the potential difference between the N-type semiconductor and an additional free electron to generate current. So, when the sun shines, light can excite electrons in silicon atoms, creating convection of electrons and holes. These electrons and holes are affected by the built-in potential and are attracted by the N-type and P-type semiconductors respectively, and gather at the two ends. At this time, if the outside is connected with batteries to form a loop, this is the principle of solar power generation. Below is a picture of the finished solar cell.
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