Abstract: Heterojunction with intrinsic thin-layer (HIT) consist of thin amorphous silicon layers deposited on crystalline silicon wafers, which forms a silicon heterojunction (SHJ) structure with the major advantages of full exploitation of the excellent passivation properties of a-Si∶H films, and consequently, the energy conversion efficiencies higher than homogenous cells. The paper provides an introduction on the development and the structure of the HIT solar cells, and a discussion upon the wafer layers, the a-Si (undoped/doped) layers, the TCO (transparent conducting oxides) films and the metal grid electrodes from the perspectives of fabrication processes, the principle of passivation, and the band gap. Finally a prospect on the future trends are also proposed.
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2018, Vol. 32 
