Patent ID: 8178409

Claim:
A manufacturing method of a semiconductor device with alternately arranged P-type and N-type thin semiconductor layers, comprising the following steps: step1: depositing dielectric on a P-type epitaxial layer; step2: forming trenches in the dielectric and the P-type epitaxial layer by lithography and etching; step3: forming thermal oxide film on the surfaces of the trenches and the dielectric; step4: depositing N-type silicon on the thermal oxide film, wherein the N-type silicon is polysilicon or amorphous silicon; step5: diffusing the N-type impurity of the N-type silicon within the trenches through the thermal oxide film into the P-type epitaxial layer by thermal diffusion technique; step6: completely oxidizing the N-type silicon to fully fill the trenches with oxide; step7: removing the oxide and the dielectric on the P-type epitaxial layer.