Abstract: A tunnel oxide layer, an N-type bifacial crystalline silicon solar cell and a method for manufacturing the same are provided. The method for manufacturing the tunnel oxide layer includes forming excess -OH on a back side of a silicon wafer, and depositing the tunnel oxide layer on the back side of the silicon wafer by a Plasma Enhanced Atomic Layer Deposition method. The method for manufacturing the N-type bifacial crystalline silicon solar cell can include following steps: performing cleaning, texturing, boron diffusing, and alkaline polishing on an N-type silicon wafer, sequentially forming a P-type doped layer, a passivation layer, and an anti-reflection layer on a front side of the alkaline-polished N-type silicon wafer, and forming a tunnel oxide layer on a back side of the alkaline-polished N-type silicon wafer, followed by forming an N-type doped polysilicon layer, and after annealing, forming an anti-reflection layer.

Abstract: Provided is an electrical heating mold. The electrical heating mold includes a mold casing and an electrical heating device disposed in the mold casing. The electrical heating device includes an upper annular heating resistor element group configured to perform heating around a bottleneck, a middle annular vertical-inserted columnar heating resistor element group configured to perform heating around a bottle body, and a lower annular heating resistor element group configured to perform heating around a bottle bottom. The electrical heating mold has a good heating effect, a low processing cost and a simple structure.

Abstract: Provided is an electrical heating mold. The electrical heating mold includes a mold casing and an electrical heating device disposed in the mold casing. The electrical heating device includes an upper annular heating resistor element group configured to perform heating around a bottleneck, a middle annular vertical-inserted columnar heating resistor element group configured to perform heating around a bottle body, and a lower annular heating resistor element group configured to perform heating around a bottle bottom. The electrical heating mold has a good heating effect, a low processing cost and a simple structure.