A temperature field regulation mechanism that facilitates the control of directional solidification and flat liquid-solid interface

Abstract

The invention discloses a thermal field regulating controlling mechanism beneficial for controlling of directional solidification flat straight liquid solid interfaces. According to the thermal fieldregulating controlling mechanism beneficial for controlling of directional solidification flat straight liquid solid interfaces, in a furnace body, the outer rim of a thermal insulation circular plateis contacted and connected with the internal wall of the furnace body, and the inner rim is contacted with the external wall of a cooling disk; a crucible is placed on the upper plate surface of thecooling disk; the crucible is sleeved with a thermal insulation barrel, a graphite heating body, and an electromagnetic coil; a cooling circular plate is provided with a circular groove; the axial bottom end of the thermal insulation barrel is designed to penetrate through the circular groove; the lower part of a thermal insulation circular plate is provided with an adjusting barrel; the upper endof the adjusting barrel is connected with the thermal insulation barrel; an adjusting barrel is driven by an elevating mechanism to move upward and downward; the cooling disk comprises a cylindricalhousing; a first circular gas distribution chamber and a second circular gas distribution chamber which are sleeved with each other are arranged in the cylindrical housing; separating plates are arranged in the two distribution chambers; the part below each separating plate is designed to be a buffer chamber, and the part above each separating plate is provided with a plurality of gas distributionfins; the bottom of each buffer chamber is communicated with a gas inlet pipe; and the bottom of the housing is provided with a gas outlet pipe. The thermal field regulating controlling mechanism isbenefit for solving of a problem that center supercooling degree is too large, unfavorable influences on solidification melt such as vibration are avoided, it is beneficial for polysilicon growth; energy is saved, and environmental protection is realized.

Description

technical field [0001] The invention relates to the field of photovoltaic technology, in particular to a temperature field regulation mechanism that is beneficial for controlling directional solidification and flat liquid-solid interface. Background technique [0002] At present, the development and utilization of solar energy is mainly in the form of solar cells. Solar cells are devices that directly convert light energy into electrical energy through the photoelectric effect. Silicon is known for its high abundance, high voltage resistance, high temperature resistance, and large crystal band width Compared with other semiconductor materials, it has comprehensive advantages such as small size, high efficiency, long life, strong reliability, stable performance and non-toxicity, mature preparation technology and wide range of uses, so it has become the main material of solar cell research, development, production and application. Crystalline silicon cells have become the lead...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the existing operation process of using the cooling plate alone to cool the bottom of the crucible for directional solidification or combined with moving the solidified melt downwards out of the induction area, so as to obtain a unidirectional temperature gradient, there is a central overshoot. Insufficiencies such as cold or solidified melt vibrations have adverse effects on crystal growth. The present invention provides a temperature field regulation mechanism that solves the above problems and is beneficial to control the directional solidification and flat liquid-solid interface.

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