Package structure of concentrated photovoltaic cell

Abstract

A package structure of a concentrated photovoltaic cell includes a ceramic base plate whereon a cavity is formed, the cavity having two opposite internal walls respectively having staircase structures, each having an upper step and a lower step; a photovoltaic chip disposed on a bottom surface of the cavity; a first electrode circuit path penetrating the ceramic base plate and with a top end electrically connected to the photovoltaic chip; a second electrode circuit path penetrating the lower steps on the two sides of the ceramic base plate and connecting with the photovoltaic cell through metal wires; and a transparent cover disposed on the upper steps for covering the cavity and the photovoltaic chip. A fabrication method for the aforementioned package structure is also provided. The aforementioned package structure has the advantages of being more efficient in heat dissipation and effective in protecting the photovoltaic chip.

Description

technical field [0001] The present invention relates to a manufacturing method of a concentrating solar cell packaging structure and its packaging structure, in particular to a concentrating solar cell packaging structure that uses a ceramic base with a stepped structure to cover a solar chip to improve heat dissipation efficiency. Manufacturing method and packaging structure thereof. Background technique [0002] Concentrating solar cells mainly use lenses to gather sunlight in a small area to improve power generation efficiency. When using concentrating solar cells for electrical energy conversion, due to the limitation of the spectral absorption capacity of the material itself, it is impossible to 100% light It can be converted into electric energy output, so the excess energy entering the solar cell is easy to form heat energy and accumulate in the battery, causing the temperature of the component to rise, resulting in a large increase in the dark current inside the batt...

AI Technical Summary

Problems solved by technology

[0002] Concentrating solar cells mainly use lenses to gather sunlight in a small area to improve power generation efficiency. When using concentrating solar cells for electrical energy conversion, due to the limitation of the spectral absorption capacity of the material itself, it is impossible to 100% light Can be converted into electric energy output, so the excess energy entering the solar cell is easy to form heat energy and accumulate in the battery, causing the temperature of the component to rise, resulting in a large increase in the dark current inside the battery and reducing the conversion efficiency of the battery

[0003] In the solar cell packaging structure, generally, the solar chip is directly attached to the circuit board, and the solar chip and the circuit board are electrically connected by wire bonding, and then epoxy resin is directly poured to isolate the solar chip from the circuit board. Contact with the external environment; however, there is a considerable difference between the thermal expansion coefficients of epoxy resin, solar chips and circuit boards, so after a long period of use, epoxy resin is easily corroded by moisture and separated from the circuit board, resulting in the inability to completely cover the solar chips , so that the service life of the solar chip is affected; on the other hand, due to the difference in the thermal expansion coefficient of the solar chip and the circuit board, the heat dissipation efficiency of the solar chip is reduced

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