Method for designing compact-type light splitting element for solar cell

Abstract

The invention provides a method for designing a compact-type light splitting element for a solar cell, which comprises the following steps: manufacturing an optical glass which comprises a first interface, a second interface and a third interface, wherein the included angle between the second interface and the third interface is 28 degrees; and plating a dielectric film on the first interface, and plating a dielectric film on the second interface, wherein the dielectric film plated on the first interface reflects the sunlight of which the energy is higher than 2.7eV and the reflected sunlight is absorbed by a first cell, and the sunlight of which the energy is lower than 2.7eV is transmitted to the optical glass. The dielectric film plated on the second interface reflects the sunlight of which the energy range is 1.4 to 2.4eV and the reflected sunlight is absorbed by a second cell through the third interface, and the sunlight of which the energy is lower than 1.4eV is transmitted and absorbed by a third cell. Therefore, the sunlight with different energy is absorbed by the solar cells with different band gap energy, and each stage of sub cell semiconductor material absorbs and utilizes the solar spectrum most matched with the band gap width thereof to realize full spectrum conversion of the sunlight. The conversion efficiency is higher, and the method is quite easy for large-scale production.

Description

Technical field [0001] The invention relates to a structural design method of a compact spectroscopic element for solar spectrum spectroscopy. Background technique [0002] As a clean and renewable energy utilization technology, solar power generation technology has continuously made breakthroughs. The continuous improvement of photoelectric conversion efficiency and the continuous reduction of manufacturing costs have made photovoltaic technology widely used in space and on the ground. In terms of efficiency improvement, due to the wide energy distribution in the solar spectrum, any semiconductor material can only absorb part of the energy. Photons below the band gap energy will pass through the battery, be absorbed by the back electrode metal, and be converted into heat energy; while the carriers generated by sunlight with much higher band gap energy will transfer energy to the material itself through thermalization In the lattice atom, these energy cannot be transferred to t...

AI Technical Summary

Problems solved by technology

However, multiple light splitting brings some problems at the same time, that is, after the sunlight passes through the light splitting element, there will be interface losses at the front and rear interfaces, resulting in the output efficiency of the solar cell module being much lower than the efficiency of the solar cell

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