Light trapping structure for thin film solar cell

Abstract

The invention relates to a light trapping structure for a thin film solar cell, which is basically characterized by being positioned at the back light surface of a solar cell light absorbing area, a dThe invention relates to a light trapping structure for a thin film solar cell, which is basically characterized by being positioned at the back light surface of a solar cell light absorbing area, a diffraction grating 1, a distributed Bragg reflector (DBR) 2 and a metal reflector 3 are sequentially arranged from one side of the solar cell light absorbing area, wherein the diffraction grating 1 iniffraction grating 1, a distributed Bragg reflector (DBR) 2 and a metal reflector 3 are sequentially arranged from one side of the solar cell light absorbing area, wherein the diffraction grating 1 increases light diffraction efficiency, the DBR2 and the metal reflector 3 jointly increase the reflectivity of the light, and the metal reflector 3 can greatly increase the light trapping efficiency ofcreases light diffraction efficiency, the DBR2 and the metal reflector 3 jointly increase the reflectivity of the light, and the metal reflector 3 can greatly increase the light trapping efficiency ofthe light trapping structure and reduce the pair numbers of the DBR 2, so that the light trapping structure can be easily manufactured; and a medium buffering layer 4 can be further arranged between the light trapping structure and reduce the pair numbers of the DBR 2, so that the light trapping structure can be easily manufactured; and a medium buffering layer 4 can be further arranged betweenthe DBR 2 and the metal reflector 3.the DBR 2 and the metal reflector 3.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a light-trapping structure for thin-film solar cells. Background technique [0002] The development and utilization of solar energy has become a strategic decision for sustainable energy development in countries all over the world. Both developed countries and developing countries have formulated medium and long-term development plans, taking photovoltaic power generation as the hope of human future energy. However, as an integral part of the overall energy structure of society, the proportion of solar energy is still less than 1% at present. The main reason for this situation is that the cost of solar cells is too high. At present, the retail price of crystalline silicon solar cell modules, which accounts for nearly 90% of the photovoltaic market, is still at 4.78$ / Wp, and the most important cost is the cost of silicon wafers with a thickness of about 170-220 microns. [0003] There...

AI Technical Summary

Problems solved by technology

However, as an integral part of the overall energy structure of society, the proportion of solar energy is still less than 1% at present. The main reason for this situation is that the cost of solar cells is too high

Some of these structures do not increase the light trapping effect significantly, and some have complex preparation processes

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