Improve The Selective Emitter The Pole Solar Cell Module Quantum Efficiency Study

Photovoltaic power generation technology is one of the renewable energy technologies that various countries are vigorously exploiting. Crystalline silicon solar cell is the mainstream of PV industry, and the directions of its development still are improving conversion efficiency and reducing production costs. Selective emitter technology has proven to be an effective way to improve the conversion efficiency of cells, which can significantly improve the short wavelength response of cells. Solar cells usually have to be encapsulated into flat module to put into use by sealing with glue, lamination, etc. The transmittance of traditional encapsulation EVA drops in short wavelength because of adding anti-UV dose, which will greatly reduce the advantages of selective emitter solar cells. Therefore, it has been a pressing issue to study high transparent encapsulation materials to replace EVA.In this paper, firstly we use phosphosilicate glass laser doping method to achieve selective emitter monocrystalline silicon solar cell preparation. Then, on the basis of constructing the optical model of encapsulated selective emitter solar cell PV module, the concept of decibel is introduced and with it we describe the losses of light energy in the component parts of module. The impacts of various factors in module towards the incident energy are expressed as a simple and linear relationship. The definitions of external quantum efficiency and internal quantum efficiency of module are proposed so as to make it more convenient to study the effects of each encapsulation material on transfer efficiency of the PV module. Finally, according to the measured optical transmittance of EVA and silicone in the range of 200nm to 1200nm, the absorption losses of the two encapsulation materials are calculated; The spectral responses before and after encapsulation of single cells using EVA or silicone are tested, and then we calculates the short circuit current density attenuation for selective emitter solar cell modules using different encapsulation respectively in short wavelength 300nm to 500nm. By comparison, it is concluded that, using silicone can improve blue response of selective emitter solar cell module. In another word, using silicone can improve the quantum efficiency of module. This result has an important reference value on the solar cell module design and manufacturing.