Selective Emitter Solar Cells And Photovoltaic Engineering Study Of The Optimum Tilt Angle

Tow parts are included in the paper: The study on the single crystalline silicon selective emitter solar cell and study on optimum slope design in PV engineering. In the first part. the basic principle of the solar cell is summarized, the theory of selective emitter solar cell is expounded, the structure has been designed and the single crystalline silicon selective emitter solar cells were manufactured with the process of the diffusion Si02 barriers. photolithography and one phosphorous diffusion. So far. for 2x2cm2 single crystalline silicon, the highest efficiency is 13.2%. In the second part, based on Hay's anisotropic diffuse radiation model, a general theoretical total solar radiation formula has been derived, which can used to calculate the total radiation on the sloped surface for arbitrary slope and azimuth angle and a program has been developed with C language of computer, which can be used to calculate the annual total radiation and the optimum slope. The theory and the program have been applied to design a fixed grid-connected PV system optimum slope in Lijiang, Yunnan, China. The calculations bring out the results that the optimum slope of a fixed photovoltaic array is 340, when it faces south and that the optimum slope is 260, when its azimuth angle is equal to 320 from south to east. 3.91% of the annual output of the PV system will be reduced for the second scenario (azimuth angle is equal to 320 from south to east).