Influence of Mole Fraction, Front and Back Contact on the Photovoltaic Performance of AlxGa1-xAs / AlxIn1-xAs /GaxIn1-xAs Heterojunction Solar Cell

Abstract

Energy is essential to life, along with all living creatures. Energy is needed in every aspect of life. But, recently, the traditional sources of energy are going to extinct. That is why people are getting interested in renewable energy. Among all the sources of renewable energy sun is the best source. Solar energy can be collected from the Sun, and as long as the Sun lives, this energy can be produced. The total power of solar radiation touching the surface of the atmosphere immediately facing the Sun is approximately 1,360 watts per square meter. Solar cells can generate 15-20% of energy from this. In some cases, it can even hit 42%. In this thesis book, variation in the photovoltaic performance of AlxGa1-xAs/AlxIn1-xAs/ GaxIn1-xAs heterojunction solar cell has been studied by changing the mole fraction (x) and front and back contact parameter (PHIBO and PHIBL) of the solar cell. Simulations were done using the one-dimension(1D) simulation program 'Analysis of Microelectronic and Photonic Structures' (AMPS 1D) software. With the help of this software light J-V characteristics curve was obtained for different combinations of alloy composition of the layer materials. Also, the effect of changing PHIBO and PHIBL on this curve (Under AM1.5G) was observed. For understanding the effect of mole fractions, three designs were made for different combinations of the mole fraction. Among these three designs, the best result was achieved for x = 0.8, 0.5, and 0.9 with 21.426% efficiency for top, middle and bottom layers. For this design, it was observed that the solar cell's photovoltaic performance by increasing PHIBO (keeping PHIBL constant) and PHIBL (keeping PHIBO constant). By increasing PHIBO and decreasing PHIBL, the performance got better and, the highest efficiency (30.435%) is for PHIBO = 2.3eV and PHIBL = 0.2eV among all the combinations. In this book, we have thoroughly discussed the process of our research and works.