Rached Ganouni, Mourad Talbi, Hatem Ezzaouia, Comparison Between Experimental and Theoretical Model of Highly-Efficient GaInP/Si Tandem Solar Cells, Journal of Engineering and Applied Sciences, Volume 13,Issue 9, 2018, Pages 2544-2549, ISSN 1816-949x, jeasci.2018.2544.2549, (https://makhillpublications.co/view-article.php?doi=jeasci.2018.2544.2549) Abstract: Si based tandem solar cells speak to a contrasting option to conventional compound III-V multi-junction cells as a promising approach to accomplish high efficiencies. In this study, we compare between an experimental model of a novel 4-terminal tandem cell design with a Back-Junction Back-Contacted (BJBC) c-Si and a theoretical model of a new structure of tandem solar cell based on c-Si using MATLAB code. The result obtained shows that we can arrived to the same efficiency η = 28% with the both of model but with less cost and problems of physics coherence in our model. Keywords: Tandem;solar cell;c-Si;efficiency 0 = 28%;model;promising