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In this paper, a solar cell based on W O 3 /CdTe heterojunction was analyzed and optimized, for which the following structure of the Al/AZO/ W O 3 /CdTe/NiO/Ni device was proposed, which was numerically simulated by the SCAPS 1-D software. Using the software, the effect of the thickness and carrier concentration of the absorber layer (CdTe) and the window layer ( W O 3 ) was analyzed, and the optimal value of these parameters was found to be 2 µm and 10 15   c m − 3 for the CdTe layer and 10 nm and 10 19   c m − 3 for the W O 3 layer, respectively. The influence of the defect density of the W O 3 /CdTe interface on the performance of the proposed cell was also analyzed, simulating from 10 10 to 10 16   c m − 2 , obtaining better device performance at lower interface defect density. Another parameter analyzed was the operating temperature on the photovoltaic performance of the device, observing that the solar cell has a better performance at lower temperatures. Finally, a maximum optimized PCE of 19.87% is obtained with a Voc = 0.85 V, Jsc = 28.45 m A / c m 2 , and FF = 82.03%, which makes the W O 3 /CdTe heterojunction an interesting alternative for the development of CdTe-based solar cells. [ABSTRACT FROM AUTHOR]