Optimizing ZnO/CdS/CdTe bilayer structures for enhanced CdTe solar cell efficiency: A machine learning approach

• Published in: MRS advances Vol. 9; no. 9; pp. 640 - 645
• Main Authors: Krishnaiah, V. V. Jaya Rama, Prakash, V. N. V. Satya, Chandra, G. Rajesh, Sirisha, P. G. K., Mohan, K. Jagan, Rejeti, Venkata Kishore Kumar, Sundari, P. Neela
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 2024
• Subjects: Applied and Technical Physics; Biomaterials; Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Engineering; Materials Science; Nanotechnology; Original Paper
• ISSN: 2059-8521; 2059-8521
• DOI: 10.1557/s43580-024-00772-w

In the pursuit of enhancing solar cell efficiency, optimizing multiple parameters remains a significant challenge. Our simulation-based study aimed to identify the optimal thickness combination for ZnO/CdS/CdTe solar cells. Through meticulous analysis of experimental optical absorbance data and electrical properties, we discovered that thicker CdS layers, despite being a compatible partner for CdTe, led to efficiency reduction due to high optical absorbance. In contrast, a ZnO/CdS bilayer window with a 250 nm/50 nm thickness combination demonstrated superior efficiency owing to ZnO’s higher bandgap and lower absorbance. Moreover, our investigation concluded that a 2.5 μ m thick CdTe absorber layer is sufficient for effective conversion, yielding a remarkable 17.66% efficiency with a 73.7% fill factor. These findings offer valuable insights into optimizing solar cell components, paving the way for improved designs with enhanced conversion efficiencies. Graphical abstract