Author:
Kuang Yawei,Ma Yulong,Zhang Debao,Wei Qingzhu,Wang Shuchang,Yang Xifeng,Hong Xuekun,Liu Yushen
Abstract
Abstract
Perovskite solar cells are used in silicon-based tandem solar cells due to their tunable band gap, high absorption coefficient and low preparation cost. However, the relatively large optical refractive index of bottom silicon, in comparison with that of top perovskite absorber layers, results in significant reflection losses in two-terminal devices. Therefore, light management is crucial to improve photocurrent absorption in the Si bottom cell. In this paper, nanoholes array filled with TiO2 is introduced into bottom cells design. By finite-difference time-domain methods, the absorption efficiency and photocurrent density in the range of 300–1100 nm has been analyzed, and the structural parameters have been also optimized. Our calculations show the photocurrent density which tends to be saturated with the increase in the height of the nanoholes. The absorption enhancement modes of photons at different wavelengths have been analyzed intuitively by the distribution of electric field. These results enable a viable and convenient route toward high efficiency design of perovskite/Si tandem solar cells.
Funder
Jiangsu Province Natural Science Research Programs of higher schools
fund of Changshu Industry Technological Innovation
Fundação de Apoio à Pesquisa e à Inovação Tecnológica do Estado de Sergipe
Hunan Provincial Science and Technology Department
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Subject
Condensed Matter Physics,General Materials Science