Efficient Four-Terminal Perovskite/Silicon Tandem Solar Cells by Using an Anti-Reflective Polymer Film as an Intermediate Matching Layer

Abstract

Perovskite/silicon tandem solar cell is a promising candidate for highly efficient photovoltaic technologies. The 4T perovskite/silicon tandem solar cell comprises individual sub-cells that require no current matching. However, an optical loss to the bottom cell is a major issue, which is caused by an air gap serving as an optical spacer layer between sub-cells. This air gap results in a reduction in performance. In this work, commercial polydimethylsiloxane (PDMS) [Sylgard®184] was used as an intermediate matching layer (IML) in the 4T perovskite/silicon tandem cells to eliminate the air-spacer layer and increase the efficient performance. The PDMS anti-reflective polymer film was sandwiched between the top and bottom cells. The process has the potential to significantly improve the current density of silicon bottom cell with an active area of ~0.96 cm² from 13.39 mA/cm² (without an IML) to 14.95 mA/cm² (with an IML). The calculating overall performance of 4T perovskite/silicon heterojunction tandem cells with an air gap and an IML were achieved a PCE of 20.77% and 21.57%, respectively.

Keywords: Air-spacer layer, Anti-reflective polymer film, Perovskite/silicon tandem solar cells, Polydimethylsiloxane