SC02 – Numerical simulation of eco-friendly 4-terminal all perovskite tandem solar cell using novel HTL structure in the bottom sub cell

In this paper, we proposed a free-pb 4-terminal (4T) all perovskite tandem solar cell (APTSC) as reference with the power conversion efficiency (PCE) of 26.42% . First, a 100 nm MgF₂ thin film is used as an antireflection layer (ARL) of the top sub cell to improve the total PCE of the reference structure. The total PCE has increased by 7.12%. Finally, a new structure hole transport layer made of CuSCN nanowire arrays in the bottom sub cell is applied. By comparing two different cross sections for CuSCN nanowire arrays, the total PCE of the circular-cross section CuSCN nanowire arrays is incresed 0.52% compared to square-cross section CuSCN nanowire arrays. Therefore, a free-pb 4T APTSC with circular-cross section CuSCN nanowire arrays as hole transport layer is the best based on the total PCE, which reached 29.21%. This is 10.56% higher than the reference structure’s total PCE.