Understanding the role of interconnecting layer on determining monolithic perovskite/organic tandem device carrier recombination properties

作者：Xie, Yue-Min^*; Niu, Tianqi; Yao, Qin; Xue, Qifan^*; Zeng, Zixin; Cheng, Yuanhang; Yip, Hin-Lap^*; Cao, Yong

来源：Journal of Energy Chemistry, 2022, 71: 12-19.

DOI：10.1016/j.jechem.2022.03.019

• Monolithic perovskite
• organic tandem solar
• cells
• Interconnecting layers (ICLs)
• Carrier modulating
• Carrier balance properties

As one of the core parts of two-terminal (2T) monolithic tandem photovoltaics, the interconnecting layers (ICLs) play a critical role in modulating the carrier transport and recombination between the sub-cells, and thus influencing the tandem device performance. Here, for the first time, the relationship between ICLs architecture and 2T monolithic perovskite/organic tandem device performance has been studied by investigating the change of ICLs composition layer thickness on the ICLs optical and electrical proper-ties, sub-cells EQE properties, and tandem device J-V properties. It is revealed that the ability of ICLs on modulating the sub-cells carrier balance properties is strongly associated with its composited layers thickness, and the tandem device carrier balance properties can be reflected by the relative EQE intensity between the sub-cells. Finally, with a deep understanding of the mechanisms, rational design of ICLs can be made to benefit the tandem device development. Based on the optimized ICL a high PCE of 20.03% is achieved.