Optical management for back-contact perovskite solar cells with diverse structure designs

Interdigitated back-contact (IBC) structure design is a promising alternative to further promote the optical ab-sorption and the power conversion efficiency of perovskite solar cells (PSCs). However, their full potential has not been reached owing to the absence of the advanced structure designs and a lack of a deep understanding on the related physics mechanism. In this paper, we proposed three typical IBC configurations featuring flat perovskite layer, textured electron transport layer (ETL) and hole transport layer (HTL), and textured HTL but flat ETL. By the numerical simulations, the optical properties of the three related designs are investigated sys-tematically. The simulation results reveal that anti-reflection coating (ARC) thickness plays an important in determining the device performance and the optimal ARC thickness is suggested to be 70-80 nm. The optimal structure sizes are confirmed by optimizing the structure parameters. In addition, the light-trapping mechanism is clarified by the position-determined photocurrent density and the spatial electric field distributions. Moreover, dependence of optical response under the various perovskite thickness is checked, suggesting that textured IBC structure design is good to achieve high optical absorption. The simulation results demonstrated in this paper provide a valuable guide to design IBC PSCs with high optical performance.

Automated summary

In this paper, three typical interdigitated back-contact (IBC) configurations were proposed and the optical properties of these designs were systematically investigated through numerical simulations. The results showed that the thickness of the anti-reflection coating (ARC) played a crucial role in determining the device performance, with an optimal thickness of 70-80 nm. The light-trapping mechanism was also clarified by analyzing the position-determined photocurrent density and spatial electric field distributions, confirming the effectiveness of textured IBC structure design in achieving high optical absorption.