Balancing Charge-Carrier Transport and Recombination for Perovskite/TOPCon Tandem Solar Cells with Double-Textured Structures

摘要

The ongoing success of tunnel oxide passivating contact (TOPCon) solarcells in the photovoltaic community in conjunction with the continuousadvancements in the fabrication technologies of perovskite-based tandemdevices make it possible to access highly-efficient perovskite/TOPContandem solar cells (TSCs). However, the development of such tandem solarcells is still in its infancy. One of the main challenges facing these devicesis the balance of passivation and contact properties, especially on thetextured crystalline silicon substrates. This article focuses on the doubletexturedTOPCon structures, and systematically investigates their passivationand contact properties with the purpose of balancing charge-carrierrecombination and transport properties. The experiment results showthat passivation and contact properties of the double-textured TOPConstructures can be well-regulated by means of rearranging the schedulesof annealing processes and radio frequency powers of SiO_x deposition.The mechanisms of charge-carrier transport on the textured structures areclosely studied, suggesting that charge carriers prefer to transport via thevalleys of pyramids where the SiO_x layer is thin or missing. As a result, theproof-of-concept perovskite/TOPCon TSCs featuring the double-texturedstructures are successfully fabricated with a remarkable efficiency of28.49%.