EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Perovskite solar cells (PSCs) have been intensively investigated in the past decade and their power conversion efficiency (PCE) is reaching that of commercial silicon solar cells. However, the commercialization of PSCs remains a challenge. Inkjet printing has an advantage in terms of mass fabrication of PSCs over the conventional spin-coating method. In this study, we developed the inkjet-printing processes for TiO2, SrTiO3(STO) and SnO2 electron transport layers (ETLs) used in PSCs. For nanoparticle inks, the selection of solvents for dispersing nanoparticles is found to be important and the co-solvent system is beneficial for the film formation of mesoporous TiO2 and STO ETLs. The mixed mesoporous STO/TiO2 ETLs are also printed and studied to overcome the low current density and severe hysteresis in STO based devices. Furthermore, the co-solvent system is used for inkjet printing of the SnO2 ETL. Compared to PSCs based on TiO2 and STO ETLs, the SnO2 based devices achieve an optimal efficiency of 17.37% with a low hysteresis. This work expands the selection range of inkjet-printed ETL materials for PSCs and paves the way for the scalable production of PSCs.