Here, the modification of the SnO2 electron transport layer (ETL) by tetramethylammonium chloride (TMACl) is described. The theoretical and experimental studies in this work demonstrate that TMA and Cl ions complementarily passivate the oxygen vacancies on the surface of SnO2 ETL, while TMACl passivation also contributes to increase the conduction band edge of SnO2 by reducing the work function. As a result, the charge carrier recombination and electron transfer/extraction behaviors at the interface of CsPbI2Br and SnO2 ETL are significantly improved, leading to inorganic perovskite solar cells with efficiencies of up to 13.84% and 28.68% under 1-sun illumination and indoor lighting, respectively. TMACl-passivated SnO2 also boosts the operative stability of the device under humidity and thermal stress, which reveals the potential of TMACl as a promising passivation agent of SnO2 for high-performance perovskite optoelectronics.

The dynamic CsBr treatment on α-CsPbI3 significantly improves the power conversion efficiency, reproducibility, and stability of all-inorganic CsPbI3−xBrx perovskite solar cells.

Just over a decade, perovskite solar cells (PSCs) have been emerged as a next‐generation photovoltaic technology due to their skyrocketing power conversion efficiency (PCE), low cost, and easy manufacturing techniques compared to Si solar cells. Several methods and procedures have been developed to fabricate high‐quality perovskite films to improve the scalability and commercialize PSCs. Recently, several printing technologies such as blade‐coating, slot‐die coating, spray coating, flexographic printing, gravure printing, screen printing, and inkjet printing have been found to be very effective in controlling film formation and improving the PCE of over 21%. This review summarizes the intensive research efforts given for these printing techniques to scale up the perovskite films as well as the hole transport layer (HTL), the electron transport layer (ETL), and electrodes for PSCs. In the end, this review presents a description of the future research scope to overcome the challenges being faced in the printing techniques for the commercialization of PSCs.

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