High Effiency Perovskites and Perovskite Tandems via Passivation and Charge Transport Engineering

Combining perovskites with well-established photovoltaic materials such as silicon is an attractive approach for producing cheap, high efficiency and high voltage solar cells. Perovskite/silicon tandems have the potential for further progress in increasing the efficiency to 30% and beyond provided high efficiency perovskite cells can be demonstrated. We demonstrate a 4-terminal tandem perovskite/silicon configuration in which the efficiency is as high as 27.7% through a passivation approach using 2D perovskites. We also demonstrate efficiency above 22% and fill factor of 86% for a 1cm2 single junction perovskite cell using a titanium oxynitride electrode transport layer. We also discuss how high efficiency can contribute to lowering the cost of photovoltaics and to decarbonization, as well as some emerging research challenges as solar transitions to become one of the world’s major energy technologies.