Diamine-Templated Crystal Growth of Perovskite Films for Record p-i-n Perovskite Solar Cells

Energy loss of perovskite/ETL interface is the limiting factor for pin perovskite solar cells, various methods are explored to address this issue, for example, post-treatment with organic salts are normally used to get more n-type surface, so as to gain good energy alignment between perovskite and ETL. Here, by using a diamine molecule in the bottom surface to template the crystal growth of perovskite film, we get highly oriented perovskite films with more n-type characters, after combining with the 2D passivation, the energy loss was reduced effectively, based on this, we get above 26% PCE for pin perovskite solar cells in the lab, and 25.75% PCE from fast scan and 24.9 % QSS PCE (Certified in Nrel), which are the record efficiencies for pin PSCs, and 1 cm2 devices also shows 23.8 % PCE, except for the record PCE, the devices also show great operational stability, after 1000 illumination, the device shows no degradation.