Chlorine Management Of A Carbon Counter Electrode For High Performance Printable Perovskite Solar Cells

The printable HTM-free (HTM = hole transport materials) mesoporous carbon-based perovskite solar cells (C-PSCs) are one of the most promising technologies because of their simple production process, lost-cost and excellent stability. In this study, a novel and secure method is used to modify the original graphite, and the obtained chlorinated graphites (C-Cl-x, x = 0.2, 0.4, and 0.6) are applied to counter electrodes (CEs) in the printing of C-PSCs based on the TiO2/ZrO2/(5-AVA)(x)(MA)(1-x)PbI3/C-Cl-x structure. The experimental results show that C-Cl-x (x = 0.2, 0.4, and 0.6) can effectively improve the efficiency of C-PSCs. The mesoporous PSCs based on C-Cl-0.4 CE have achieved an average efficiency of 11.81%, which is about 1.46-times of the pristine device with carbon CE, and the short-circuit current density (J(sc)), fill factor (FF) and open-circuit voltage (V-oc) increased by 15.8%, 11.7% and 11.2%, respectively. Simultaneously, a 30 day aging test showed that PSCs based on (5-AVA)(x)(MA)(1-x)PbI3 and C-Cl-x CEs showed excellent stability under ambient air conditions.