Li-TFSI free carbazole-based hole transport materials enable highly stable perovskite solar cells†
Abstract
It is crucial to fabricate highly stable perovskite solar cells for further commercialization. Herein, a novel cationic salt OY(TFSI)2 as an effective p-dopant to replace Li-TFSI is synthesized and introduced into the hole transport layer to improve the long-term stability of the device.