Component Distribution Regulation in Sn-Pb Perovskite Solar Cells through Selective Molecular Interaction.

Tin-lead (Sn-Pb) perovskite solar cells (PSCs) with near ideal bandgap still lag behind the pure lead PSCs. Disordered heterojunctions caused by inhomogeneous Sn/Pb ratio in the binary perovskite film induce large recombination loss. Here, we report a Sn-Pb perovskite film with homogeneous component and energy distribution through introducing hydrazine sulfate (HS) in Sn perovskite precursor. HS could form hydrogen bond network and coordinate with FASnI 3 thus no longer bond with Pb 2+ , which reduces the crystallization rate of tin perovskite to the level of lead analogue. The strong bonding between SO 4 2- and Sn 2+ could also suppress its oxidation. As a result, the Sn-Pb PSCs with HS exhibit a significantly improved V OC of 0.91 V along with a high efficiency of 23.17%. Meanwhile, the hydrogen bond interaction network, strong bonding between Sn 2+ and sulfate ion also improve the thermal, storage and air stability of resulting devices. This article is protected by copyright. All rights reserved.