PUB - Publikationen an der Universität Bielefeld

In recent years, SnO₂quantum dots (QDs) have been widely used for preparing the electron transport layer (ETL) within perovskite solar cells (PSCs). However, the fabricated devices exhibit an evident hysteresis unless interlayer materials are introduced to passivate or prevent the formation of trap states at the SnO₂‐perovskite interface. Herein, we propose the use of the zwitterion 3‐(1‐pyridinio)‐1‐propanesulfonate (PPS) as additive inside the SnO₂quantum dots solution. Our results highlight that the PPS plays a multifunctional role by accelerating the synthesis of the QDs, enhancing the electron transfer and passivating defects at the SnO₂‐perovskite interface. The resulting PSCs with SnO₂QDs incorporating PPS exhibit a remarkable reduction in hysteresis index (HI) compared to those prepared with thiourea or without any additives. This reduction in HI suggests that PPS serves as a cost‐effective alternative additive for SnO₂QDs preparation, eliminating the need for additional interlayers or expensive additives. This article is protected by copyright. All rights reserved.