Universal passivation strategy to slot-die printed SnO2 for hysteresis-free efficient flexible perovskite solar module.
Tongle Bu, Jing Li, Fei Zheng, Weijian Chen, Xiaoming Wen, Zhiliang Ku, Yong Peng, Jie Zhong, Yi-Bing Cheng, Fuzhi Huang
Nature Communications | Published : 2018
Perovskite solar cells (PSCs) have reached an impressive efficiency over 23%. One of its promising characteristics is the low-cost solution printability, especially for flexible solar cells. However, printing large area uniform electron transport layers on rough and soft plastic substrates without hysteresis is still a great challenge. Herein, we demonstrate slot-die printed high quality tin oxide films for high efficiency flexible PSCs. The inherent hysteresis induced by the tin oxide layer is suppressed using a universal potassium interfacial passivation strategy regardless of fabricating methods. Results show that the potassium cations, not the anions, facilitate the growth of perovskite ..View full abstract