Alcohol-dispersed polymer complex as an effective and durable interface modifier for n-i-p perovskite solar cells

• Published in: Journal of energy chemistry 2024-06, Vol.93, p.243-252
• Main Authors: Shi, Chang, Li, Jiangling, Xiao, Shuping, Wang, Ziyi, Xiang, Wuchen, Wu, Rui, Liu, Yang, Zhou, Yinhua, Ke, Weijun, Fang, Guojia, Qin, Pingli
• Format: Article
• Language: English
• Subjects: Alcohol-dispersed conducting polymer complex; Device stability; Grain boundaries; Interface passivation; Perovskite solar cells
• ISSN: 2095-4956
• DOI: 10.1016/j.jechem.2024.01.075

PEDOT:F reacts with the organic groups to induce structural transformation in PEDOT, thereby facilitating coupling with Pb2+ for superior defect passivation. Consequently, the perovskite solar cells achieve an efficiency of 24.81% with enhanced stability. [Display omitted] Abundant interfacial defects remain a significant challenge that hampers both the efficiency and stability of perovskite solar cells (PSCs). Herein, an alcohol-dispersed conducting polymer complex, denoted as PEDOT:F (Poly (3,4-ethylene dioxythiophene):Perfluorinated sulfonic acid ionomers), is introduced into the interface between perovskite and hole transporting layer in regular-structured PSCs. PEDOT:F serves as a multi-functional interface layer (filling grain boundaries and covering perovskite’s grain-surface) to achieve a robust interaction with organic groups within perovskites, which could induce a structural transformation of PEDOT to increase its conductivity for the efficient hole-transport. Furthermore, the strong interaction between PEDOT and perovskites could promote an effective coupling of undercoordinated Pb2+ ions with the lone electron pairs near O & S atoms in PEDOT molecules, thereby enhancing defect passivation. Additionally, PEDOT:F with inherent hydrophobic properties prevents effectively moisture invasion into perovskites for the improved long-term stability of the PSCs. Consequently, the PEDOT:F-based PSCs achieved a champion efficiency of 24.81%, and maintained ca. 92% of their initial efficiency after 7680 h of storage in a dry air environment, accompanied by the enhanced photothermal stability.