Designing new fullerene derivatives as electron transporting materials for efficient perovskite solar cells with improved moisture resistance. (December 2016)

• Record Type: Journal Article
• Authors: Meng, Xiangyue; Bai, Yang; Xiao, Shuang; Zhang, Teng; Hu, Chen; Yang, Yinglong; Zheng, Xiaoli; Yang, Shihe
• Is Part Of: Nano energy. Volume 30(2016:Dec.)
• Page Start: 341
• Page End: 346
• Publication Date: 2016-12
• Subjects: Perovskite solar cells -- Fullerene derivatives -- Electron transporting materials -- Open circuit voltage -- Energy level; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.10.026
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: A new fullerene derivative named C5-NCMA is introduced as an electron transporting material (ETM) to replace the commonly used PCBM in the planar p-i-n perovskite solar cells (PVSCs). Compared with PCBM, this fullerene derivative features a higher hydrophobicity, higher LUMO energy level and higher ability of self-assembly. With the device structure of FTO/NiOx /MAPbI3 /ETM/Ag, the C5-NCMA showed power conversion efficiency (PCE) of up to 17.6% with negligible hysteresis, which is higher than PCBM (16.1%). It was found that a higher LUMO energy level was obtained for C5-NCMA compared to PCBM, which favored a higher open-circuit voltage ( V oc ) in PVSCs with C5-NCMA than PCBM. Besides, the higher electron mobility, photoluminescence (PL) quenching efficiency and quenching rate of C5-NCMA led to more efficient electron transport and charge extraction in the device, thus resulting in a higher fill factor (0.79). Most importantly, the stability of PVSCs to moisture is significantly enhanced for C5-NCMA compared to PCBM due to the hydrophobic nature of C5-NCMA. Thus, we believe that the present work provides an important guide for the further development of ETMs for stable and efficient PVSCs. Graphical abstract: Highlights: A new fullerene derivative (C5-NCMA) is introduced as (ETM for) planar p-i-n (PVSCs). C5-NCMA features a higher LUMO energy level and higher ability of self-assembly. Power conversion efficiency of 17.6% was achieved. The stability of (PVSCs) to moisture is enhanced due to the hydrophobic C5-NCMA.