Efficiently Improving the Stability of Inverted Perovskite Solar Cells by Employing Polyethylenimine-Modified Carbon Nanotubes as Electrodes

• DOI: 10.1021/acsami.8b10253
• Publication Date: 2018-08-20T20:21:22Z
• Authors: Yu Zhou; Xuewen Yin; Qiang Luo; Xingyue Zhao; Duanliang Zhou; Jianhua Han; Feng Hao; Meiqian Tai; Jianbao Li; Peng Liu; Kaili Jiang; Hong Lin
• Keywords: Polyethylenimine; Carbon fibers

Inverted perovskite solar cells (PSCs) have been becoming more and attractive, owing to their easy-fabrication suppressed hysteresis, while the ion diffusion between metallic electrode layer limit long-term stability of devices. In this work, we employed a novel polyethylenimine (PEI) modified cross-stacked superaligned carbon nanotube (CSCNT) film in inverted planar PSCs configurated FTO/NiO x/methylammonium lead tri-iodide (MAPbI3)/6, 6-phenyl C61-butyric acid methyl ester (PCBM)/CSCNT:PEI. By modifying CSCNT with certain concentration PEI (0.5 wt %), suitable energy level alignment promoted interfacial charge transfer achieved, leading significant enhancement photovoltaic performance. As result, champion power conversion efficiency (PCE) ∼11% was obtained Voc 0.95 V, Jsc 18.7 mA cm-2, FF 0.61 as well negligible hysteresis. Moreover, CSCNT:PEI based show superior durability comparison standard silver devices, remaining over 85% initial PCE after 500 h aging under various conditions, including air exposure, thermal, humid treatment. This work opens up new avenue facile electrodes for highly stable hysteresis PSCs.