One-Step Facile Synthesis of a Simple Hole Transport Material for Efficient Perovskite Solar Cells

Abstract

A study was conducted to report a new, simple, hole transport material (HTM) composed of a central difluorinated phenyl ring, tetra-substituted with paramethoxydiarylamine groups (DFTAB). Devices fabricated using DFTAB demonstrated a stabilized PCE, had a higher energy absorption cutoff than devices utilizing the ubiquitous spiro-OMeTAD, and offered the potential to be used without the addition of ionic additives. The synthesis of DFTAB was carried out in a one pot reaction where 4,4'-dimethoxydiphenylamine was first deprotonated by NaH, followed by nucleophilic aromatic substitution of hexafluorobenzene with in situ generated amide sodium salt. The thermal properties were investigated by thermogravimetric analysis (TGA) .