Molecular Engineering of Phenothiazine-Based Monomer and Dimer Hole Transport Materials and Their Photovoltaic Performance

Abstract Through molecular engineering, phenothiazine-based monomer hole transport material (HTM) PTZT and dimer HTM D-PTZT were designed and synthesized. The photoelectrochemical properties are significantly influence by the adjustment of the molecular structure. Applied in perovskite solar cells (PSCs), monomer HTM PTZT-based device achieves the highest efficiency of 18.74% while only 15.45% for dimer HTM D-PTZT-based device under 100 mW cm–2 AM 1.5G solar illumination.