Robust Nonspiro‐Based Hole Conductors for High‐Efficiency Perovskite Solar Cells

Despite considerable development in performance, both poor operational stability and high costs associated with hole conductors such as 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) Poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA) of perovskite solar cells (PSCs) need to be addressed by the research community. Here, two nonspiro transporting materials (HTMs), namely HTM-1 HTM-2, are designed straightforwardly synthesized exhibiting remarkable electrochemical properties mobilities. In particular, PSC based on methoxy derivative (HTM-2) exhibits a efficiency 21.2% (stabilized 20.8%), which is superior benchmark HTM spiro-OMeTAD 20.4%). These results establish that molecular design effective improving performance PSCs. Importantly, these HTMs show admissible long-term under different harsh conditions thermal stress up 85 °C, humidity level 60% ± 10%, continuous illumination over 1000 h. insights allow correlating impact optoelectronic nonspiro-based overall device performance.