Step-saving synthesis of star-shaped hole-transporting materials with carbazole or phenothiazine cores via optimized C–H/C–Br coupling reactions |
| |
| Authors: | Jui-Heng Chen Kun-Mu Lee Chang-Chieh Ting Ching-Yuan Liu |
| |
| Affiliation: | Department of Chemical and Materials Engineering, National Central University, Jhongli District, Taoyuan 320 Taiwan Republic of China.; Department of Chemical and Materials Engineering, Chang Gung University, Department of Pediatrics, Chang Gung Memorial Hospital, Linkou, Taoyuan 333 Taiwan Republic of China, |
| |
| Abstract: | In most research papers, synthesis of organic hole-transporting materials relies on a key-reaction: Stille cross-couplings. This requires tedious prefunctionalizations including the preparation and treatment of unstable organolithium and toxicity-concern organotin reagents. In contrast to traditional multistep synthesis, this work describes that a series of star-shaped small molecules with a carbazole or phenothiazine core can be efficiently synthesized through a shortcut using optimized direct C–H/C–Br cross-couplings as the key step, thus avoiding dealing with the highly reactive organolithium or the toxic organotin species. Device fabrication of perovskite solar cells employing these molecules (6–13) as hole-transporting layers exhibit promising power conversion efficiencies of up to 17.57%.Carbazole or phenothiazine core-based hole-transport materials are facilely accessed by an optimized synthesis-shortcut. Perovskite solar cell devices with 6–13 demonstrate PCEs of up to 17.57%. |
| |
| Keywords: | |
|
|
