Abstract
The 3,7-substituents exhibit enhanced conjugation and better hole extraction ability, leading to better performance in perovskite solar cells compared with other HTMs. 4,6-substituents exhibit inferior device performance due to the broken conjugation of 4,6-position and bad film-forming ability. The heteroatom exhibits different effect when the side arm located different position on the bridges. All the devices with developed molecules exhibit better stability than spiro-OMeTAD because no dopants are used.
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