Abstract
The synthesis and characterization of two related families of star-shaped thiophene-containing hole-transporting materials (HTMs) based on fused tetrathienoanthracene and nonfused tetrathienylbenzene cores are reported. All of them are endowed with four terminal (4,4'-dimethoxy) diphenylamino groups that are either linked directly to the core or showed a different type of bridges (i.e., thiophene-phenyl or phenyl rings). The novel HTMs are tested in mixedion perovskite (Cs(0.1)FA(0.74)MA(0.13)PbI(2.48)Br(0.39)) solar cells, and power conversion efficiencies of up to 18.8% are measured under 1 sun irradiation, comparable with the efficiency obtained for the reference cell using 2,2', 7,7'-tetrakis(N,N'di- p-methoxyphenylamine)-9,9'-spirobifluorene as an HTM.