Abstract
Low-dimensional lead halide materials have proved to be intrinsically stable semiconductor materials.However,the development of one-dimensional(1D)perovskites or perovskitoids with both robust water stability and high optoelectronic performance still faces significant challenges.Here,we report a new class of 1D(TzBIPY)Pb2X6(X=Cl,Br,I)perovskitoids featuring a π-conjugated diamine cation(TzBIPY=2,5-di(pyridin-4-yl)thiazolo[5,4-d]thiazole).The TzBIPY2+cation with delocalized electrons directly contributes to the electronic structure and hence reduces the band gap.Especially,the Br-based material exhibits enhanced carrier separation and transport capacity,benefiting from the improved electronic conjugation together with a type Ⅱ intramolecular heterojunction between conjugated organic cations and Pb-X octahedra.The(TzBIPY)Pb2Br6 photodetector exhibits an impressive photocurrent on/off ratio of 8.1 × 105,which is much superior to the previous three-dimensional(3D)perovskite bench-mark.Additionally,the π-conjugated cations serve as dense protective shields for vulnerable Pb-X inor-ganic lattice against being attacked by water,thus demonstrating exceptional stability even immersed in water for over 3000 h.
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