首页|Conjugated diamine cation based halide perovskitoid enables robust stability and high photodetector performance
Conjugated diamine cation based halide perovskitoid enables robust stability and high photodetector performance
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Conjugated diamine cation based halide perovskitoid enables robust stability and high photodetector performance
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.
Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education,Lehn Institute of Functional Materials,Guangdong Basic Research Center of Excellence for Functional Molecular Engineering,School of Chemistry,Institute of Green Chemistry and Molecular Engineering,Sun Yat-Sen University,Guangzhou 510275,China
State Key Laboratory of Optoelectronic Materials and Technologies,Sun Yat-Sen University,Guangzhou 510275,China
Instrumental Analysis and Research Center,Sun Yat-Sen University,Guangzhou 510275,China
Conjugated organic cation Lead halide material Intramolecular heterojunction Efficient carrier separation Photodetector
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