Chiral 3D Perovskite Formation Induced by Chiral Templates

Chiral 3D perovskites pose challenges compared to lower-dimensional
variants due to limited chiral organic cation options. Here, we present
a universal and controlled method for synthesizing chiral 3D lead
halide perovskites using organic amines or alcohols as chiral templates.
Introducing these templates to PbCl2 in N,N-dimethylformamide (DMF) under acidic conditions
induces the crystallization of R/S [DMA]PbCl3 (DMA = dimethylamine).
The resulting structure aligns with the templates used, stemming from
the helical Pb2Cl95– chain
as verified by single-crystal X-ray diffraction. Furthermore, the
chiral perovskite exhibits absorption and circular dichroism (CD)
signals in the high-energy band, enabling the circularly polarized
light (CPL) detection in the UV spectrum. A CPL detector constructed
by this chiral perovskite demonstrates excellent performance, boasting
an anisotropy factor for photocurrent (gIph) of 0.296. Our work not only introduces a novel and controllable
method for crafting chiral perovskites but also opens new avenues
for circularly polarized light detection.