1 research outputs found
Synthesis and Optical Properties of One Year Air-Stable Chiral Sb(III) Halide Semiconductors
Chiral hybrid metal-halide semiconductors (MHS) pose
as ideal candidates
for spintronic applications owing to their strong spin–orbit
coupling (SOC), and long spin relaxation times. Shedding light on
the underlying structure–property relationships is of paramount
importance for the targeted synthesis of materials with an optimum
performance. Herein, we report the synthesis and optical properties
of 1D chiral (R-/S-THBTD)SbBr5 (THBTD = 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine) semiconductors
using a multifunctional ligand as a countercation and a structure
directing agent. (R-/S-THBTD)SbBr5 feature direct and indirect band gap characteristics, exhibiting
photoluminescence (PL) light emission at RT that is accompanied by
a lifetime of a few ns. Circular dichroism (CD), second harmonic generation
(SHG), and piezoresponse force microscopy (PFM) studies validate the
chiral nature of the synthesized materials. Density functional theory
(DFT) calculations revealed a Rashba/Dresselhaus (R/D) spin splitting,
supported by an energy splitting (ER)
of 23 and 25 meV, and a Rashba parameter (αR) of
0.23 and 0.32 eV·Å for the R and S analogs, respectively. These values are comparable to
those of the 3D and 2D perovskite materials. Notably, (S-THBTD)SbBr5 has been air-stable for a year, a record
performance among chiral lead-free MHS. This work demonstrates that
low-dimensional, lead-free, chiral semiconductors with exceptional
air stability can be acquired, without compromising spin splitting
and manipulation performance