Lead-Free Chiral Perovskite for High Degree of Circularly Polarized Light Emission and Spin Injection.
basic_science · Level V
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- Record sourced from PubMed, PMID 38198561.
- Also identified by DOI 10.1021/acs.nanolett.3c04575.
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Abstract
We report a zero-dimensional (0D) lead-free chiral perovskite (S-/R-MBA)<sub>4</sub>Bi<sub>2</sub>I<sub>10</sub> with a high degree of circularly polarized light (CPL) emission. Our 0D lead-free chiral perovskite exhibits an average degree of circular polarization (DOCP) of 19.8% at 78 K under linearly polarized laser excitation, and the maximum DOCP can reach 25.8%, which is 40 times higher than the highest DOCP of 0.5% in all reported lead-free chiral perovskites to the best of our knowledge. The high DOCP of (S-/R-MBA)<sub>4</sub>Bi<sub>2</sub>I<sub>10</sub> is attributed to the free exciton emission with a Huang-Rhys factor of 2.8. In contrast, all the lead-free chiral perovskites in prior reports are dominant by self-trapped exciton in which the spin relaxation reduces DOCP dramatically. Moreover, we realize the manipulation of the valley degree of freedom of monolayer WSe<sub>2</sub> by using the spin injection of the 0D chiral lead-free perovskites. Our results provide a new perspective to develop lead-free chiral perovskite devices for CPL light source, spintronics, and valleytronics.