Tailoring the Time-Averaged Structure for Polarization-Sensitive Chiral Perovskites

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Chiral perovskites are explored for polarization-sensing applications due to their chiroptical properties.
• Challenges remain in understanding their multiple-quantum-well structures and the origin of chiroptical activity, hindering polarization-based and spintronic applications.
• Simultaneous enhancement of chiroptical activity and charge transport in chiral perovskites is an underexplored area.

Purpose of the Study:

• To investigate the effect of Lewis base incorporation on the chiroptical and electrical properties of chiral perovskites.
• To elucidate the mechanism behind material property manipulation induced by Lewis bases.
• To demonstrate a proof-of-concept device utilizing these modified chiral perovskites.

Main Methods:

• Incorporation of Lewis bases into the chiral perovskite lattice.
• Solid-state nuclear magnetic resonance (ssNMR) spectroscopy.
• Theoretical calculations.
• Fabrication and characterization of a vertical-type circularly polarized light photodetector.

Main Results:

• Lewis base incorporation effectively tuned the chiroptical response and electrical properties of chiral perovskites.
• ssNMR and theoretical calculations revealed that Lewis bases alter the time-averaged structure, leading to property changes.
• A vertical-type photodetector demonstrated high performance with a distinguishability of 0.27 and responsivity of 0.43 A W^-1.

Conclusions:

• Lewis base incorporation offers a viable strategy to tune the properties of chiral perovskites.
• Understanding the structural modifications induced by Lewis bases is key to optimizing chiral perovskite performance.
• The developed photodetector showcases the potential of Lewis base-modified chiral perovskites in polarization-sensing and optoelectronic applications.