Deuterated perovskite for room temperature spin device

Area of Science:

• Materials Science
• Condensed Matter Physics
• Organic-Inorganic Hybrid Perovskites

Background:

• Organic-inorganic hybrid perovskites (OIHPs) possess desirable properties for spintronics, including strong spin-orbit coupling and high carrier mobility.
• Rapid spin relaxation, often attributed to the inorganic sublattice, has limited their spintronic potential.
• Understanding and mitigating spin relaxation mechanisms in OIHPs is crucial for device applications.

Purpose of the Study:

• To investigate the impact of isotope engineering on spin relaxation and transport in hybrid perovskites.
• To demonstrate room-temperature spin transport and explore spintronic functionalities in deuterium-substituted methylammonium lead iodide.
• To establish isotope engineering as a viable strategy for enhancing spin properties in hybrid materials.

Main Methods:

• Deuterium substitution for hydrogen in methylammonium lead iodide (CH₃NH₃PbI₃ to CD₃ND₃PbI₃).
• Measurement of spin lifetime and magnetocurrent (MC) response at room temperature.
• Investigation of spin photovoltaic effect under ambient conditions.

Main Results:

• Deuterium substitution significantly suppressed hyperfine interactions (HFI), increasing spin lifetime by 2.6-fold.
• CD₃ND₃PbI₃ exhibited a substantial room-temperature magnetocurrent (MC) ratio of 17.5%, unlike conventional CH₃NH₃PbI₃.
• A spin photovoltaic effect was observed, demonstrating coupling between optical excitation and spin-polarized transport.

Conclusions:

• Isotope engineering, specifically deuterium substitution, effectively suppresses spin relaxation in hybrid perovskites.
• This approach enables robust room-temperature spin transport and magnetocurrent in OIHPs.
• The findings open new avenues for light-addressable spintronic devices and revise the understanding of spin dynamics in these materials.