Graphene-Templated Achiral Hybrid Perovskite for Circularly Polarized Light Sensing.
ACS Appl Mater Interfaces
; 16(39): 52789-52798, 2024 Oct 02.
Article
em En
| MEDLINE
| ID: mdl-39297304
ABSTRACT
This study points out the importance of the templating effect in hybrid organic-inorganic perovskite semiconductors grown on graphene. By combining two achiral materials, we report the formation of a chiral composite heterostructure with electronic band splitting. The effect is observed through circularly polarized light emission and detection in a graphene/α-CH(NH2)2PbI3 perovskite composite, at ambient temperature and without a magnetic field. We exploit the spin-charge conversion by introducing an unbalanced spin population through polarized light that gives rise to a spin photoconductive effect rationalized by Rashba-type coupling. The prepared composite heterostructure exhibits a circularly polarized photoluminescence anisotropy gCPL of â¼0.35 at â¼2.54 × 103 W cm-2 confocal power density of 532 nm excitation. A carefully engineered interface between the graphene and the perovskite thin film enhances the Rashba field and generates the built-in electric field responsible for photocurrent, yielding a photoresponsivity of â¼105 A W-1 under â¼0.08 µW cm-2 fluence of visible light photons. The maximum photocurrent anisotropy factor gph is â¼0.51 under â¼0.16 µW cm-2 irradiance. The work sheds light on the photophysical properties of graphene/perovskite composite heterostructures, finding them to be a promising candidate for developing miniaturized spin-photonic devices.
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MEDLINE
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En
Ano de publicação:
2024
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Article