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Related Concept Videos

Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chiral All-Inorganic Perovskite Subnanowires.

Gaoyu Chen1,2, Kunhong Zhou1, Qingda Liu3

  • 1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China.

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|March 27, 2025
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Researchers created chiral 3D perovskite subnanowires using chiral amines. These materials enable efficient circularly polarized light detectors and spin-LEDs, advancing optoelectronics.

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Area of Science:

  • Materials Science
  • Crystallography
  • Optoelectronics

Background:

  • Chiral symmetry breaking in achiral crystallization is challenging, especially for 3D chiral perovskites with achiral space groups.
  • Developing controllable methods for enantiomerically pure crystal formation is crucial for advanced materials.

Purpose of the Study:

  • To synthesize right- or left-handed (P/M) chiral 3D perovskite subnanowires (SNWs) of CsPbX3.
  • To achieve selective control over SNW handedness using chiral amines and investigate the formation mechanism.
  • To explore applications in circularly polarized light (CPL) photodetectors and spin light-emitting diodes (spin-LEDs).

Main Methods:

  • Synthesis of 3D P/M-CsPbX3 perovskite subnanowires (SNWs) with potential heteroion substitution (Cu(II), Sn(II), Mn(II)).
  • Selective control of SNW handedness via trace chiral amine enantiomers.
  • Investigation of chiral structure formation using a thermodynamic model.
  • Fabrication and testing of CPL photodetectors and spin-LEDs.

Main Results:

  • Successfully synthesized P/M chiral 3D CsPbX3 perovskite SNWs with controllable handedness.
  • Demonstrated chiroptical activity arising from the helical SNW structure.
  • Achieved a high photocurrent dissymmetry factor (gIph) of 0.75 in CPL photodetectors.
  • Enabled circularly polarized electroluminescence (CPEL) in spin-LEDs using SNWs for chiral-induced spin selectivity (CISS) and CPL emission.

Conclusions:

  • The study presents a viable method for creating 3D chiral perovskite SNWs with tunable handedness.
  • These chiral perovskites show significant potential for advanced optoelectronic devices, including CPL detectors and spin-LEDs.
  • The findings contribute to understanding chiral structure formation and its application in spintronics and photonics.