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Semiconductors01:22

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality02:25

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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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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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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Chirality amplification in semiconductors for advanced optoelectronics.

Jaeyong Ahn1,2, Wonbin Choi1, Sang Hyuk Lee1

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Chiral semiconductors can absorb or emit circularly polarized light (CPL), enabling advanced optoelectronics. This review highlights strategies to enhance their weak chiroptical activity for high-performance spin-based optical devices.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Circularly polarized light (CPL) offers spin-selective information crucial for advanced optical devices.
  • Intrinsically chiral semiconductors are promising for CPL absorption/emission but suffer from weak chiroptical activity.
  • Enhancing chiroptical performance is key for practical applications in chiral optoelectronics.

Purpose of the Study:

  • To review recent advancements in chirality amplification strategies for semiconductors in optoelectronics.
  • To classify intrinsically chiral semiconductors and discuss their roles in CPL interactions.
  • To explore methods for boosting chiroptical signal output in chiral optoelectronic devices.

Main Methods:

  • Classification of intrinsically chiral semiconductors into organic, metal-organic, and chiral hybrid perovskites.
  • Review of molecular design, processing techniques, and device engineering strategies.
  • Discussion of theoretical frameworks supporting chiroptical signal enhancement.

Main Results:

  • Significant improvements in the chiroptical properties of chiral semiconductors have been achieved.
  • Various strategies effectively enhance light-matter interactions for CPL.
  • The review categorizes materials and methods for chirality amplification.

Conclusions:

  • Recent progress lays the groundwork for high-performance chiral optoelectronic devices.
  • Advanced molecular design and device engineering are crucial for enhancing chiroptical activity.
  • These developments pave the way for innovations in spin-based photonic technologies.