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Molecular Shapes

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...

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Bridging the Bio-Electronic Interface with Biofabrication

Bridging the Bio-Electronic Interface with Biofabrication

Published on: June 6, 2012

Molecular Electronics: From Nanostructure Assembly to Device Integration.

Meng Yuan^1,2, Yuchen Qiu³, Hanfei Gao⁴

¹Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

Journal of the American Chemical Society

|March 14, 2024

Summary

Achieving high-performance organic electronics requires advanced assembly strategies for precise molecular patterning. This review details a roadmap for organic integration technologies, focusing on long-range order and orientation control for defect-free devices.

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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Area of Science:

Materials Science
Organic Electronics
Nanotechnology

Background:

Organic semiconductors offer tunable properties, solution processability, and flexibility, driving interest in integrated electronics and optoelectronics for displays, photovoltaics, and biosensing.
Miniaturization and integration trends necessitate scalable assembly strategies for high-resolution organic micro/nano-structures with long-range order and pure orientation.
Current integration methods for molecular electronics face challenges due to weak intermolecular interactions, leading to defects and disorders.

Purpose of the Study:

To provide a comprehensive roadmap of organic integration technologies over the past three decades.
To highlight the critical role of long-range-ordered molecular packing in achieving superior electronic and photophysical properties.
To classify and evaluate large-scale integration strategies based on resolution, crystallinity, orientation, scalability, and versatility.

Main Methods:

Reviewing historical development of molecular electronics integration techniques.
Classifying assembly strategies by controlling nucleation and crystallographic orientation.
Evaluating methods based on key performance metrics: resolution, crystallinity, orientation, scalability, and versatility.

Main Results:

Emphasis on the importance of molecular packing for advanced electronic and photophysical properties.
Classification and comparative evaluation of various organic integration strategies.
Discussion of multifunctional devices and integrated circuits, including organic field-effect transistors (OFETs) and photodetectors.

Conclusions:

Future research should focus on assembly of doped organic semiconductors, heterostructures, and biological interfaces.
Development of integrated organic logics based on complementary field-effect transistors (FETs) is a key future direction.
Continued advancement in versatile assembly platforms is crucial for overcoming defects and disorders in organic electronics.