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Sunday, November 22, 2020

#452 Organic semiconductors: question comes back

With Organic Light Emitting Diodes (OLED) dominating displays’ market these days, it is somewhat surprising to see how little is known about the meaning of “O” in now broadly used acronym “OLED”. So, a very brief explanation.


The letter “O” refers to organic materials, i.e. materials comprised of carbon and hydrogen in seemingly endless combinations and configurations, which display semiconductor properties similar to their inorganic counterparts such as elemental silicon or germanium, and many compound materials.


Organic semiconductors are based on either small molecules (monomers) or polymers comprised of small molecules shaped into chains. In both cases weak van der Waals forces are responsible for the cohesion of resulting plastic-like solids. In terms of chemical composition, the most commonly used representative of small-molecule organic semiconductors is pentacene, C22H44. The common polymeric organic semiconductors are conjugated polymers, i.e. polymers composed of two linked compounds. Both single-molecule and polymer semiconductors are readily available commercially.


Despite inferior to inorganic semiconductors electronic and photonic properties, organic semiconductors are broadly used in the range of applications because unlike typical inorganic semiconductors they allow transparent, flexible and printable electronic and photonic devices and circuits.


To get more insights into inorganic and organic semiconductors you may want to check my book “Guide to Semiconductor Engineering”.

Posted by Jerzy Ruzyllo at 05:57 PM | Semiconductors | Link is a personal blog of Jerzy Ruzyllo. He is Distinguished Professor Emeritus in the Department of Electrical Engineering at Penn State University. With over forty years' experience in academic research and teaching in semiconductor engineering he has a unique perspective on the developments in this technical domain and enjoys blogging about it.

This book gives a complete account of semiconductor engineering covering semiconductor properties, semiconductor materials, semiconductor devices and their uses, process technology, fabrication processes, and semiconductor materials and process characterization.

With over 2000 terms defined and explained, Semiconductor Glossary is the most complete reference in the field of semiconductors on the market today.


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