Some organic food for thought! Organic semiconductors anyone?
"... A team ... has now taken a step towards this goal by constructing an organic bipolar junction transistor from highly ordered (crystalline) thin films of an organic semiconductor called rubrene. This material has a high charge mobility, meaning that charge carriers move through it extremely fast and over long distances. ...
... had previously made both p- and n-type rubrene films, but in the latest work, it took the additional step of engineering these films on a very thin crystalline rubrene layer around 20 nm thick. The films then act a seed for subsequent p- and n- layers as well as layers that are i-type – that is, they are neither n- or p- and thus carry neither negative nor positive charge carriers. ...
the new device with about 400 MHz/V is almost a hundred times faster than previous organic transistors ..."
... had previously made both p- and n-type rubrene films, but in the latest work, it took the additional step of engineering these films on a very thin crystalline rubrene layer around 20 nm thick. The films then act a seed for subsequent p- and n- layers as well as layers that are i-type – that is, they are neither n- or p- and thus carry neither negative nor positive charge carriers. ...
the new device with about 400 MHz/V is almost a hundred times faster than previous organic transistors ..."
"... Organic field-effect transistors (FET) were first reported in 1986 and have shown impressive improvements in the past two decades ..."
From the abstract:
"... Among materials systems suitable for thin-film electronics, organic semiconductors are of particular interest; their low cost, biocompatible carbon-based materials and deposition by simple techniques such as evaporation or printing enable organic semiconductor devices to be used for ubiquitous electronics, such as those used on or in the human body or on clothing and packages. The potential of organic electronics can be leveraged only if the performance of organic transistors is improved markedly. Here we present organic bipolar transistors with outstanding device performance: a previously undescribed vertical architecture and highly crystalline organic rubrene thin films yield devices with high differential amplification (more than 100) and superior high-frequency performance over conventional devices. These bipolar transistors also give insight into the minority carrier diffusion length—a key parameter in organic semiconductors. Our results open the door to new device concepts of high-performance organic electronics with ever faster switching speeds."
Organic bipolar transistors (open access)
Fig. 1: OBJT [organic bipolar junction transistor] operation
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