Transparent all organic TFT fabrication by low cost process without clean room

Abstract

Here is studied a process for the fabrication of a transparent all Organic Field Effect Transistor (OTFT) in a low cost way, without clean room. A major difficulty lies in the fact that substratum is CR39  , an organic glass. Pentacene, PMMA, and ITO are implemented as respectively semiconductor, insulator, and materials for source, drain and gate electrodes. In preliminary results, Ion Beam Sputtering (IBS) is used as technique for ITO deposition. Transistors characteristics are discussed. To improve the characteristics and increase the reproducibility, a DC Magnetron process is proposed for the ITO deposition on CR39  .Transparency and conductivity of the ITO layer obtained by this method are presented and discussed.

Low-energy UV effects on Organic Thin-Film-Transistors

“…Some plastic substrates can be also bent without damage, opening the doors to a broad range of new applications, such as flexible displays, lab-on-a-chip, smart textiles, ultra low cost RF-ID, etc. [9]- [13].…”

“…In fact, several works are currently being published on ever increasing hole mobility [1]- [6] with values equaling or exceeding those of amorphous silicon TFTs, at a fraction of their cost. Indeed, one of the main advantages of OTFT with respect to their inorganic counterpart, is the availability of very inexpensive production processes, such as spin-coating, etc [6]- [9], mainly due to the very low temperature required for the organic semiconductor deposition, compared to those of a-Si-TFT. Another advantage is the compatibility of organic semiconductors with plastic materials, which are lighter, more robust and much less expensive than glass.…”

Enhanced permanent degradation of organic TFT under electrical stress and visible light exposure

“…In the past, the performances of OTFTs were very poor, but nowadays, their performances reach or even exceed those of amorphous silicon TFTs [1][2][3][4][5][6][11][12][13][14][15][16]. Unfortunately, some stability issues are still present, preventing their widespread commercial use.…”

“…In fact, many inexpensive deposition techniques are available, such as spin-coating or ink-jet printing, which can be performed at temperatures much lower than those required by amorphous and poly silicon TFT [1][2][3][4][5][6]. Furthermore, organic materials are compatible with a large variety of plastic substrates, which are lighter, more robust and less expensive than glass.…”