Ossila's new range of robust and reusable platinum test chips are designed to save you time and money.

The OFETs were patterned via photolithography, meaning very narrow channel lengths are acheivable.

The platinum is sputtered onto a titanium adhesion layer to provide an extremely robust contact and channel allowing it to withstand cleaning procedures such as solvent sonication, plasma etching, and swabbing. This allows the test chips to be reused multiple times for testing various materials saving a significant amount of time and money. 

NOTE: Patterning using photolithography leaves exposed edges of the titanium adhesion layer. The consequence of this is that charge injection into the semiconducting layer can occur from the adhesion layer boundary instead of the platinum. Therefore these devices are recommend for single-crystal or single-flake materials that can sit on top of the electrode and span the electrode gap.

Mobility screening is made quick and simple with our prefabricated high density test chips, by depositing your semiconductor directly onto the surface you can create up to 20 OFETs on a single chip. In addition when using our  high-density OFET test board you can test an entire chip in as little as 3 minutes reducing the overall time of both fabrication and measurement.

 

Productcode	Channelgeometry	Channelwidth	Channellength	Electrode pairs	Quantity	Price
S403A1	Linear	1 mm	2-10 μm Variable	20	1	£83
S403A2	Linear	1 mm	4-10 μm Variable	16 (minimum)	1	£50
S411	Interdigitated	26.6 mm	5 μm	20	1	£83

 

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User Manual

Specifications

Substrate / Gate	Silicon (p-doped)
Gate dielectric	300 nm thermally grown silicon dioxide
Source-Drain electrodes	Platinum (100 nm) / Titanium adhesion layer (5 nm)
Depostion method	Plasma sputtering
Patterning method	Photolithography

 

Applications

Ossila High Density Substrates feature up to 20 OFETs which can benefit your research in a number of ways. Firstly, production cost is reduced as a result of a higher volume of OFETs per substrate compared to the low density equivalents. This can help to stretch your budget to allow you to produce and test larger numbers of OFETs.

Secondly, producing OFETs is a far faster and less laborious process. Fabrication time is reduced by up to 50% when using prefabricated high density OFETs, freeing up more time to test the devices. As a result of this, greater volumes of statistics can be produced which in turn can provide more robust and reliable research.

Furthermore, OFET variability is reduced since a larger number of OFETs are produced with each fabrication. At Ossila we have optimised the fabrication process in order to produce consistently high quality substrates. In this respect, using our prefabricated substrates rather than fabricating your own can help you to gather more reliable data to benefit your research project.

Prefabricated high density substrates are ideal for mobility testing as they enable swift, efficient testing of high volumes of OFETs. The Ossila high-density OFET test board has been designed for this purpose. 

Rather than using a mechanical probe station to test OFETs, which is a delicate and time-consuming process, the high density test board allows testing of multiple OFETs at one time; simply drop the substrate into the test slot, secure the push-fit lid and connect the board via its BNC connectors to an array of test equipment.

The board has been intelligently designed to reduce external noise, leakage current and stray capacitance in order to provide reliable and precise low-current testing.

 

 

Specifications

We fabricate our platinum test chips from p-doped silicon substrates. An insulating 300 nm silicon oxide gate dielectric is first grown on both sides of the silicon. The source and drain contacts consist of a 5 nm titanium adhesion layer below 100 nm of platinum. A platinum gate contact is also deposited along one edge of each substrate.

It is essential that there is an electrical connection between the gate contact and the p-doped silicon on the substrate sides. When the substrates are diced, a weak electrical connection is formed, however this can be easily removed when cleaning the substrate. We recommend applying silver (conductive) paint along and around the gate contact edge so that a more robust connection is made  with the substrate edge.

 

For individual details and dimension drawings of each substrate type see below.

 

Linear variable channel length substrates (S403 & S404)

Geometry	Linear
Arrangement (S403)	20 electrode pairs, 5 channel widths
Arrangement (S404)	16 electrode pairs minimum, 4 channel widths minimum*
Channel width	1 mm
Channel lengths	2 (S403A1 only), 4, 6, 8, and 10 µm

*Please note that the fabrication and layout of S403 and S404 is identical, however one or more of the 2 µm channels is not fully resolved on the S404 substrates. All four 2 µm channels are present on the S403 substrates.

 

  

Interdigitated 22.6 mm x 5 µm constant channel length substrate (S411)

Geometry	Interdigitated
Arrangement	20 identical OFETs
Channel width	22.6 mm
Channel length	5 µm

 

To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.

 

About Ossila Founded in 2009 by organic electronics research scientists, Ossila aims to provide the components, equipment, and materials to enable intelligent and efficient scientific research and discovery. Over a decade on, we're proud to supply our products to over 1000 different institutions in over 80 countries globally. With decades of academic and industrial experience in developing organic and thin-film LEDs, photovoltaics, and FETs, we know how long it takes to establish a reliable and efficient device fabrication and testing process. As such, we have developed coherent packages of products and services - enabling researchers to jump-start their organic electronics development program. The Ossila Guarantee Free Worldwide Shipping Eligible orders ship free to anywhere in the world Fast Secure Dispatch Rapid dispatch on in-stock items via secure tracked courier services Quality Assured Backed up by our free two year warranty on all equipment Clear Upfront Pricing Clear pricing in over 30 currencies with no hidden costs Large Order Discounts Save 8% on orders over $10,300.00 and 10% on orders over $12,900.00 Expert Support Our in-house scientists and engineers are always ready to help Trusted Worldwide Great products and service. Have already recommended to many people. Dr. Gregory Welch, University of Calgary Wonderful company with reasonably priced products and so customer-friendly! Shahriar Anwar, Arizona State University The Ossila Team Prof. David Lidzey - Chairman As professor of physics at the University of Sheffield, Prof. David Lidzey heads the university’s Electronic and Photonic Molecular Materials research group (EPMM). During his career, David has worked in both academic and technical environments, with his main areas of research including hybrid organic-inorganic semiconductor materials and devices, organic photonic devices and structures and solution processed photovoltaic devices. Throughout his academic career, he has authored over 220 peer-reviewed papers. Dr. James Kingsley - Managing Director James is a co-founder and managing director of Ossila. With a PhD in quantum mechanics/nanotech and over 12 years’ experience in organic electronics, his work on the fabrication throughput of organic photovoltaics led to the formation of Ossila and the establishment of a strong guiding ethos: to speed up the pace of scientific discovery. James is particularly interested in developing innovative equipment and improving the accessibility of new materials for solution-processable photovoltaics and hybrid organic-inorganic devices. Dr. Alastair Buckley - Technical Director Alastair is a lecturer of Physics at the University of Sheffield, specialising in organic electronics and photonics. He is also a member of the EPMM research group with a focus on understanding and applying the intrinsic advantages of functional organic materials to a range of optoelectronic devices. Alastair’s experience has not been gained solely in academia; he previously led the R&D team at MicroEmissive Displays and therefore has extensive technical experience in OLED displays. He is also the editor and contributor of "Organic Light-Emitting Diodes" by Elsevier. Our Research Scientists Our research scientists and product developers have significant experience in the synthesis and processing of materials and the fabrication and testing of devices. The vision behind Ossila is to share this experience with academic and industrial researchers alike, and to make their research more efficient. By providing products and services that take the hard work out of the device fabrication process, and the equipment to enable accurate, rapid testing, we can free scientists to focus on what they do best - science. Customer Care Team The customer care team is responsible for the customer journey at Ossila. From creating and providing quotes, through to procurement and inventory management, the customer care team is devoted to providing first class customer service. The general day to day responsibilities of a customer care team member involves processing customers orders and price queries, answering customer enquiries, arranging the shipment of parcels and notifying customers of updates on their orders. Collaborations and Partnerships Please contact the customer care team for all enquires, including technical questions about Ossila products or for advice on fabrication and measurement processes. Location and Facilities Ossila is based at the Solpro Business Park in Attercliffe, Sheffield. We operate a purpose-built synthetic chemistry and device testing laboratory on site, where all of our high-purity, batch-specific polymers and other formulations are made. This is complemented by a dedicated suite of thin-film and organic electronics testing and analysis tools within the device fabrication cluster housed in a class 1000 cleanroom in the EPSRC National Epitaxy Facility in Sheffield. All our electronic equipment is manufactured on-site.