6,13-bis(triisopropylsilylethinyl)pentacene commonly known as TIPS pentacene.
A high-purity TIPS-Pentacene for use in organic field-effect transistors (OFETs). In stock for immediate delivery to academic institutions in Europe and other selected geographical areas outside of North America. TIPS-Pentacene is widely used as a high performance small molecule for OFET applications, with a mobility in excess of 1 cm2/Vs having being achieved in the literature. It has excellent solubility in a range of common organic solvents, and a good ambient stability - making it easy to process into devices. Ossila"s TIPS-pentacene has been produced with a purity of >99.9%.
Please note that TIPS-Pentacene is unavailable to buyers in the USA. Any incoming orders from the USA for TIPS-Pentacene will not be processed.
General Information
| Full name | 6,13-Bis(triisopropylsilylethynyl)pentacene |
| Synonyms | TIPS-pentacene |
| CAS number | 373596-08-8 |
| Chemical formula | C44H54Si2 |
| Molecular weight | 639.07 g/mol |
| Solvents | Anisole, butylbenzene, chlorobenzene, chloroform, dichlorobenzene, tetrahydrofuran, toluene, xylene |
| Classification / Family | Molecular semiconductors, Small molecule semiconductosr, Organic Field-Effect Transistors (OFETs), soluble semiconductor materials, Pentacene derivatives |
Product Details
| Purity | > 99 % (HPLC)> 99% (1H-NMR) |
| Melting point | 259 °C (DSC) |
| Appearance | Dark blue solid |
Characterisation
OFET fabrication procedure
Abstract
We have achieved a mobility of approximately 0.92 cm2/Vs using TIPS-Pentacene for top contact OFETs with a drop casting protocol. The TIPS-Pentacene film is obtained through slow crystallisation growth at high temperature (50°C), in solvent saturated ambient, over silicon oxide substrates treated with phenyl-terminated silane molecules.
Results
The image below depicts the best performance OFET, showing how the boundaries of the crystals forming the crystallite domain have boundaries parallel to the channel length. Cracks perpendicular to the growth direction are also clearly visible. These cracks act as defects (bottlenecks for charge transport) and must be minimised in order to obtain high-performing OFETs.
FET measurements
The table below summarises the mobility and threshold voltage for the three PTES-treated substrates, taking an average of 75% of the 15 OFET devices to minimise the maximum and minimum outliers.
| Devices Measured | Mobility (cm2/Vs) | VT (V) |
| 15 | 0.28 +/- 0.06 | -5.14 +/- 2.75 |
Drop casting details
The direction of the crystal growth, and therefore the orientation of the crystal axes (with respect to the channel length), can be controlled by imposing a preferential drying direction to the drop casted solution. This is achieved by positioning the substrate inside a Petri dish at a 3.5° angle with respect to the horizontal line of a perfectly flat hot plate. Substrates are placed inside the Petri dish in a manner such that the length of the channel is perpendicular to the receding direction of the drying solution. Drop casting is carried out using a pipette with the substrate at a temperature of 50°C. The lid was put back immediately afterwards to trap the solvent vapour and create a vapour-saturated condition inside the Petri dish.
Images below taken of thin films of TIPS-pentacene deposited by spin casting and drop casting from toluene (10 mg/ml) on SiO2, showing the strong crystallisation behaviour in slow dried films.
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Experimental
OFET device specifications
This table shows details of the substrates used in this fabrication routine.
| Substrates | Ossila silicon/silicon dioxide substrates (S146) |
| Substrate size | 20 x 15 mm |
| Gate conductivity | 1-30 Ω·cm (Boron doped) |
| Silicon oxide thickness | 300 nm |
| Device per substrates | Five, common gate |
| Channel length | 30 µm |
| Channel width | 1000 µm |
| OFET architecture | Top contact, bottom gate |
| Source-Drain patterning | Thermal evaporation using Source-Drain Deposition Mask for Low Density OFETs |
TIPS-Pentacene Solution Preparation
Preparation of the stock solution took place in a glove box (O2 << 10 ppm; H2O). The solution used for drop casting was prepared only when needed. TIPS-pentacene is relatively resilient to oxidation at room temperature. However, long permanence in normal ambient condition (>24 hrs) can result in molecular degradation and increased water content of the solution.- TIPS-pentacene dissolved in anhydrous toluene, 10 mg/ml, to make stock solution
- The stock solution is placed on a hotplate at 60°C for 1 hour at 1000 rpm with a magnetic stirrer
- Solution was then filtered with 0.45 µm filter into a new vial
- Required amount was diluted with anhydrous toluene to 2 mg/ml
Substrate cleaning
- 1% Hellmanex III solution in hot DI water
- Sonicate for 5 min in hot water
- Rinse twice in hot water
- IPA, Sonicate 5 min in hot water
- Rinse twice in DI water (cold)
- Store substrates in DI water
- UV Ozone treatment for 5 min
Surface Treatments
- PTES (Trichloro(phenethyl)silane) treatment: 3 mMol in toluene for 15 hrs in glove box at 90°C or, alternatively
- PTS (Trichloro(phenyl)silane) treatment: 3% in weight in toluene at 90°C for 15 hrs in glove box
- Substrates rinsed twice in glove box with toluene, then blow dried and brought outside a glove box
- Sonicated in toluene for 10 minutes and blow dried
- Rinsed with 2 ml of acetone and blow dried
- Rinsed with 2 ml of IPA and blow dried
- Put in glove box on hotplate at 150°C for 5 min
TIPS-pentacene drop casting
- Pipetted 50 μl of TIPS solution (2 mg/ml) onto each substrate, which were sitting within a petri dish
- Covered with glass lid for 5 minutes on a hot plate at 50°C
- Hot plate switched off and left to cool down to close to room temperature
- Using cleanroom swabs wetted with toluene, wiped the substrates clean with the exception of the area over which the drain and source were to be deposited
- Loaded the substrates into the evaporation stack for low density OFETs
Deposition of top contact gold
- Loaded Edwards Auto 306 thermal evaporator
- Evaporator left to pump down to low pressure (ca. 2 x 10-6 mBar)
- Deposited 80 nm of gold on TIPS-pentacene-coated substrates
OFETs were measured using an Ossila Test Board for Low-Density OFETs (E222) under air.
To download the full report click here
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.
