Organic Semiconductors: Past, Present and Future

Jacob, Mohan V.

doi:10.3390/electronics3040594

Cited by 36 publications

(14 citation statements)

References 26 publications

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“…[1] In fabricating the active organic semiconductor layer in organic electronics, both thermal deposition and solution process have been generally employed, where the latter offers excellent prospects for more economic, lower temperature and faster manufacturing. In solution processed organic opto-electronics such as organic lightemitting diodes (OLEDs), organic solar cells (OSCs) and organic photodiodes (OPDs), the active layer typically consists of a blend of appropriate guest/host or donor/acceptor molecules, co-dissolved in an organic solvent and subsequently deposited on a substrate using such as spin-coating to form a guest-host (in OLEDs) or a bulk heterojunction (in OSCs and OPDs) layer.…”

Section: Introductionmentioning

confidence: 99%

Aggregates of diketopyrrolopyrrole dimers in solution

et al. 2017

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Abstract3D excitation-emission spectroscopy disentangles the spectroscopic properties of aggregates and non-aggregates of DPPs based dimers, Rertob Wawrzinek, Xiuwen Zhou, Mujeeb Ullah, Ebinazar B. Namdasa, and Shih-Chun Lo M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractDimers based on diketopyrrolopyrrole (DPP) chromophores have gained tremendous interest as an excellent material building block for organic solar cells and photodiodes.However, a counterintuitively blue shift in their solution absorption spectra of DPP chromophores occurs with an increasing number of thiophene bridging units. We allocate this as chromophore aggregates in solution, which might hinder adequate mixing in the blends, leading to poor film forming quality and reduced charge generation in solution processed devices. Hence, identification of such aggregates is crucial in order to find measures for device optimisation. In this study, we present synthesis and characterisation of three pyridyl end-capped DPP dimers of different conjugation length using thiophene linkers and compare their parent monomer to evidence the behaviours of aggregates in solution.We employ conventional and temperature dependent UV-Vis spectroscopy, fluorescence and excitation-emission spectroscopy as well as TD-DFT calculations to show that such DPP dimers predominantly form aggregates in solution even at low concentrations. By disentangling the spectroscopic behaviour of both aggregated and non-aggregated species, we refute literature's explanation that the apparent blue shift in absorption arises from a reduced conjugation length due to more molecular flexibility. Instead, absorption and emission signals of non-aggregated dimers are mostly masked by their aggregated species.This work provides a tool set using common laboratory spectroscopic equipment to identify and characterise solution aggregates-information particularly important towards optimisation of organic electronics processed from solution.

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Section: Introductionmentioning

confidence: 99%

Aggregates of diketopyrrolopyrrole dimers in solution

et al. 2017

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“…The discovery of highly conducting polyacetylene in 1977 with the first true evidence of conductive polymers exhibiting conductivity comparable to metals led to the recognition of Heeger, MacDiarmid and Shirakawa with the Nobel prize in 2000 [2]. The range of organic semiconductor materials available has expanded tremendously and these materials are now ubiquitous in consumer electronics [3] with organic field effect transistors (OFETs) and organic light emitting diodes (OLEDs) being a fundamental electronic building blocks of organic electronic circuits.…”

Section: Introductionmentioning

confidence: 99%

Amine Detection Using Organic Field Effect Transistor Gas Sensors

Mougkogiannis

Turner

Persaud

2020

Sensors

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Low power gas sensors with high sensitivity and selectivity are desired for many practical applications. Devices based on organic field effect transistors are promising because they can be fabricated at modest cost and are low power devices. Organic field effect transistors fabricated in bottom-gate bottom-contact configuration using the organic semiconductor [2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl)thieno] [3,2-b]thiophene) (DPP-T-TT) were systematically investigated to determine the response characteristics to a series of alkylamines and ammonia. The highest sensitivity was to dibutylamine with a limit of detection of 0.025 ppb, followed by n-butylamine, 0.056 ppb, and ammonia, 2.17 ppb. A model was constructed based on the Antoine equation that successfully allows the empirical prediction of the sensitivity and selectivity of the gas sensor to various analytes including amines and alcohols based on the Antoine C parameter and the heat of the vaporization of the analyte.

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“…Organic electronics is an active area of materials science research that has recently expanded beyond traditional use in transistors and light-emitting diodes to devices and applications in chemistry and biology. [20][21][22] Poly(3,4ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one pi-conjugated polymer that is both conductive and electrochemically active, enabling both coupling to metal contacts (for application of an applied voltage from a power source) and liquid solutions (for electron-to-ion charge transfer based on solid-phase redox reactions). 23 Commercial PEDOT:PSS solutions contain a mixture of doped (oxidized and positively charged) and undoped (reduced, neutral) PEDOT polymer chains and can be used as both anode and cathode material for ionic current injection into biological solutions.…”

Section: Introductionmentioning

confidence: 99%

High-Capacity Redox Polymer Electrodes: Applications in Molecular and Cellular Processing

et al. 2018

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We present methods to fabricate high-capacity redox electrodes using thick membrane or fiber casting of conjugated polymer solutions. Unlike common solution casting or printing methods used in current organic electronics, the presented techniques enable production of PEDOT:PSS electrodes with high charge capacity and the capability to operate under applied voltages greater than 100 V without electrochemical overoxidation. The electrodes are shown integrated into several electrokinetic components commonly used in automated bioprocess or bioassay workflows, including electrophoretic DNA separation and extraction, cellular electroporation/lysis, and electroosmotic pumping. Unlike current metal electrodes used in these applications, the high-capacity polymer electrodes are shown to function without electrolysis of solvent (i.e., without production of excess H, OH, and HO by-products). In addition, each component fabricated using the electrodes is shown to have superior capabilities compared with those fabricated with common metal electrodes. These innovations in electrokinetics include a low-voltage/high-pressure electroosmotic pump, and a "flow battery" (in which electrochemical discharge is used to generate electroosmotic flow in the absence of an applied potential). The novel electrodes (and electrokinetic demonstrations) enable new applications of organic electronics within the biology, health care, and pharmaceutical fields.

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Organic Semiconductors: Past, Present and Future

Cited by 36 publications

References 26 publications

Aggregates of diketopyrrolopyrrole dimers in solution

Aggregates of diketopyrrolopyrrole dimers in solution

Amine Detection Using Organic Field Effect Transistor Gas Sensors

High-Capacity Redox Polymer Electrodes: Applications in Molecular and Cellular Processing

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