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Kippelen, Bernard

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Organic Semiconductors in the Fourth Industrial Revolution

2019-03-12 , Kippelen, Bernard

In this talk, we will discuss how printable organic conjugated semiconducting molecules and polymers are creating new disruptive technologies that are impacting all industries. We will present recent advances in various solid-state device platforms including, organic light-emitting diodes (OLEDs), organic photodetectors (OPDs), organic photovoltaic devices (OPVs), and organic thin-film transistors (OTFTs). We will emphasize the importance of interfaces in devices and show examples on how to engineer their electrical properties. We will present a simple processing technique for the electrical doping of organic semiconductors over a limited depth near the surface of the film that is based on immersing the film into a polyoxometalate solution. Such approached can drastically reduce the fabrication cost of such devices, simplify device architecture, and lead to all-organic devices fabricated by all-additive printing techniques. As an illustration of the simplicity and versatility of this process we will discuss how high-performance organic solar cells with simplified architecture can be implemented. Finally, we will present the results of a detailed operational lifetime study of OTFTs showing that organic photonics and electronics can yield a stability level superior to that of amorphous silicon.

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Organic Photovoltaics

2010-02-11 , Kippelen, Bernard

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Strategies to Control Interfaces in Organic Electronic Designs

2014-10-16 , Kippelen, Bernard

Printed organic electronics, a technology based on organic semiconductors that can be processed into thin films using conventional printing and coating techniques, has been the subject of active research and development over the past decades. Due to their ability to be processed at low temperature, over large areas, at low cost, organic semiconductors are experiencing an accelerated development that will lead to a new generation of products with thin and flexible form factors. While the organic semiconductor layer plays a central role, the interfaces that are formed between the organic semiconducting layer and adjacent oxide layers or electrodes are very critical and often determine the overall electrical performance of the device. In this talk, we will discuss the performance of a range of solid-state devices, including organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), sensors, and organic solar cells. We will present strategies to modify and stabilize the electronic properties of interfaces that can yield devices with improved performance and longer lifetime. We will show that these advances are likely to accelerate the deployment of flexible printed electronic technologies

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The Dawn of Organic Optoelectronics

2007-08-14 , Kippelen, Bernard

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Organic Semiconductors for Flexible Printed Electronics

2012-09-11 , Kippelen, Bernard

Advances during the last 30 years in the synthesis and processing of organic materials with nonlinear optical and semiconducting properties, have fueled the emergence of a new technology that can potentially lead to low cost, flexible, and large area plastic optoelectronic devices and systems. Recent research breakthroughs in light-emitting diodes for displays and lighting, solar cells for portable power, and thin-film transistors are bringing flexible electronic technologies closer to commercialization. However, despite these technological advances, many challenges still remain in understanding the fundamental physical properties of the organic semiconductors used as active layers and the contacts they form at interfaces with adjacent organic layers or other materials used as electrodes. In this talk, we will discuss selected examples of recent advances made in developing new materials and device architectures that lead to organic light-emitting diodes, organic solar cells, and field-effect transistors with superior performance and stability. In particular, we will review several strategies that were employed to control the work function of electrodes and show how these approaches can be used to design organic solar cells with novel geometries. We will also present studies of the operational and environmental stability of flexible organic field-effect transistors that are comprised of a dual-layer gate dielectric. This architecture was found to yield to devices with unprecedented stability. Finally, we will discuss some of the challenges and future directions of this disruptive emerging technology platform.

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