Abstract
The Group Bernhard Gross develop research on electrical and optical properties of polymer and biopolymer materials since the 1970s, and has a long tradition of applied projects. Electrets and ferroelectric properties were the main topics of research in the beginning of its activities, mainly that devotes to storage and charge transport phenomena, origin of ferroelectricity of organic materials and ferro-to-para phase transition. In the 1980s several projects on electroacoustic devices were developed in collaboration with Telebrás. But, in the end of this decade the group started to be involved with electronic polymers. To progress with investigation of electrical and optical properties of these new class of polymeric materials, two other laboratories was created: one for organic synthesis and other dedicated to produce thin organic films. Now, inside the Group, it is possible to synthesize several classes of conjugated polymers and to process biomolecular systems. Along the 1990s and the beginning of 2000s several scientific projects and graduate thesis (at about 20) had as subject investigations on physical properties of electronic and optoelectronic organic devices. However, the conditions in which the devices are now fabricated are far from the adequate to be competitive with other laboratories (those of the developed countries). We need to improve the efficiencies and the life-time of the devices, not only to progress in the device processing but to study with accuracy transport and injection phenomena involved in ultra-thin film devices. This area of research is progressing quickly and an adequate laboratory of organic devices (OLEDs, photovoltaic diodes, transistors, sensors, etc.) is now necessary to put Brazil in conditions to realize high level basic research and competitive technological developments. The involved phenomena are in the molecular scale and, since, we are treating with devices in nanoscales, interface studies are equally important. In the near future, we will have single-molecule devices; the called Molecular Electronic; and the organic materials certainly will play an important role in this development. Therefore, investigations on properties of electronic polymers, interface phenomena, operation of devices, are of current fundamental interest, as well as to generate researchers on organic electronics. This project has as goal to investigate electrical and optical properties of electronic and optoelectronic devices, as well as interfacial effects, having polymers and biopolymers as active layers. (AU)
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