Quasi-Monolithic integration technology (QMIT) for power applications

In this paper, we address the most important issues related to realisation of µ-wave and mm-wave circuits containing power devices in the novel technology of Quasi-Monolithic Integration Technology (QMIT). A finite element simulator (2D and 3D), a scanning probe microscopy (SPM), a nanometer surface profiler (DEKTAK) and a Peltier element (PE) have been used to optimise the standard structure of QMIT with respect to these issues and limitations in fabrication process. The first important issue is the thermal resistance of QMIT structure. Using a 2D finite element method, the effects of the most important parameters on thermal resistance such as the distance between active device and substrate (W), the thermal conductivity of glue (kepoxy) and use of a heat spreader to decrease thermal resistance have been investigated in detail. The second important issue is the induced thermal stress in QMIT structure which results from differences in thermal expansion coefficient of materials involved. A 3D finite element simulator, a scanning probe microscopy (SPM) measurements and a nanometer surface profiler (DEKTAK) accompanied with a Peltier element (PE) have been used to simulate and measure the thermal stress distribution in QMIT standard structure. Then, the effect of the most important parameters such as W, baking temperature of epoxy and material properties of epoxy have been described in detail

PEDOT with carbon nanotubes as a replacement for the transparent conductive coating (ITO) of a heterojunction solar cell

Rheological and electrical properties of nanocomposites based on multi-walled carbon nanotubes (MWNTs) and high density polyethylene (HDPE), prepared by melt mixing in a micro-twin screw extruder, have been investigated. The effect of MWNT concentration (0.5 and 2.5 wt %) and nanotube surface treatment (oxidative treatment in a tubular furnace at 500 degrees C for 1 hr in a 95% nitrogen, 5% oxygen atmosphere) has been analyzed. It has been found that the sample conductivity with oxidation of the nanotubes decreases more than 2 orders of magnitude

Entwicklung piezoresistiver RKM-Cantilever fuer die in situ Charakterisierung von extraterrestrischen Staubpartikeln Abschlussbericht

Due to the short term of the project, only the principal technological processes for a scanning force microscope (SFM) cantilever with integrated deflection sensor could be developed. Thus, the prototype of a piezoresistive SFM cantilever, with tip glued onto the very end of the bending beam, was fabricated with the methods of silicon micro-structuring. Such cantilevers were sent to the partners in Austria (IWF, Graz) and The Netherlands (ESTEC, Nordwijk). From different test measurements special requirements concerning resonance frequency, offset bias and sensitivity of the cantilevers appear in outlines. Cantilevers with special desired facilities should be realized within the scope of a following/corresponding project (Reference No. 01 QP 97058). (orig.)SIGLEAvailable from TIB Hannover: DtF QN1(66,30) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany); Deutsche Agentur fuer Raumfahrtangelegenheiten (DARA) GmbH, Bonn (Germany)DEGerman

Untersuchung von neuartigen optischen Sonden fuer die SNOM/SNIM und integrierten Sensoren fuer die RKM Abschlussbericht

Available from TIB Hannover: F01B1388 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman