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INHALTE

Comparison of the resolution limits of thickfilms made of photostructurable pastes and laserstructured standard pastes

Bachelor thesis or project with seminar (Language: German or English)

To compare the resolution limits of laserstructuring and photostructurable paste patterning a design must be created for buried and surface located structures. Four different ways of preparation should be examined – green structuring (buried), green structuring (top), post fired structuring (top), post fired structuring (Tape on Substrate).

To compare different materials the investigations should be done with silver and gold films.

The structures must be analyzed with optical and laser scanning microscopy, SEM and XRAY inspection for as fired substrates and microsections.

 

Contact: Dipl.-Ing. Nam Gutzeit, Tel. 03677 69-3453

Investigation of titanium dioxide layers on silicon wafers regarding their wettability with glasses

Bachelor thesis or project with seminar (Language: German or English)

For the fabrication of silicon-ceramic-composite-substrates the realization of a homogeneous bond interface is functionally important. During a sintering process, a molten glass phase must homogeneously wet a silicon surface under low force. A titanium dioxide layer on the silicon surface is used as a wetting layer.

The following processings/examinations are to be carried out when working on this topic:

  • Thermal oxidation of titanium-coated wafers at different temperatures (generation of different phases of titanium oxide
  • Characterization of the generated layers
  1.  layer thicknesses (white light interferometry, ellipsometry)
  2. determination of titanium oxide phases (XRD)
  • Wetting tests with two different glasses on the produced layers
  1. application of constant quantities of glass powders
  2. sintering of samples at given tempering profiles
  • Evaluation of the wetting behavior

 Contact: Dipl.-Ing. Michael Fischer, Tel. 03677 69-3413

Development, fabrication and characterization of embedded Pt sensors in LTCC

Pt-Sensors embedded in LTCC and on surface

Bachelor thesis, master thesis or project with seminar (Language: German or English)

Pt-sensors are often used for accurate temperature measurement. In the focus of a DFG project embedded Pt-sensors will be used to monitor temperature and speed of heat generating reaction systems using the LTCC technology.

Short description of the tasks:

  • Design of embedded Pt-sensors (or sensor array) using different Platinum conductor materials in LTCC technology
  • Defining interfaces for measurement
  • Assistance during LTCC manufacturing, laser structuring of the Pt-sensors
  • Electrical measurement and characterization of the sensors

 Requirements:

  • Basic knowledges in Autocad or layout software tools would be advantageous
  • Open to new technologies and processes
  • Interest in practical work as well as optical and electrical measurements

 
Contact: Dipl.-Ing. Alexander Schulz, Tel. 03677 69-3376

Design, manufacturing and characterization of a multi-channel sampling circuit for rapidly changing voltage signals

Voltage signals, after sample-hold circuit (red) an analog input (blue)

Bachelor thesis, master thesis or project with seminar (Language: German or English)

Sensor signals are usually detected and converted from analog to discrete or digital signals using sampling circuits to provide further processing. A part of a DFG project is the development of a multi-channel sampling circuit which is able to detect fast changing voltage signals. Further computations with the converted signals should be feasible.

Short description of the tasks:

  • Design of a multi-channel sampling circuit (e.g. sample and hold)
  • Defining interfaces for input and output signals
  • Assistance during fabrication of the circuits, assembly/soldering of SMD components
  • Commissioning and characterization of the circuit

Requirements:

  • Basic knowledges in circuit/design simulation and layout software tools (e.g. Eagle)
  • Open to new technologies and processes
  • Interest in practical work as well as electrical measurements

Contact: Dipl.-Ing. Alexander Schulz, Tel. 03677 69-3376