Open Positions

Master Thesis: Designed Architectures of Si Nanoparticles on Self‐Assembled Monolayers

self-assembled monolayers deposited on gold

Figure 1: Schematic of self-assembled monolayers deposited on gold and their interaction with nanoparticles.

There is an increasing interest to fabricate new generation electronic devices, which are based on the quantum properties of nanostructured materials. In particular, nanoparticles are being intensively investigated as ideal building blocks for the new devices, because of their semiconducting properties, nanoscale size and size tunable electronic structure [1].

The aim of this project is to create a stable immobilization and homogenous distribution of these nanostructures on solid substrates, which can allow for device optimization and electrical characterization. Moreover, we are interested in controlling and modifying the positioning of the nanostructures at the nanoscale by using chemically patterned self‐assembled monolayers of organophosphonic acids on the surface as a template for the selective organization of the nanoparticles [2, 3].

Different surface techniques will be employed to characterize the novel functional interfaces generated, such as X‐ray photoelectron spectroscopy, contact angle, atomic force microscopy, electrochemistry, and Raman spectroscopy. Finally, the novel nanodevices fabricated will be characterized with respect to their electronic properties using electrical measurements.

[1] Matthew G. Panthani and Brian A. Korgel: Nanocrystals for Electronics, Annu. Rev. Chem. Biomol. Eng., 2012, 3, 287–311.

[2] H. X. He, H. Zhang, Q. G. Li, T. Zhu, S. F. Y. Li, and Z. F. Liu: Fabrication of Designed Architectures of Au Nanoparticles on Solid Substrate with Printed Self‐Assembled Monolayers as Templates, Langmuir2000, 16, 3846‐3851.

[3] A. Cattani‐Scholz et al.: A New Molecular Architecture for Molecular Electronics, Angewandte Chemie‐International Edition 2011, 50, A11.

For further information please contact Dr. Anna Cattani-Scholz and Dr. Rui Nuno Pereira.


Diploma/Master Thesis: Control of graphene properties and functionality for applications in nanosensing

Graphene, a single sheet of graphite, is an emerging new material for nanoelectronic devices. As a truly two-dimensional system and a zero-gap semiconductor, graphene possesses a number of remarkable electronic properties such as tunable carrier type and density as well as exceptionally high carrier mobility, making it ideal for use in nanoelectronics. However, chemical functionalization schemes are needed to integrate graphene with the diverse range of materials required for device applications. This project aims at developing and studying a new graphene-organic hybrid material for applications in microelectronics; the new material proposed, while maintaining the excellent properties of classical graphene, will have improved processability in solution, chemical functionalization and adjustable optoelectronic properties. Through the controlled chemical modification of graphene, this project shall explore the introduction of surface functionalities to allow grafting of organic and bioorganic molecules. The influence of the functionalization of graphene on the generation of defects, strain, and doping will be investigated using Raman spectroscopy as well as electrical measurements. Finally, integration of the novel hybrid materials generated into graphene solution-gated field effect transistors (G-SGFETs) will be investigated.


Activities & Techniques:

  • Controlled generation of H- and OH-defects on graphene
  • Controlled grafting of functional organic molecules (proteins, DNA)
  • Structural and chemical characterization using X-ray photoelectron spectroscopy, Raman spectroscopy, impedance spectroscopy, and conductive atomic force microscopy.

 

For further information please contact Anna Cattani-Scholz

 

Master Thesis: Optoelectronic Characterization of Hybrid Systems of Organic and Inorganic Semiconductors

Hybrid systems of organic and inorganic semiconductors are attractive for novel types of solar cells and light emitting devices, as they combine the high carrier mobility and stability of inorganic materials with the low production costs and the flexibility of organic semiconductors. In order to identify the most promising material combinations, the properties of the hybrid systems need to be understood in detail. In this work, the organic semiconducting molecule F16cupc (Fig. 1) will be deposited on inorganic semiconductors like Si, SiC, or GaN by organic molecular beam deposition. After optimizing the organic thin film growth, the resulting hybrid systems (Fig. 2) will be characterized with respect to their structural and optoelectronic properties.

The aim of this project is to gain information about the influence of the choice of the organic and inorganic semiconductor materials on the organic/inorganic interface of the heterojunction.

                                     

Fig. 1: The organic semiconductor F16CuPc.        Fig. 2: Schematic of the device layout.

Techniques you will be trained in:

  • Device fabrication (including, for example, photolithography, metal contact deposition, organic molecular beam deposition)
  • Structural characterization, e.g. atomic force microscopy (AFM)
  • Optoelectronic characterization, e.g. current-voltage measurements, contact potential difference measurements, capacitance and impedance spectroscopy

Conditions and requirements:

  • Duration: one year, full-time
  • Possible start date: from March 2018 on
  • Focus on condensed matter physics, applied engineering physics or related fields
  • Basic knowledge of semiconductor physics
  • Completion of all exams necessary for master’s degree

For further information, please contact Hannah Schamoni. To apply, please submit your CV and your transcript of records.

 

TUM Technische Universität München TUM Technische Universität München Physik Department Elektrotechnik und Informationstechnik TUM Technische Universität München
 

Events & News

17 Jan 2018

ERC Consolidator Grant for Gregor Koblmüller   more

16 Jan 2018

Light-steering of spin-polarized currents in topological insulators   more

10 Aug 2017

Best Poster Awards for Ganpath Veerabathran and Alexander Andrejew at iNOW 2017   more

27 Jun 2017

Best Poster Award at Nanowire Week for Jochen Bissinger   more

15 Mar 2017

Dr. Kai Müller admitted to the “Junges Kolleg” of the Bavarian Academy of Sciences   more

Seminars

March 12, 2018

Two-dimensional coherent spectroscopy of a semiconductor microcavity   more

March 05, 2018

Diamond-organic photovoltaics   more