Self-Organized Quantum Dots for Memories

Electronic Properties and Carrier Dynamics

  • Tobias Nowozin

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xvi
  2. Tobias Nowozin
    Pages 1-4
  3. Tobias Nowozin
    Pages 5-24
  4. Tobias Nowozin
    Pages 25-39
  5. Tobias Nowozin
    Pages 51-68
  6. Tobias Nowozin
    Pages 127-129
  7. Back Matter
    Pages 131-153

About this book


Today’s semiconductor memory market is divided between two types of memory: DRAM and Flash. Each has its own advantages and disadvantages. While DRAM is fast but volatile, Flash is non-volatile but slow. A memory system based on self-organized quantum dots (QDs) as storage node could combine the advantages of modern DRAM and Flash, thus merging the latter’s non-volatility with very fast write times.
This thesis investigates the electronic properties of and carrier dynamics in self-organized quantum dots by means of time-resolved capacitance spectroscopy and time-resolved current measurements. The first aim is to study the localization energy of various QD systems in order to assess the potential of increasing the storage time in QDs to non-volatility. Surprisingly, it is found that the major impact of carrier capture cross-sections of QDs is to influence, and at times counterbalance, carrier storage in addition to the localization energy. The second aim is to study the coupling between a layer of self-organized QDs and a two-dimensional hole gas (2DHG), which is relevant for the read-out process in memory systems. The investigation yields the discovery of the many-particle ground states in the QD ensemble. In addition to its technological relevance, the thesis also offers new insights into the fascinating field of nanostructure physics.


Coupling of Quantum Dots to a Two-dimensional System Deep-Level Transient Spectroscopy (DLTS) Embedded Quantum Dots GaSb/GaAs, InAs/GaAs Hole Storage Many-particle Ground States Modulation-Doped Field-Effect Transistor Quantum Dot Memory Self-assembled Quantum Dots

Authors and affiliations

  • Tobias Nowozin
    • 1
  1. 1.Institut für FestkörperphysikTechnical University of BerlinBerlinGermany

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