TY - JOUR AB - Using a combined all-ultra-high-vacuum process employing lateral patterning with focused ion beams and molecular beam epitaxy, site-selective growth of single (In,Ga)As quantum dots is achieved. We have embedded such a layer of intentionally positioned quantum dots in the intrinsic region of a p-i-n junction so that the quantum dots can be driven electrically. In this contribution, we will present our results on the morphological properties of the ion-beam modified surface on which the quantum dot nucleation occurs together with a characterization of the electrical and optoelectronic properties. We will demonstrate that a single, individual quantum dot can directly be electrically addressed. AU - Mehta, Minisha AU - Reuter, Dirk AU - Wieck, Andreas D. AU - Michaelis de Vasconcellos, Steffen AU - Zrenner, Artur AU - Meier, Cedrik ID - 4378 IS - 4 JF - physica status solidi (c) KW - molecular beam epitaxy KW - quantum dot KW - site control KW - electroluminescence SN - 1862-6351 TI - Electrically driven intentionally positioned single quantum dot VL - 8 ER - TY - JOUR AB - An intentional positioning of optically active quantum dots using site-selective growth by a combination of molecular beam epitaxy (MBE) and focused ion beam (FIB) implantation in an all-ultra-high-vacuum (UHV) setup has been successfully demonstrated. A square array of periodic holes on GaAs substrate was fabricated with FIB of 30 keV ions followed by an in situ annealing step. Subsequently, the patterned holes were overgrown with an optimized amount of InAs in order to achieve site-selective growth of the QDs on the patterned holes. Under well-optimized conditions, a selectivity of single quantum dot growth in the patterned holes of 52% was achieved. Thereafter, carrier injection and subsequent radiative recombination from the positioned InAs/GaAs self-assembled QDs was investigated by embedding the QDs in the intrinsic part of a GaAs-based p–i–n junction device. Electroluminescence spectra taken at 77 K show interband transitions up to the fifth excited state from the QDs. AU - Mehta, Minisha AU - Reuter, Dirk AU - Melnikov, Alexander AU - Wieck, Andreas D. AU - Michaelis de Vasconcellos, Steffen AU - Baumgarten, Tim AU - Zrenner, Artur AU - Meier, Cedrik ID - 4551 IS - 10 JF - Physica E: Low-dimensional Systems and Nanostructures KW - Molecular beam epitaxy KW - Focused ion beam KW - Self-assembled quantum dot KW - Electroluminescence SN - 1386-9477 TI - Intentionally positioned self-assembled InAs quantum dots in an electroluminescent p–i–n junction diode VL - 42 ER -