skip to main content

Title: A low thermal impact annealing process for SiO{sub 2}-embedded Si nanocrystals with optimized interface quality

Silicon nanocrystals (Si NCs) for 3rd generation photovoltaics or optoelectronic applications can be produced by several industrially compatible physical or chemical vapor deposition technologies. A major obstacle for the integration into a fabrication process is the typical annealing to form and crystallize these Si quantum dots (QDs) which involves temperatures ≥1100  °C for 1 h. This standard annealing procedure allows for interface qualities that correspond to more than 95% dangling bond defect free Si NCs. We study the possibilities to use rapid thermal annealing (RTA) and flash lamp annealing to crystallize the Si QDs within seconds or milliseconds at high temperatures. The Si NC interface of such samples exhibits huge dangling bond defect densities which makes them inapplicable for photovoltaics or optoelectronics. However, if the RTA high temperature annealing is combined with a medium temperature inert gas post-annealing and a H{sub 2} passivation, luminescent Si NC fractions of up to 90% can be achieved with a significantly reduced thermal load. A new figure or merit, the relative dopant diffusion length, is introduced as a measure for the impact of a Si NC annealing procedure on doping profiles of device structures.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. IMTEK, Faculty of Engineering, Albert-Ludwigs-University Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg (Germany)
  2. Fraunhofer ISE, Heidenhofstr. 2, 79110 Freiburg (Germany)
  3. DTF Technology GmbH, Am Promigberg 16, 01108 Dresden (Germany)
Publication Date:
OSTI Identifier:
22273677
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANNEALING; CHEMICAL VAPOR DEPOSITION; CRYSTAL DEFECTS; DIFFUSION LENGTH; HYDROGEN; INTERFACES; LUMINESCENCE; PASSIVATION; PHOTOVOLTAIC EFFECT; QUANTUM DOTS; SILICON; SILICON OXIDES; TEMPERATURE DEPENDENCE