Carriers multiplication in silicon nanocrystals (Si-ncs) in a one promising eefect to considerably enhance conversion efficiency of solar cells that can overcome theoretical limits. A close proximity of Si-ncs is an essential factor for carrier multiplication due to the separated quantum cutting effect. In this study we present results on investigation of 3-dimensional (3D) surface engineering of Si-ncs directly in water. Thus at the same time allow close proximity Si-ncs without of using any surfactant. The approach is based on ns laser treatment of Si-ncs dispersed in liquid solution. We explore the excitation wavelength dependence of photoluminescence quantum yield (ratio of the number of emitted and absorbed photons) for Si-ncs as prepared and surface engineered by ns laser processing. Our results suggest that close proximity of Si-ncs in spherical particles induced by laser processing might enhance also carriers multiplication.
|Title of host publication||Unknown Host Publication|
|Number of pages||4|
|Publication status||Published - 8 Jun 2012|
|Event||THE 38th IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - |
Duration: 8 Jun 2012 → …
|Conference||THE 38th IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE|
|Period||8/06/12 → …|
Svrcek, V., Mariotti, D., Matsubara, K., & Kondo, M. (2012). Carriers Multiplication in Neighboring Surfactant-free Silicon Nanocrystals Produced by 3D-surface Engineering in Liquid Medium. In Unknown Host Publication IEEE.