22 citations · 56 across the 5 of their papers we have counts for
5 papers
Strongly enhanced upconversion in trivalent erbium ions by tailored gold nanostructures: toward high-efficient silicon-based photovoltaics
Jeppe Christiansen, Joakim Vester-Petersen, Søren Roesgaard +6
Upconversion of sub-band-gap photons constitutes a promising way for improving the efficiency of silicon-based solar cells beyond the Shockley-Queisser limit. 1500 to 980 nm upconv…
Analytical model for the intensity dependence of 1500 nm to 980 nm upconversion in Er: a new tool for material characterization
Jeppe Christiansen, Harish Lakhotiya, Emil Eriksen +3
We propose a simplified rate-equation model for the 1500 nm to 980 nm upconversion in Er. The simplifications, based on typical experimental conditions as well as on conclus…
Light emission from silicon with tin-containing nanocrystals
Søren Roesgaard, Jacques Chevallier, Peter I. Gaiduk +6
Tin-containing nanocrystals, embedded in silicon, have been fabricated by growing an epitaxial layer of Si_{1-x-y}Sn_{x}C_{y}, where x = 1.6 % and y = 0.04 %, followed by annealing…
Luminescence decay dynamics of germanium nanocrystals in silicon
Brian Julsgaard, Peter Balling, John Lundsgaard Hansen +2
The dynamics of the luminescence decay from germanium nanocrystals embedded in crystalline silicon has been studied for temperatures varied between 16 K and room temperature. At ro…
Anomalous temperature dependence of the the spin-flip thermalization time between the dark and bright exciton states in silicon nanocrystals
Brian Julsgaard, Ying-Wei Lu, Peter Balling +1
Silicon nanocrystals are studied by time-resolved fluorescence spectroscopy. After laser excitation the bright and dark exciton ground state levels are populated at random, but sub…