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Impact of composition and morphology on the optical properties of Si-NC/P3HT th...

Blends of Si nanocrystals (Si-NCs) and organic semiconductors are promising materials for new optical and electronic devices processed from solutions. Here, we study how the optical properties of composite films containing Si-NCs and the organic semiconductor poly(3-hexylthiophene) (P3HT) are influenced by the composition and morphology resulting from different solution-processing parameters and different solve...

Study on excimer laser irradiation for controlled dehydrogenation and crystalli...

We report on the excimer laser annealing (ELA) induced temperature gradients, allowing controlled crystal-lization and dehydrogenation of boron-doped a-Si:H/nc-Si:H multilayers. Depth of the dehydrogenation and crystallization process has been studied numerically and experimentally, showing that temperatures below the monohydride decomposition can be used and that significant changes of the doping profile can be ...

Structural and photoluminescence studies of erbium implanted nanocrystalline si...

Hydrogenated amorphous and nanocrystalline silicon thin films deposited by Hot Wire (HW) and Radio-Frequency Plasma-Enhanced (RF) Chemical Vapor Deposition were Er-bium-implanted. Their pre-implantation structural properties and post-implantation optical properties were studied and cor-related. After one-hour annealing at 150ºC in nitrogen atmos-phere only amorphous films showed photoluminescence (PL) activity ...

Cascade up-conversion of photoluminescence in quantum dot ensembles

We present a theoretical model and Monte Carlo simulation results that naturally explain all the features of the thermally activated photoluminescence upconversion effect also known as anti-Stokes photoluminescence ASPL observed in ensembles of colloidal semiconductor nanocrystal quantum dots QDs . The proposed ASPL mechanism includes the following principal ingredients: i optical-phonon-assisted absorpt...

Hot-wire chemical vapour deposition and characterization of silicon nitride mem...

Optimization of deposition parameters for thin silicon films on flexible substr...

This paper studies the deposition of thin silicon films from silane on plastic substrates in a recently build hot-wire chemical vapor deposition reactor. Hydrogen dilution of silane was used to induce amorphous-to-nanocrystalline phase transition. Thin-film deposition rate, r(d), is roughly proportional to silane concentration during deposition but the proportionality factor depends on filament temperature, T-f...

FIR absorption in CdSe quantum dot ensembles

Absorption of far-infrared (FIR) radiation in very small CdSe crystallites (quantum dots, QDs) via excitation of confined dipolar vibrational modes was studied, both theoretically and experimentally. Spatial quantisation of optical phonons was analysed in the framework of a continuum model, which couples the phonon amplitude to the electrostatic potential via the Fro¨ hlich interaction. The frequencies and osci...