Ultrafast Bimolecular Recombination in Nanocrystalline Hydrogenated Silicon

Determination of recombination coefficients for nanocrystalline silicon embedded in hydrogenated amorphous silicon.

The spectroscopic pump-probe reflectance method was used to investigate recombination dynamics in samples of nanocrystalline silicon embedded in a matrix of hydrogenated amorphous silicon. We found that the dynamics can be described by a rate equation including linear and quadratic terms corresponding to recombination processes associated with impurities and impurity-assisted Auger ionization, ...

Electronic conductivity of hydrogenated nanocrystalline silicon films

A heteroquantum-dots (HQD) model for hydrogenated nanocrystalline silicon films (nc-Si:H) is proposed. The main features of our model are as follows. (i) the nanocrystalline grains and the amorphous counterparts in which they are embedded have very different band gap and band structures. As a result, they form heterojunctionlike structures in the interface regions, where the band offset effects...

Light absorption engineering of hydrogenated nanocrystalline silicon by femtosecond laser.

The light absorption coefficient of hydrogenated nanocrystalline silicon has been engineered to have a Gaussian distribution by means of absorption modification using a femtosecond laser. The absorption-modified sample exhibits a significant absorption enhancement of up to ∼700%, and the strong absorption does not depend on the incident light. We propose a model responsible for this interesting...

Thermopower of nanocrystalline germanium/hydrogenated amorphous silicon composite thin films

Conduction mechanisms in doped mixed-phase hydrogenated amorphous/nanocrystalline silicon thin films