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

Surface passivation of crystalline silicon by Cat-CVD amorphous and nanocrystalline thin silicon films C.Voz

In this work we study the electronic surface passivation of crystalline silicon with intrinsic thin silicon films deposited by Catalytic CVD. The contactless method used to determine the effective surface recombination velocity was the Quasi-Steady-State Photoconductance technique. Hydrogenated amorphous and nanocrystalline silicon films were evaluated as passivating layers on nand p-type float...

Amorphous Silicon Flat Panel Imagers for Medical Application

A new gamma camera based on hydrogenated amorphous silicon (a-Si:H) pixel arrays to be used in nuclear medicine is introduced. Various performance characteristics of a-Si:H imagers are reviewed and compared with those of currently used equipment. An important component in the a-Si:H imager is the scintillator screen. A new approach for fabrication of high resolution CsI(Tl) scintillator layers,...

Photoluminescence Properties of Alternating Nanocrystalline Silicon/amorphous Silicon Multilayers

Photoluminescence (PL) properties of alternating hydrogenated nanocrystalline silicon/amorphous silicon multilayers were investigated at room temperature and low temperature (77 K). The room-temperature PL spectra clearly show two peaks at about 1.54 and 1.7 eV. The 1.7 eV peak has no crystallite size dependence of the peak energy. The low-temperature PL spectra can be decomposed into three ban...

Thermopower of nanocrystalline germanium/hydrogenated amorphous silicon composite thin films

Origins of hole traps in hydrogenated nanocrystalline and amorphous silicon revealed through machine learning

Genetic programming is used to identify the structural features most strongly associated with hole traps in hydrogenated nanocrystalline silicon with very low crystalline volume fraction. The genetic programming algorithm reveals that hole traps are most strongly associated with local structures within the amorphous region in which a single hydrogen atom is bound to two silicon atoms (bridge bo...