Download Porous silicon: a quantum sponge structure for silicon based by Bisi O., Ossicini S., Pavesi L. PDF

By Bisi O., Ossicini S., Pavesi L.

The amazing photoluminescence homes of porous silicon have attracted significant examine curiosity due to the fact that their discovery in 1990. Luminescence is because of excitonic recombination quantum limited in Si nanocrystals which stay after the partial electrochemical dissolution of silicon. Porous silicon is constituted by way of a nanocrystalline skeleton (quantum sponge)immersed in a community of pores. accordingly, porous silicon is characterised by way of a really huge inner floor sector (of the order of 500m2=cm3). This inner floor is passivated yet continues to be hugely chemically reactive that is one of many crucial positive factors of this new and intricate fabric. We current an summary of the experimental characterization and theoretical modeling of porous silicon, from the coaching as much as numerous purposes. Emphasis is dedicated to the optical houses of porous silicon that are heavily with regards to the quantum nature of the Si nanostructures. The features of a number of the luminescence bands are analyzed and the underlying easy mechanisms are provided. within the quest of an eficient electroluminescent gadget, we survey the implications for a number of porous silicon contacts, with specific consciousness to the interface homes, to the steadiness requirement and to the service injection mechanisms. different gadget purposes are mentioned to boot.

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The solid line is the ®t for the energy gap. Diamonds and crosses are related to Ref. [234] and Ref. [218], respectively. local density functional calculations [207,219,229], whereas EMP means empirical or semi-empirical methods [185,216,225,227]. LDFÃ indicates calculations where also structural relaxation has been taken into account [218,220,226,234]. The great majority of the different calculations shows a Ê , give energy gaps in remarkable agreement. Si QWW, whose dimensions are of the order of $20±30 A the range of the experimental PL energies.

Their EEL spectra for PS samples with decreasing thickness are reported in Fig. 42. 9 and $34 eV (the ®rst and second Si bulk plasmon resonances) are Fig. 40. Theoretical band structure of Si along the G±D±X symmetry line calculated by Johansson et al. (after Ref. [160]). 0 O cm substrate, respectively. From Ref. [157]. O. Bisi et al. / Surface Science Reports 38 (2000) 1±126 Fig. 41. 43 Spectral analysis by Fourier±Log deconvolution applied to PS plasmon peaks. From Ref. [163]. clearly present and their intensity decreases with sample thickness.

Bisi et al. / Surface Science Reports 38 (2000) 1±126 Fig. 64. Imaginary part of the dielectric function polarized in the direction of the wire for three different values of the side length of the QWW. Inset: the same for the largest wire (solid line) compared to the component in the orthogonal plane (dashed line). From Ref. [218]. 4. Radiative lifetimes The calculated radiative lifetimes are directly related to the inverse of the oscillator strengths [279]. Table 5 reports the calculated values for the radiative lifetimes of the lowest energy transition.

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