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Surface bonding structure for (a) hydrogen passivated and (b) oxygen passivated nanoporous crystalline silicon, along with (c) atomic structure of hydrogen passivated nanoporous silicon with 38% porosity. The green and white spheres correspond to silicon and hydrogen atoms, respectively.
Thermal conductivity of (a) hydrogen passivated nanoporous crystalline silicon denoted by and (b) oxygen passivated nanoporous crystalline silicon denoted by , as a function of temperature from 500 to 1000 K, respectively. Thermal conductivity of unpassivated nanoporous silicon was also shown for comparison.
Ratios and as a function of porosity at 500, 750, and 1000 K, respectively. Here, , , and denote the thermal conductivity of hydrogen passivated, oxygen passivated, and unpassivated nanoporous silicon, respectively.
(a) Vibrational spectra of hydrogen passivated, oxygen passivated, and unpassivated surface Si atoms in nanoporous silicon at 500 K with 8% porosity. The phonon density of states of bulk crystalline silicon is also shown as a reference. (b) Vibrational spectra of surface hydrogen and oxygen atoms in nanoporous silicon at 500 K with 8% porosity.
Summary of nanoporous crystalline silicon systems with spherical pores in simple cubic arrangement for various porosity , pore diameter , and interfacial area concentration .
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