Energy Efficiency and Renewable Energy Through by Junshuai Li, Hong-Yu Yu (auth.), Ling Zang (eds.)

By Junshuai Li, Hong-Yu Yu (auth.), Ling Zang (eds.)

Reflecting the quick development of nanotechnology learn and the capability effect of the growing to be power obstacle, Energy potency and Renewable power via Nanotechnology offers finished insurance of state of the art study within the energy-related fields of nanoscience and nanotechnology, which goal to enhance strength potency and the iteration of renewable power.

Energy potency and Renewable strength via Nanotechnology tightly correlates nanotechnology with strength matters in a basic, finished manner that makes it not just compatible as a table reference for study, but in addition as an information source for the non-expert common public.

Readers will locate Energy potency and Renewable power via Nanotechnology worthwhile in various methods, starting from the production of power coverage, to power examine improvement, and to schooling in nanotechnology and its software to energy-related difficulties. it might even be used as a major or supplementary textbook for energy-related classes for complicated undergraduate and graduate students.

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Example text

The Si-NWs have diameters of 100 nm and lengths between 20 and 500 lm, the minorityelectron diffusion length is 100 nm (comparable to the Si-NWs diameters), and the recombination center densities of 7 9 1018 cm-3 in the quasi-neutral region and 1014 cm-3 in the depletion region. 5% and saturates when the thickness is over 450 nm. This study points out the great potential of stand-alone Si-NWs-based solar cells. Here it is noted that the above study does not account for any interaction between the incident light and the studied Si-NWs array (and hence the enhanced light absorption).

41 [64]. However for solar cell applications, as discussed previously, other aspects must also be considered. The effective extraction of photogenerated carriers relies on optimized electrical contacts, which further depend on the conformal deposition of the electrodes on the Si nanostructure. Therefore, the thickness of the Si nanostructure layers is a compromise, also partially owing to the manufacturing concerns. Different from the light multireflection mechanism based on geometrical optics in microscale surface textures for light absorption enhancement, the interaction Enhancement of Si-Based Solar Cell Efficiency Via Nanostructure Integration (a) Top electrode (b) D d 41 Top electrode n + emitter Wn Wp n + layer p-type base (10 16 cm -3) p-type base P p+ layer Back electrode p+ layer (N A = 10 20 cm -3) Back electrode Fig.

42 a Schematic of the Si-NW-textured thin film-based solar cell, and b the unit used for the calculation of the optical and electrical characteristics between the incident light and nanoscale surface textures follows elemental optical processes based on wave optics, such as scattering [30]. , increasing the light absorption. Our group has systematically studied the optical characteristics of Si nanostructure-textured Si thin films, including Si-NWs, Si-NCs and Si-NHs [30, 31, 105, 106]. The results indicate that there is a critical value for the thickness of all the Si nanostructure textures.

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