Scholarly record
OPTICAL PROPERTIES OF HYDROGENATED AMORPHOUS THINS FILMS FOR SOLAR CELLS
Abstract
Infrared (IR) absorption spectra are investigated hydrogenated amorphous solid solution films a-Si1-xGex: H (x = 0 - 1) plasma chemical vapor deposition at different partial pressures of hydrogen PH2. Defined force, oscillator, which essentially depended on PH2. It is shown that the hydrogen contained in films mostly in the forms of GeH, SiH. Using integrated acquisitions JW, determined the amount of hydrogen in the films. Film properties depend on the composition and level of hydrogenation. The number of hydrogen atoms in films, varied by changing the composition of the gas mixture. In the work measured IR absorption for films a-Si1-xGex:H, a-Ge:H and a-Si0,88Ge0, 12: H based on films and a-Si: H and a-Si0,88Ge0, 12: H fabricated three-layer solar cells with an area of item 1.3 cm2 and efficiency equal to ~ 9.5%. The IR absorption spectra of films of alloys a-nk-Si: H (a-amorphous, nk-nano-crystalline) in the energy range of 0.03 - 3.0 eV are investigated. The optical absorption coefficients (a) of films are determined for weakly and strongly absorbing spectral regions, and the refractive indices (n) and attenuation coefficients (k0) are determined for various transparent and nontransparent substrates.
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