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Silicon solar cells with antireflecting and protective coatings based on diamond-like carbon and silicon carbide films

KLyui N. I., Litovchenko V. G., Kostylyov V. P., Rozhin A. G., Gorbulik V. I., Voronkin M. A., Zaika N. I.

Opto-Electronics Review

2000

Vol. 8, No. 4

406-409

Deposition of single or two-layer diamond like carbon (DLC) antireflecting coatind enables the solar cell (SC) efficiency to be improved 1.35 - 1.45 time. It is interesting to note that the SC efficiency improvement after DLC films deposition is connected not only with the antireflecting effect. The DCL films deposition also results in short circuit current (Jsc) increasing but enhancement of open circuit voltage (Voc) and fill factor (FF) as well. The latter is likely caused by passivation of recombination active centers on the SC surface during DLC film deposition and, possibly, by gettering of the defect and impurities from the SC volume. The improvement in SC' efficiency was also observed for SC covered by thin (50-100 nm) antireflecting SiC coatings.

Nitrogen containing diamond-like carbon films as protective and fluorescent layers for silicon solar cells

Litovchenko V. G., Klyui N. I., Kostylyov V. P., Gorbulik V. I., Piryatinskii Y. P.

Opto-Electronics Review

2000

Vol. 8, No. 4

402-405

Thick (1300-1500 nm) diamond like carbon (DLC) films deposited on a working side of a solar cell (SC) allow us to increase its stability relating to the effect of proton and ultraviolet (UV) irradiation. So, one-stage (E=50 keV) or multi-energy (50+100 keV) implantation of proton into protected SC (the S.C. + DLC films system) did not practically influence SC parameters. Moreover, SC covered by DLC film after UV irradiation shows improvement in efficiency both for implanted and unimplanted samples. At the same time the unprotected SC deteriorated after those treatments. The effects observed are connected with decreasing reflection losses due to deposition of DLC films, re-emission by DLC film of absorbed ultraviolet light in visible spectral range, and self-annealing of radiation damages in implanted DLC films due to light - induced hydrogen bonding. The results obtained have opened up a wide variety of potential applications of DLC films, especially for space solar cells.