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2 2000

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Silicon thin film multijunction solar cells

Kołodziej A., Wroński C. R., Krewniak P., Nowak S.

Opto-Electronics Review

2000

Vol. 8, No. 4

339-345

The multijunction structure properties of the thin film silicon solar cells and the newest achievements are described. The operation, principle of the solar cell, is based on an effective absorption of incident light and a sufficiently long lifetime of photoexcited electrons and holes such that they can become spatially separated. There are compared different technological methods of obtaining the a-Si:H solar cells leading to their optimat optoelectronic properties. It is also shown some ideas on cells manufacturing partially based on special magnetron sputtering process.

Recent advances in understanding of a-Si:H based materials and performance of their solar cells

Wroński C. R., Jiao L., Koval R., Collons R. W.

Opto-Electronics Review

2000

Vol. 8, No. 4

275-279

A brief review is presented of some recent results which shed new light on the nature of gap states and the microstructure of high quality a-Si:H materials which can be directly related to improved performance and stability of their solar cells. These results demonstrate that charged, and not just the neutral dangling bond D°, defects have to be included in assessing the quality and stability of a-Si:H for solar cells. It is also shown that the commonly used measurements and their interpretation, solely in terms of neutral dangling bonds and their densities, are inadequate and measurements are discussed which allow the contributions of charged defect states to be evaluated. Recent results are also presented and discussed in which the effects of hydrogen dilution on the growth and microstructure of a-Si:H materials have been characterised using real-time spectroscopic ellipsometry. Guided by the derived deposition phase diagram for these materials, systematic studies could be carried out on p-i-n solar cell structures which have provided insights into the properties of these materials and a systematic approach for improving performance and stability of their solar cells.