Engineering topics

Morrison, A. D.

Publications and source records attributed to Morrison, A. D..

21 records · Page 2

NASA NTRS1975

Low cost silicon solar arrays

Continuous growth methodology for silicon solar cell ribbons deals with capillary effects, die effects, thermal effects and crystal shape effects. Emphasis centers on the shape of the meniscus at the ribbon edge as a factor contributing to ribbon quality with respect to defect densities. Structural and electrical characteristics of edge defined, film-fed grown silicon ribbons are elaborated. Ribbon crystal solar cells produce AMO efficiencies of 6 to 10%.

Ravi, K. V.↗

NASA NTRS1975

Edge-defined film-fed growth of beta-alumina and Mg-substituted beta-alumina

High Na vapor pressure, peritectic decomposition, and high reactivity of the melt complicate the growth of beta-alumina crystals. These difficulties were overcome by using a high-pressure (300 psig) growth chamber, Na2O-rich melts, and Ir for all surfaces in contact with the melt. These procedures were combined with the edge-defined film-fed growth technique to produce single-crystal beta-alumina tubes and ribbons.

Morrison, A. D.↗

NASA NTRS1975

EFG silicon ribbon solar cells

The growth and characteristics of edge defined, film fed grown (EFG) silicon ribbons are discussed. Factors involved in the growth of continuous lengths of 1 in. wide ribbons are examined. The structural and electrical characteristics of the ribbons have been studied and the results are presented. Solar cells have been fabricated using the ribbon crystals and typical AMO efficiencies of 6 to 10% have been realized.

Ravi, K. V.↗