Abstract
A new technique for multilayer growth by metalorganic chemical vapor deposition is described. The vacuum metalorganic chemical vapor deposition technique combines the low-temperature growth capability of molecular beam epitaxy with the source handling system of chemical vapor deposition. The viability of the new technique is demonstrated by the growth of high-mobility layers of GaAs, GaAs(1−x)P(x), and Ga(1−x)In(x)As at 570 °C. Room-temperature mobilities of GaAs films as high as 4990 cm2/V s are obtained. Doping of both p-type and n-type films is demonstrated. GaAs shallow homojunction solar cells fabricated with this technique are described. Active-area solar cell efficiencies as high as 19.6% are obtained with 6 ’’suns’’ AM2 concentrated light. This multilayer growth technique is particularly suited to the fabrication of multicolor solar cells.