Key points are not available for this paper at this time.
A technique is described by which light entering a thin film is ``trapped'' in the sense of having to traverse the film a number of times. It is shown that the use of this technique in silicon provides a solar cell with good carrier collection efficiencies even with Si only ∼2 μm thick and with ∼10-nsec lifetime.
David Redfield (Sun,) studied this question.