Ribbon crystal end string with multiple individual strings

1. A ribbon crystal comprising:

a body having a thickness dimension; and

end string within the body, at least one end string formed from at least two individual strings spaced apart generally along the thickness dimension of the body and generally forming an elongated, concave cross-sectional shape.

2. The ribbon crystal as defined by claim 1 further comprising body material between the at least two individual strings.

3. A ribbon crystal comprising:

a body; and

a plurality of end strings within the body, at least one end string comprising a pair of spaced apart individual strings; and

body material between the pair of individual strings; wherein

the at least one end string has a generally concave cross-sectional shape.

4. The ribbon crystal as defined by claim 3 wherein the body material comprises silicon.

5. The ribbon crystal as defined by claim 3 wherein the individual strings each generally form an elongated cross-sectional shape.

6. The ribbon crystal as defined by claim 3 wherein the body forms a width dimension, at least one of the individual strings having a concavity that is generally symmetrical about the width dimension.

7. The ribbon crystal as defined by claim 3 wherein at least two end strings each have a pair of spaced apart individual strings, body material being between the individual strings of the two end strings.

8. The ribbon crystal as defined by claim 3 wherein the body has a thickness dimension, the individual strings of the at least one end string being spaced generally along the thickness dimension of the body.