Visible-light-emitting diodes based on laser-grooved Si have been fabr
icated, using semitransparent top metal contacts. The visible electrol
uminescence occurs with the top metal contact negative with respect to
the bulk material. Its efficiency, spectrum and good durability are s
imilar to those from spark-processed Si, with the internal efficiency
up to 10(-2)%. The technique has potential for applications.