This TIL refers to the KidWind 2V/400mA Solar Panel (KW-SP2V).

For panels made before April of 2019:

According to the attached specification sheet, the Solar cell type is: Polycrystalline PET
This is a laminate of plastics and polycrystalline silicon solar cells.

The spec sheet indicates the solar cells are from Lithuania, but the manufacturer has also communicated to us that they may also source solar cells from Malaysia.

For panels made after April of 2019:

We changed suppliers of our solar panels in April of 2019. The newer style has wires molded into the back panel, and no longer has visible posts. These are panelized for Vernier in California, and the cells may be sourced from a variety of countries.