Increasing potential of silicon clathrate films for photovoltaics

https://www.pv-magazine.com/2024/09/11/increasing-potential-of-silicon-clathrate-films-for-photovoltaics/

"Type II silicon clathrate bandgap is direct, energy about 1.8 eV, ideal for silicon tandem solar cells... excellent film quality due to thermal press annealing process enables Atomic Force Microscopy image recording on silicon clathrate films... silicon clathrates have silicon cages with removable sodium atom inside... chemical treatment with iodine.enables film with much less Na, enhancing semiconductor/ PV properties... prototype p-n heterojunction devices with metal oxides based on silicon clathrate films"