Flexible and Semi‐Transparent Ultra‐Thin CIGSe Solar Cells
For applications to semi-transparent and/or bifacial solar cells in building-integrated photovoltaics and building-applied photovoltaics, studies are underway to reduce the processing cost and time by decreasing the thickness of Cu(In 1− x,Ga x)Se 2 (CIGSe) absorber to the ultra-thin scale (≤500 nm). To dynamically and affordably meet the growing demand for electric power,