Ultrathin photovoltaic silicon membrane with 65% light absorption

https://www.pv-magazine.com/2022/03/30/ultrathin-photovoltaic-silicon-membrane-with-65-light-absorption/

"theoretically able to achieve an absorption equivalent photocurrent of 26.3mA/cm2... can potentially be increased up to 33.8mA/cm2 by incorporating a back-reflector and improved anti-reflection, for which we estimate a photovoltaic efficiency above 21% for 1μm-thick Si cells... This means that thin Si cells with high efficiency could also be made from lower grade silicon, thereby reducing the energy needs for raw Si purification and reducing their energy pay-back time"