NREL creates highest efficiency 1-sun solar cell

https://www.nrel.gov/news/press/2022/nrel-creates-highest-efficiency-1-sun-solar-cell.html

"quantum wells in middle layer extend bandgap GaAs cell and increase amount light that cell absorb... optically thick quantum well devices without major voltage loss... anneal GaInP top cell during growth process... drastically reducing cost of III-V cells... communications satellites... 34.2% for a beginning-of-life measurement. The present design of the cell is suitable for low-radiation environments, and higher-radiation applications may be enabled by further development of the cell structure"