Direct-bandgap spinel-type sulfide semiconductors overcome efficiency limitations for solar-cell absorbers and green-LED sources

https://www.eurekalert.org/news-releases/1100721

"exhibits direct bandgap/ emits light from orange to blue at room temperature, composition can be chemically tuned to switch between n-type/ p-type conduction over 9 orders magnitude... undoped produces strong orange emission, magnesium in place of zinc shifts to green or blue depending on amount of substitution... switches to n-type (by introducing small amount titanium at Sc3+ site) or p-type (by slightly reducing zinc content) conduction... pn homojunction devices”

Related: A trick of light: UC Irvine researchers turn silicon into direct bandgap semiconductor
https://news.uci.edu/2024/10/31/a-trick-of-light-uc-irvine-researchers-turn-silicon-into-direct-bandgap-semiconductor/