Room-temperature chemistry brings perovskite nanocrystals into continuous flow
A single peer-reviewed materials study used octanoic acid to trigger perovskite nanocrystal formation at room temperature. Automated experiments and machine learning helped tune crystal size, and the chemistry also worked in a continuous-flow setup. The development addresses synthesis conditions for solar-cell materials; the reported device results remain measurements from the researchers’ laboratory system.
Science··Midday
Crystals form without hot injection
A single peer-reviewed materials experiment developed room-temperature synthesis for perovskite nanocrystals, tiny crystals investigated for solar cells. Adding short-chain octanoic acid altered the reactivity of the starting chemicals and initiated crystal formation. The researchers used formamidinium lead iodide, a light-absorbing material, to test an alternative to conventional hot injection, which can require high temperatures and long-chain molecules on crystal surfaces.[1]
Automated experiments tune crystal size
Data from automated synthesis experiments fed machine-learning models that helped choose the ratio of octanoic acid to formamidinium acetate. Changing this feed ratio allowed the team to tune the nanocrystals’ size and size distribution. The learning system supported selection of chemical conditions within this study. It was part of the materials experiment, whose reported development is a synthesis route rather than a new general-purpose learning algorithm.[1]
The chemistry also works in continuous flow
The same room-temperature approach was adapted to continuous-flow synthesis, where reactions proceed through small channels. A photovoltaic device made with the resulting nanocrystals reached an efficiency of 19.37 per cent in converting light into electricity, according to the team. That measures sunlight converted into electricity in the laboratory cell. The result belongs to the team’s materials and device conditions; it does not establish long-term field performance or independently verified factory-scale production costs.[1]
