Phys.org October 11, 2024
Layered hybrid perovskites (LHPs) have emerged as promising reduced-dimensional semiconductors for next-generation photonic and energy applications where controlling the size, orientation, and distribution of quantum wells (QWs) is of paramount importance. A team of researchers in the US (North Carolina State University, Brookhaven National Laboratory) revealed that bulky molecular spacers act as crystal-terminating ligands to form colloidal nanoplatelets (NPLs) during early stages of LHP formation. They proved that NPLs ripen and grow, playing a decisive role in the time evolution of QW size, population distribution, and orientation. They demonstrated that antisolvent drip interrupts NPL ripening and controls QW orientation, population, and energy cascades within LHP films. Synthesized NPLs in the antisolvent step of 3D perovskites-controlled facet orientation and achieved enhanced efficiency and stability in wide-bandgap solar-cell devices compared to untextured controls… read more. TECHNICAL ARTICLE
Graphical abstract. Credit: Matter, October 11, 2024