NEWSROOM

Researchers at Science Tokyo have shown that the circular photogalvanic effect in two-dimensional organic-inorganic hybrid perovskites arises from the crystal bulk rather than its surface. Using circularly polarized light at normal incidence, they found helicity-dependent photocurrents that reversed with light handedness and with crystal polarity in chiral enantiomers. The lead iodide layers provide strong spin-orbit coupling while molecular cations set bulk polarity.