Emerging photoluminescence in monolayer MoS2.
Novel physical phenomena can emerge in low-dimensional nanomaterials. Bulk MoS(2), a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS(2) crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system. This observation shows that quantum confinement in layered d-electron materials like MoS(2) provides new opportunities for engineering the electronic structure of matter at the nanoscale.
Physics Department, University of California at Berkeley, Berkeley, California 94720, USA.
Andrea
A
Splendiani
Liang
L
Sun
Yuanbo
Y
Zhang
Tianshu
T
Li
Jonghwan
J
Kim
Chi-Yung
CY
Chim
Giulia
G
Galli
Feng
F
Wang