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.
Splendiani
Andrea
A
Physics Department, University of California at Berkeley, Berkeley, California 94720, USA.
Sun
Liang
L
Zhang
Yuanbo
Y
Li
Tianshu
T
Kim
Jonghwan
J
Chim
Chi-Yung
CY
Galli
Giulia
G
Wang
Feng
F