In article number 1800189, Hongbing Fu, Shumin Xiao, Qinghai Song, and co‐workers demonstrate high control over the lasing actions for perovskite nanosheets on a Si3N4 substrate. The cover highlights the laser actions of perovskite nanosheets covered on a Si3N4 disk in the central part. Combined with the mature CMOS technique, this demonstration shows the potential for perovskite nanosheets/Si3N4 disk configuration as on‐chip light source. A technical path to guide the laser emission is shown, consisting of S3N4 waveguides and hybrid circle disks.
