  Metal-halide perovskites are a class of solution processed materials with
remarkable optoelectronic properties such as high photoluminescence quantum
yields and long carrier lifetimes, which makes them promising for a wide range
of efficient photonic devices. In this work, we demonstrate the first
successful integration of a perovskite laser onto a silicon nitride photonic
chip. High throughput, low cost optical lithography is used followed by
indirect structuring of the perovskite waveguide. We embed methylammonium lead
tri-iodide (MAPbI3) in a pre-patterned race-track microresonator and couple the
emitted light to an integrated photonic waveguide. We clearly observe the
build-up of spectrally narrow lasing modes at room temperature upon a pump
threshold fluence of $19.6 \mu Jcm^{-2}$. Our results evidence the possibility
of on-chip lasers based on metal-halide perovskites with industry relevance on
a commercially available dielectric photonic platform, which is a step forward
towards low-cost integrated photonic devices.
