Piezoelectric‐Effect Enhanced Perovskite Plasmonic Nanolasers

Abstract Herein, the piezoelectric effect of CsPbBr₃ perovskite is utilized for the first time to enhance the nanolasers performance based on the flexible poly(ethylenenaphthalate) PEN/single‐crystal‐Au/MgF₂/CsPbBr₃ (ScAu/M/CPB) structure. The dynamic‐modulated plasmonic lasing mode blueshift is achieved by the piezoelectric polarization effect (PPE)‐induced effective refractive index (n_eff) change by varying the applied strain (ε). In particular, taking advantage of the increased cavity mode frequency, the lasing threshold (P_th) reduces from 4.5 µJ cm⁻² (ε = 0) to 1.5 µJ cm⁻² (ε = −1.02%). The ε‐dependent carrier dynamics results reveal the nature of ultralow P_th being PPE‐induced spontaneous emission (SE) decay rate enhancement, leading to the reduction in radiation loss of the plasmonic cavity. The corresponding enhancement mechanism is put forward to elucidate the principle of piezoelectric‐induced dynamic modulation nanolasers characteristic. This work demonstrates that coupling of piezoelectric effect and plasmonics is an effective route to enhance the performance of plasmonic nanolasers.