Colloidal Nanocrystals Regrowth‐Assisted Synthesis of Perovskite Microwire Lasers For Integrated Optoelectronics
Elizaveta V. Sapozhnikova, Ivan A. Matchenya, Dmitry A. Tatarinov, Grigorii A. Verkhogliadov, Dmitry A. Semyonov, Maria A. Kirsanova, Natalia K. Kuzmenko, Julia S. Mironova, Arina O. Kalganova, Valeriya M. Levkovskaya, Stepan A. Baryshev, Yuxi Tian, Anatoly P. PushkarevABSTRACT
Colloidal perovskite nanocrystals (NCs) are a well‐proven platform for growing anisotropic structures. Nanowires (NWs) exhibiting a quantum confinement phenomenon and microwires (MWs), which enable lasing, are of particular interest for optoelectronic devices. Synthesis of the latter is challenging. Herein, we report a straightforward access to high‐quality MW lasers. We utilize a diphenyl ether (DPE) solvent for the hot‐injection synthesis. DPE coordinates strongly to and allows to reduce an excess of oleic acid/oleylamine ligand pair, well‐established for dissolution and inhibition of as‐formed NCs regrowth. Therefore, a rapid injection of Cs‐oleate into the ‐containing solution yields lead‐depleted NCs, which gradually convert into counterparts. The latter transform into NWs through an oriented‐attachment mechanism, which in turn evolve into laser MWs. To demonstrate spectrally tunable lasing in MWs we employ for ion exchange in the perovskite lattice. Resultant CsPb(Cl,Br) MWs show high‐Q coherent emission in the 485–540 nm range. To highlight the potential of synthesized MWs for integrated optoelectronics, we assemble a device comprising a CsPb(Cl,Br) MW laser coupled to lossless nanowaveguide, which delivers coherent light to a MW photodetector. The device exhibits a nonlinear optoelectronic response applicable for on‐chip neuromorphic computing.