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Two-dimensional (2D) perovskites or Ruddleson Popper (RP) perovskites haveemerged as a class of material inheriting the superior optoelectronicproperties of two different materials: perovskites and 2D materials. The largeexciton binding energy and natural quantum well structure of 2D perovskite notonly make these materials ideal platforms to study light-matter interactions,but also render them suitable for fabrication of various functionaloptoelectronic devices. Nanoscale structuring and morphology control have ledto semiconductors with enhanced functionalities. For example, nanowires ofsemiconducting materials have been extensively used for important applicationslike lasing and sensing. Catalyst-assisted Vapor Liquid Solid (VLS) techniques,and template assisted growth, have conventionally been used for nanowiregrowth. However, catalyst and template-free scalable growth with morphologycontrol of 2D perovskites have remained elusive. In this manuscript, wedemonstrate a facile approach for morphology-controlled growth of high-qualitynanowires of 2D perovskite, (BA)2PbI4. We demonstrate that thephotoluminescence (PL) from the nanowires are highly polarized with apolarization ratio as large as ~ 0.73, which is one of the largest reported forperovskites. We further show that the photocurrent from the device based on thenanowire/graphene heterostructure is also sensitive to the polarization of theincident light with the photocurrent anisotropy ratio of ~3.62 (much largerthan the previously reported best value of 2.68 for perovskite nanowires), thusdemonstrating the potential of these nanowires as highly efficientphotodetectors of polarized light.

Catalyst-Free And Morphology-Controlled Growth Of 2D Perovskite Nanowires for Polarized Light Detection