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

TL;DR

This paper presents a simple, catalyst-free method for growing high-quality, morphology-controlled 2D perovskite nanowires with highly polarized photoluminescence and photodetection capabilities, advancing optoelectronic device applications.

Contribution

It introduces a scalable, catalyst-free growth technique for 2D perovskite nanowires with controlled morphology and demonstrates their superior polarized light detection performance.

Findings

Achieved highly polarized photoluminescence with a ratio of ~0.73.

Demonstrated polarization-sensitive photocurrent with an anisotropy ratio of ~3.62.

Provided a scalable method for high-quality 2D perovskite nanowire fabrication.

Abstract

Two-dimensional (2D) perovskites or Ruddleson Popper (RP) perovskites have emerged as a class of material inheriting the superior optoelectronic properties of two different materials: perovskites and 2D materials. The large exciton binding energy and natural quantum well structure of 2D perovskite not only make these materials ideal platforms to study light-matter interactions, but also render them suitable for fabrication of various functional optoelectronic devices. Nanoscale structuring and morphology control have led to semiconductors with enhanced functionalities. For example, nanowires of semiconducting materials have been extensively used for important applications like lasing and sensing. Catalyst-assisted Vapor Liquid Solid (VLS) techniques, and template assisted growth, have conventionally been used for nanowire growth. However, catalyst and template-free scalable growth with morphology control of 2D perovskites have remained elusive. In this manuscript, we demonstrate a facile approach for morphology-controlled growth of high-quality nanowires of 2D perovskite, (BA)2PbI4. We demonstrate that the photoluminescence (PL) from the nanowires are highly polarized with a polarization ratio as large as ~ 0.73, which is one of the largest reported for perovskites. We further show that the photocurrent from the device based on the nanowire/graphene heterostructure is also sensitive to the polarization of the incident light with the photocurrent anisotropy ratio of ~3.62 (much larger than the previously reported best value of 2.68 for perovskite nanowires), thus demonstrating the potential of these nanowires as highly efficient photodetectors of polarized light.