Search query: chiral perovskite nano

Related papers:

abstract: Hybrid organic inorganic perovskites allow the synthesis of high quality, nanostructured semiconducting films via easily accessible solution based techniques. This has allowed tremendous development in optoelectronic applications, primarily solar cells and light emitting diodes. Allowed by the ease of access to nanostructure, chirality has recently been introduced in semiconducting perovskites, as a promising way to obtain advanced control of charge and spin and for developing circularly polarized light sources. Circular polarization of photo luminescence (CPL) is a powerful tool to probe the electronic structure of materials. However, CPL in chiral perovskites has been scarcely investigated, and a study in bulk thin films and at room temperature is still missing. In this work we fabricate bromine based chiral perovskites by using a bulky chiral organic cation mixed with CsBr, resulting in Ruddlesden Popper perovskite thin films. We measure CPL on these films at room temperature and, by using unpolarized photo excitation, we record a degree of circular polarization of photo luminescence in the order of 10 3 and provide a full spectral characterization of CPL. Our results show that chirality is imparted on the electronic structure of the semiconductor; we hypothesize that the excess in polarization of emitted light originates from the charge in the photo generated Wannier exciton describing an orbit in a symmetry broken environment. Furthermore, our experiments allow to directly measure the magnetic dipole moment of the optical transition, which we estimate to be 0.1 mB. Finally, we discuss the implications of our findings on the development of chiral semiconducting perovskites as sources of circularly polarized light.
author_names: Daniele Di Nuzzo

Linsong Cui

Jake L Greenfield

Baodan Zhao

Richard H Friend

Stefan C J Meskers
title: Circularly Polarized Photo Luminescence from Chiral Perovskite Thin Films at Room Temperature.
venue: ACS nano
year: 2020

abstract: Monolayer two dimensional (2D) transition metal dichalcogenides (TMDs) have attracted great interest in spintronics and valleytronics due to the spin valley locking effect. To efficiently control and manipulate the valley pseudospin is of paramount importance for valley based electronics and optoelectronics. A variety of strategies have been developed to address the valley pseudospin including optical, electrical, and magnetic methods; nonetheless, they involve either below liquid nitrogen temperature or an external magnetic field, which increases the cost and complexity of the devices. Here, we report a straightforward way to manipulate valley polarization in monolayer TMDs via selective spin injection in chiral 2D perovskite/monolayer TMD (e.g. MoS2 and WSe2) van der Waals heterostructures without requiring an external magnetic field or specially designed device structures. We show the dangling bond free vdW interface can allow an impressive average spin injection efficiency of 78% to produce persistent valley polarization in monolayer MoS2 (WSe2) over 10% from liquid nitrogen temperature to above 200 K. We attribute the valley polarization of monolayer MoS2 (WSe2) to selective spin injection from chiral 2D perovskites, which can effectively introduce population imbalance between valleys in monolayer MoS2 (WSe2) Our findings provide an alternative strategy to manipulate the valley polarization in TMDs without requiring circularly polarized light excitation, below liquid nitrogen temperature, or external magnetic field, and thus would promote the development of perovskite based spintronic and valleytronic devices.
author_names: Yingying Chen

Jiaqi Ma

Zeyi Liu

Junze Li

Xiangfeng Duan

Dehui Li
title: Manipulation of Valley Pseudospin by Selective Spin Injection in Chiral Two Dimensional Perovskite/Monolayer Transition Metal Dichalcogenide Heterostructures.
venue: ACS nano
year: 2020

abstract: Hybrid organic/inorganic lead halide perovskites (LHPs) have recently emerged as extremely promising photonic materials. However, the exploration of their optical nonlinearities has been mainly focused on the third and higher order nonlinear optical (NLO) effects. Strong second order NLO responses are hardly expected from ordinary LHPs due to their intrinsic centrosymmetric structures, but are highly desirable for advancing their applications in the next generation integrated photonic circuits. Here we demonstrate the fabrication of a novel noncentrosymmetric LHP material by introducing chiral amines as the organic component. The nanowires grown from this new LHP material crystallize in a noncentrosymmetric P1 space group and demonstrate highly efficient second harmonic generation (SHG) with high polarization ratios and chiroptical NLO effects. Such a chiral perovskite skeleton could provide a new platform for future engineering of optoelectronic functionalities of hybrid perovskite materials.
author_names: Chunqing Yuan

Xinyue Li

Sergey Semin

Ya-qing Feng

Th Rasing

Jialiang Xu
title: Chiral Lead Halide Perovskite Nanowires for Second Order Nonlinear Optics.
venue: Nano letters
year: 2018

abstract: The recent convergence of chiral molecules with metal halide perovskite frameworks gives rise to an interesting family of chiral systems: two dimensional, chiral hybrid organic inorganic perovskites (chiral HOIPs) While possessing photovoltaic properties of traditional HOIPs, this class of materials is endowed with chirality through its organic ligands in which the degeneracy of the electron spin in charge transport is broken, i.e. the Chirality Induced Spin Selectivity (CISS) effect manifests, making it a promising platform to bridge opto spintronic studies and the CISS effect. In this work chiral HOIP/NiFe heterostructures are studied by means of the magneto optical Kerr effect using a Sagnac interferometer. Upon illumination of the chiral HOIPs, the Kerr signal at the chiral HOIP NiFe interface changes and a linear dependence of the response on the magnetic field is observed. The sign of the slope was found to depend on the chirality of the HOIPs. The results demonstrate the utility of chiral HOIP materials for chiral opto spintronic applications.
author_names: Zhengjie Huang

Brian P Bloom

Xiaojuan Ni

Zheni N Georgieva

Melissa Marciesky

Eric Vetter

Feng Liu

David H Waldeck

Dali Sun
title: Magneto Optical Detection of Photoinduced Magnetism via Chirality Induced Spin Selectivity in 2D Chiral Hybrid Organic Inorganic Perovskites.
venue: ACS nano
year: 2020

abstract: Perovskite nanocrystals (PCNs) exhibited excellent absorption and luminescent optical properties. Inorganic silica nanohelices are used as chiral templates to induce optically active properties to CsPbBr3 PNCs grafted on their surfaces. In suspension, PNCs synthesized and grafted on the right (or left) handed silica helices do not show any detectable chiroptical properties. In contrast, in a dried film state, they show large circular dichroism (CD) and circularly polarized luminescence (CPL) signals with dissymmetric factor up to 6*10 3. Grazing incidence X ray scattering, tomography electron microscopy (EM) and cryo EM have shown closely and helically packed PNCs if the nanohelices@PNCs are dried in contrast to much more loosely organized PNCs solvated in suspension. Simulations based on the coupled dipole method (CDM) demonstrate that the CD comes from the dipolar interaction between PNC assembled into a chiral structure. We show that the CD decreases as the interparticle distance increases. These results indicate that closely packed and helically arranged PNCs on silica nanohelices result in an increase of the optically active properties in the film state.
author_names: Peizhao Liu

Weidong Chen

Yutaka Okazaki

Yann Battie

Lysiane Brocard

Marion Decossas

Emilie Pouget

Peter Muller-Buschbaum

Brice Kauffmann

Shaheen H Pathan

Takashi Sagawa

Reiko Oda
title: Optically Active Perovskite CsPbBr3 Nanocrystals Helically Arranged on Inorganic Silica Nanohelices.
venue: Nano letters
year: 2020

abstract: Colloidal metal halide perovskite nanocrystals (NCs) with chiral ligands are outstanding candidates as a circularly polarized luminescence (CPL) light source due to many advantages such as high photoluminescence quantum efficiency, large spin orbit coupling, and extensive tunability via composition and choice of organic ligands. However, achieving pronounced and controllable polarized light emission remains challenging. Here, we develop strategies to achieve high CPL responses from colloidal formamidinium lead bromide (FAPbBr3) NCs at room temperature using chiral surface ligands. First, we show that replacing a portion of typical ligands (oleylamine) with short chiral ligands (R) 2 octylamine) during FAPbBr3 NC synthesis results in small and monodisperse NCs which yield high CPL with average luminescence dissymmetry g factor, glum 6.8 x 10 2. To the best of our knowledge, this is the highest among reported perovskite materials at room temperature to date and represents around 10 fold improvement over the previously reported colloidal CsPbClxBryI3 x y NCs. In order to incorporate NCs into any optoelectronic or spintronic application, the NCs necessitate purification which removes a substantial amount of the chiral ligands and extinguishes the CPL signals. To circumvent this issue, we also developed a post synthetic ligand treatment using a different chiral ligand, (R /S )methylbenzylammonium bromide, which also induces a CPL with an average glum 1.18 x 10 2. This post synthetic method is also amenable for long range charge transport since methylbenzylammonium is quite compact in relation to other surface ligands. Our demonstrations of high CPL and glum from both as synthesized and purified perovskite NCs at room temperature suggest a route to demonstrate colloidal NC based spintronics.
author_names: Young-Hoon Kim

Yaxin Zhai

E Ashley Gaulding

Severin N Habisreutinger

Taylor Moot

Bryan A Rosales

Haipeng Lu

Abhijit Hazarika

Roman Brunecky

Lance M Wheeler

Joseph J Berry

Matthew C Beard

Joseph M Luther
title: Strategies to Achieve High Circularly Polarized Luminescence from Colloidal Organic Inorganic Hybrid Perovskite Nanocrystals.
venue: ACS nano
year: 2020

abstract: Micro and nanolasers are miniaturized light sources with great potential in optical imaging, sensing, and communication. While various micro and nanolasers have been synthesized, they are mostly linearly polarized and thus strongly restricted in many new applications, e.g. chiral resolution in synthetic chemistry, cancerous tissue imaging, information storage, and processing. Herein, we experimentally demonstrate the circularly polarized surface emitting perovskite lasers by integrating the as grown perovskite microcrystals with an all dielectric metalens. The perovskite microcrystal serves as an optical microcavity and produces linearly polarized laser emission, which is collected by a geometric phase based TiO2 metalens. The left handed circularly polarized components are collimated by the metalens into a directional laser beam with a divergent angle of <0.9deg, whereas the right handed components are strongly diverged by the same metalens. Consequently, the right handed circularly polarized components are filtered out, and perovskite lasers with high directionality and pure circular polarization have been experimentally realized.
author_names: Wei Dai

Yujie Wang

Ruixue Li

Yubin Fan

Geyang Qu

Yunkai Wu

Qinghai Song

Jiecai Han

Shumin Xiao
title: Achieving Circularly Polarized Surface Emitting Perovskite Microlasers with All Dielectric Metasurfaces.
venue: ACS nano
year: 2020

abstract: Low dimensional lead halide perovskite materials are an emerging class of solution processable semiconductors with promising potential applications in optoelectronic devices. Unfortunately, it is impossible to synthesize high crystalline quality low dimensional perovskite single crystals without using chemotoxicity solution such as dimethylformamide (DMF)/dimethyl sulfoxide (DMSO) or applying heating. Herein we report an economical and universal aqueous method to synthesize 2D layered and 1D chained perovskite single crystals at room temperature. The resultant chiral 2D perovskites can efficiently and selectively emit and detect circularly polarized light at room temperature. The as synthesized 1D perovskite single crystals exhibit strong quantum confinement and enhanced self trapped states that give efficient warm circularly polarized white light emission. This aqueous synthetic method is general for other high quality low dimensional lead halide perovskite single crystals and thus our findings would motivate more fundamental investigations on low dimensional perovskites for potential optoelectronic applications.
author_names: Jinye Wang

Chen Fang

Jiaqi Ma

Shuaihao Wang

Long Jin

Wancai Li

De-Hui Li
title: Aqueous Synthesis of Low Dimensional Lead Halide Perovskites for Room Temperature Circularly Polarized Light Emission and Detection.
venue: ACS nano
year: 2019

abstract: Hybrid organic inorganic perovskites (HOIPs) offer long carrier diffusion lengths, high absorption coefficients, tunable band gaps and long spin lifetimes. The flexible crystal structure and ionic nature of HOIPs make it possible to allow tuning of their material properties through rational design, including the incorporation of chiral organic ligands. Recently, chiral HOIPs have emerged as promising materials for chiroptoelectronics, spintronics and ferroelectrics. They exhibit high photoluminescence polarization (17% without an external magnetic field) good device performance (a circularly polarized photodetector had 100 times higher responsivity than one based on a chiral metasurface) and high saturated polarization ~2 times higher than that of barium titanate) Here, we review the latest advances in chiral HOIPs and investigate the specific benefits of combining chiral organic and inorganic components in perovskites. We discuss demonstrations of chiroptical and ferroelectric applications, and conclude with our perspective on the future opportunities for chiral HOIPs. Chiral hybrid organic inorganic perovskites combine the remarkable optical, electrical and spintronic properties of perovskites with chirality. This Review systematically introduces the latest advances in chiral perovskites, surveys their structure property relationships and details their chiroptical and ferroelectric applications.
author_names: Guankui Long

Randy P Sabatini

Makhsud I Saidaminov

Girish Lakhwani

Abdullah Rasmita

Xiaogang Liu

Edward H Sargent

Wei-bo Gao
title: Chiral perovskite optoelectronics
venue: Nature Reviews Materials
year: 2020

abstract: New fashioned bismuth silver oxide (BSO) perovskite nano catalysts have been synthesized by a simple and easy co deposition method, with silver nitrate and bismuth acid sodium as raw materials. Photocatalytic degradation characteristics of tetracycline under UV irradiation and structural transformation on BSO have been studied systematically. The degradation conditions were optimized by single factor experiment and orthogonal experiment. The results show that the highest degradation rate can reach 95.79% and the first order reaction rate coefficient k 0.0361 min 1 During the recycle photocatalytic process, the material structural transformation (BSO is gradually transformed into highly active Bi 2 O 2 CO 3 after multiple degradation) of the catalyst has been systematically studied.
author_names: Jianmin Zhou

Meiqing Yu

Jiayi Peng

Ronghao Lin

Zesheng Li

Changling Yu
title: Photocatalytic degradation characteristics of tetracycline and structural transformation on bismuth silver oxide perovskite nano catalysts
venue: Applied Nanoscience
year: 2020