Search query: Bi organic- inorganic 2D perovskite single crystal

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abstract: Characterizing basic material properties, especially mechanical properties, is the prerequisite for building reliable and durable devices. As a promising semiconductor material, two dimensional (2D) organic inorganic hybrid perovskites possess outstanding optical and electrical properties and have attracted significant interest for their wide energy applications. Therefore, a basic mechanical property study of 2D perovskite material will both improve the understanding of atomic layer dependent property change and guide next generation novel device designs. Here, we report a direct shear modulus characterization of 2D organic inorganic hybrid (C4H9NH3)2PbBr4 perovskites in the <001> direction by atomic force microscopy. The measured shear modulus of the 2D perovskite increases significantly with the decrease of the atomic layers, especially as the layer number is less than 60. A composite sandwich model to the free surface contractions of the molecular interaction length is built to reveal this abnormal at.
author_names: Qikun Li

Sheng Bi

Jingyuan Bu

Chaolong Tang

Zhongliang Ouyang

Chengming Jiang

Jinhui Song
title: Atomic Layer Dependence of Shear Modulus in a Two Dimensional Single Crystal Organic Inorganic Hybrid Perovskite
venue: The Journal of Physical Chemistry C
year: 2019

abstract: Two dimensional (2D) layered hybrid perovskites provide an ideal platform for studying the properties of excitons. Here, we report on a strong triplet exciton and longitudinal optical (LO) phonon coupling in 2D (C6H5CH2CH2NH3, PEA)2PbBr4 perovskites. The triplet excitons exhibit strong photoluminescence (PL) in thick perovskite microflakes, and the PL is not detectable for monolayer microflakes. The coupling strength of the triplet exciton LO phonon is approximately two to three times greater than that of the singlet exciton LO phonon with a LO phonon energy of about 21 meV. This difference might due to the different locations of singlet excitons located in the well and triplet excitons located in the barrier in the 2D layered perovskite. Revealing the strong coupling of triplet exciton LO phonon provides a fundamental understanding of many body interaction in hybrid perovskites, which is useful to develop and optimize the optoelectronic devices based on 2D perovskites in the future.
author_names: Yunuan Wang

Feilong Song

Yu Yuan

Jianchen Dang

Xin Xie

Sibai Sun

Sai Yan

Yanbing Hou

Zhidong Lou

Xiulai Xu
title: Strong Triplet Exciton LO Phonon Coupling in Two Dimensional Layered Organic Inorganic Hybrid Perovskite Single Crystal Microflakes.
venue: The journal of physical chemistry letters
year: 2021

abstract: 3D organic inorganic hybrid halide perovskites have attracted great interest due to their impressive optoelectronic properties. Recently, the emergence of 2D layered hybrid perovskites, with their excellent and tunable optoelectronic behavior, has encouraged researchers to develop the next generation of optoelectronics based on these 2D materials. However, device fabrication methods of scalable patterning on both types of hybrid perovskites are still lacking as these materials are readily damaged by the organic solvents in standard lithographic processes. We conceived the orthogonal processing and patterning method: Chlorobenzene and hexane, which are orthogonal to hybrid perovskites, are utilized in modified electron beam lithography (EBL) processes to fabricate perovskite based devices without compromising their electronic or optical characteristics. As a proof of concept, we used the orthogonal EBL technique to fabricate a 2D layered single crystal (C6H5C2H4NH3)2PbI4 photodetector featuring nanoscale patterned electrodes and superior photodetection ability with responsivity of 5.4 mA/W and detectivity of 1.07 x 1013 cm Hz1/2/W. Such orthogonal processing and patterning methods are believed to fully enable the high resolution, high throughput fabrication of complex perovskite based electronics in the near future.
author_names: Chun-Ho Lin

Bin Cheng

Ting-You Li

Jose Ramon Duran Retamal

Tzu-Chiao Wei

H C Fu

Xiaosheng Fang

Jr-hau He
title: Orthogonal Lithography for Halide Perovskite Optoelectronic Nanodevices.
venue: ACS nano
year: 2019

abstract: Halide double perovskites have recently bloomed as the green candidates for optoelectronic applications, such as X ray detection. Despite great efforts, the exploration of promising organic inorganic hybrid double perovskites toward X ray detection remains a blank. Here, for the first time, we present single crystals of the lead free hybrid double perovskite, (BA) 2 CsAgBiBr 7 (BA is n butylammonium) featuring the unique 2D multilayered quantum confined motif, which enable quite large mt (mobility lifetime) product up to ~1.21 x 10 3 cm 2 V 1 This figure of merit realized in 2D hybrid double perovskites is unprecedented and comparable with that of CH 3 NH 3 PbI 3 wafers. Further, (BA) 2 CsAgBiBr 7 crystals also exhibit other intriguing attributes for X ray detection, including high bulk resistivity, low density of defects and traps, and large X ray attenuation coefficient. Consequently, vertical structure crystal device under X ray source yields a superior sensitivity of 4.2 mC Gy air 1 cm 2 This work suggests great potentials of 2D hybrid double perovskites as candidate toward X ray detection, and knocks the door for their future optoelectronic device applications.
author_names: Xitao Liu

Yadong Xu
title: Exploring Lead free Hybrid Double Perovskite Crystals of (BA)2CsAgBiBr7 with Large Mobility Lifetime Product toward X ray Detection.
venue: Angewandte Chemie
year: 2019

abstract: Two dimensional (2D) organic inorganic hybrid perovskites is promising for next generation optoelectronic materials due to their enhanced stability, controllable quantum well thickness and excellent photoelectric properties. The growth of large lateral size, small thickness and high quality single crystal films are necessary for the practical application of devices. Herein, we report a gas liquid interface crystalline route to grow BA2PbBr4 (BA =CH3CH2CH2CH2NH3+ single crystal films and achieve wafer size (38 cm2) and the thinness as little as 78 nm (aspect ratio>105) Moreover, an ultraviolet photodetector of the single crystal thin film presents a dark current of ~10 14 A, detectivity of ~1012 Jones and fast response time (trise 9.7 ms and tdecay 8.8 ms) Our work provides a way to grow large size perovskite single crystal films with small thickness, which is significant for the development of perovskite type high performance optoelectronic devices.
author_names: Junjie Yao

Guoxiang Zhao

Longzhi Li

Guifu Zou
title: Wafer sized 2D perovskite single crystal thin films for UV photodetectors
year: 2021

abstract: Hybrid perovskite materials have been intensively re investigated due to their opto electronic applications. Photoelectron spectroscopy measurements have been performed on polycrystalline films, yet the function of the organic cation remains unclear. We circumvent experimental limitations through measurements on well defined single crystal surfaces and find evidence for electronic coupling between the organic and inorganic sub lattices of the prototypical hybrid perovskite, which is contrary to the notion based on previous studies that the organic cation is electronically inert. The coupling may be relevant for understanding carrier dynamics in this class of materials.
author_names: Gabriel J Man

Cody Sterling

C Kamal

Konstantin A Simonov

Sebastian Svanstrom

Joydev Acharya

Fredrik O L Johansson

Erika Giangrisostomi

Ruslan Ovsyannikov

Thomas Huthwelker

Sergei M Butorin

Pabitra K Nayak

Michael Odelius

Haakan Rensmo
title: Electronic Coupling between the Organic and Inorganic Sub Lattices of a Hybrid Organic Inorganic Perovskite Single Crystal
year: 2020

abstract: Perovskite X ray detectors have been demonstrated to be sensitive to soft X rays <80 keV) for potential medical imaging applications. However, developing X ray detectors that are stable and sensitive to hard X rays (80 to 120 keV) for practical medical imaging is highly desired. Here, a sensitive 2D fluorophenethylammonium lead iodide (F PEA)2 PbI4 perovskite single crystal hard X ray detector from low cost solution processes is reported. Dipole interaction of organic ions promotes the ordering of benzene rings as well as the supramolecular electrostatic interaction between electron deficient F atoms with neighbor benzene rings. Supramolecular interactions serve as a supramolecular anchor to stabilize and tune the electronic properties of single crystals. The 2D (F PEA)2 PbI4 perovskite single crystal exhibits an intrinsic property with record bulk resistivity of 1.36 x 1012 O cm, which brings a low device noise for hard X ray detection. Meanwhile, the ion migration phenomenon is effectively suppressed, even under the large applied bias of 200 V, by blocking the ion migration paths after anchoring. Consequently, the (F PEA)2 PbI4 single crystal detector yields a sensitivity of 3402 uC Gy 1 air cm 2 to 120 keVp hard X rays with lowest detectable X ray dose rate of 23 nGyair s 1 outperforming the dominating CsI scintillator of commercial digital radiography systems by acquiring clear X ray images under much lower dose rate. In addition, the detector shows high operation stability under extremely high flux X ray irradiation.
author_names: Huayang Li

Jinmei Song

Wanting Pan

Daren Xu

Wan-An Zhu

Haotong Wei

Bai Yang
title: Sensitive and Stable 2D Perovskite Single Crystal X ray Detectors Enabled by a Supramolecular Anchor.
venue: Advanced materials
year: 2020

abstract: Hybrid organic inorganic lead perovskites have great potential in optoelectronic device applications due to their high stability, narrow band emission, and strong luminescence. Single crystals with few defects are the best candidates to disclose a variety of interesting and important properties for light emitting device. Here we investigate a single crystalline CH3NH3PbBr3 perovskite for its transport and electroluminescence properties. Simple fabrication method was used to obtain a 10+ 2 um channel between two gold wire electrodes, which showed bright intermittent electroluminescence near the interface of one wire after cooling down with a constant biasing voltage. The active region of the perovskite single crystal was pristine, well isolated from surroundings through the fabrication to characterization process. Our presented sample provided an ideal condition to study bulk ionic electronic properties of hybrid halide perovskites. At constant 6 V bias, the current through the sample shows temperature dependent oscillation with Arrhenius behavior, suggesting a thermally activated process. The light emission from the sample experiences an intermittent emission rate of once every 26+ 6 minutes. Here we envisage that the current oscillations and intermittent emission are caused by ion mediated negative differential resistance and conductive filament formation respectively. The latter observation inspires future applications of the material from neuromorphic computing to the development of electroluminescence devices.
author_names: Chathuranga Hettiarachchi

Aozhen Xie

Tien Hoa Nguyen

Junhong Yu

Francesco Maddalena

Xuan Quyen Dinh

Muhammad Danang Birowosuto

Cuong Dang
title: Current oscillations and intermittent emission near an electrode interface in hybrid organic inorganic perovskite single crystal.
venue: ACS applied materials interfaces
year: 2019

abstract: 2D organic inorganic lead iodide perovskites hold great promise for functional optoelectronic devices. However, their performances have been seriously limited by the poor long term stability in ambient environment. Here, we perform a systematic study on the stability improvement of a typical 2D organic inorganic lead iodide perovskite (PEA)2PbI4. The degradation of the (PEA)2PbI4 films can be attributed to the interaction with the humidity in environment, which leads to decomposition of the perovskite components. And then, we demonstrate that polymer passivation provides an effective approach for improving the crystal quality and stability of the (PEA)2PbI4 films. Correspondingly, the photoemission of the polymer passivated (PEA)2PbI4 films has been enhanced due to the decreased trap states. More importantly, a hydrophobic polymer (Poly(4 Vinylpyridine) PVP) will protect the (PEA)2PbI4 films from humidity in ambient environment, which can greatly improve the physical and chemical stability of the 2D perovskite films. As a result, the PVP passivated (PEA)2PbI4 films can produce a bright emission even after a long time >15 days) exposure to ambient environment (25 80% RH) and continuous UV illumination. This work provides a convenient and effective approach for improving the long term stability of 2D organic inorganic lead iodide perovskites, which shows great promise for fabricating large area and versatile optoelectronic devices.
author_names: Mostafa Abdelhamied

Yiling Song

Weiwei Liu

Xiao-hong Li

Hua Long

Kai Wang

Bing Wang

Peixiang Lu
title: Improved photoemission and stability of 2D organic inorganic lead iodide perovskite films by polymer passivation.
venue: Nanotechnology
year: 2020

abstract: Summary A luminescent all inorganic manganese bismuth heterometallic Cs4MnBi2Cl12 perovskite single crystal has been synthesized with a [BiCl6]3 [MnCl6]4 [BiCl6]3 triple layered two dimensional structure. Benefit from the effective energy transfer from [BiCl6]3 octahedron donor to luminescent [MnCl6]4 acceptor, Cs4MnBi2Cl12 shows a photoluminescence quantum yield (PLQY) of up to 25.7% ~610 nm) 51 fold higher than the Bi unalloyed CsMnCl3*2H2O counterpart. Suggested by the theoretical calculations, Bi and Mn exhibit hybridization in conduction and valence band, which further results in a favorable low activation energy for exciton transfer ~23 meV) By virtue of all inorganic chemical composition, Cs4MnBi2Cl12 exhibits impressive stability toward moisture, light, and heat. Furthermore, Cs4MnBi2Cl12 features strong soft X ray attenuation and bright radiative luminescence under X ray excitation, which pave a way for its application in medical flat panel X ray digital radiography. This work presents a new avenue toward fabrication of function directed material with tailored photoelectric properties.
author_names: Jun-Hua Wei

Jin-Feng Liao

Xu-dong Wang

Lei Zhou

Yong Jiang

Dai-Bin Kuang
title: All Inorganic Lead Free Heterometallic Cs4MnBi2Cl12 Perovskite Single Crystal with Highly Efficient Orange Emission
year: 2020