Two-Dimensional Hybrid Perovskite-Type Ferroelectric for Highly Polarization-Sensitive Shortwave Photodetection

Wang

Han

et al. 2020

Chemistry A European J

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3D perovskite CsPbBr3 has recently taken a blooming position for optoelectronic applications. However, due to the lack of natural anisotropy of optical attributes, it is a great challenge to fulfil polarization‐sensitive photodetection. Here, for the first time, we exploited dimensionality reduction of CsPbBr3 to tailor a 2D‐multilayered hybrid perovskite, (TRA)2CsPb2Br7 (1, in which TRA is (carboxy)cyclohexylmethylammonium), serving as a potential polarized‐light detecting candidate. Its unique quantum‐confined 2D structure results in intrinsic anisotropy of electrical conductivity, optical absorbance, and polarization‐dependent responses. Particularly, it exhibits remarkable dichroism with the photocurrent ratio (Ipc/Ipa) of ≈2.1, being much higher than that of the isotropic CsPbBr3 crystal and reported CH3NH3PbI3 nanowire (≈1.3), which reveals its great potentials for polarization‐sensitive photodetection. Further, crystal‐based detectors of 1 show fascinating responses to the polarized light, including high detectivity (>1010 Jones), fast responding time (≈300 μs), and sizeable on/off current ratios (>104). To our best knowledge, this is the first study on 2D Cs‐based hybrid perovskite exhibiting strong polarization‐sensitivity. The work highlights an effective pathway to explore new polarization sensitive candidates for hybrid perovskites and promotes their future electronic applications.

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Multilayered 2D Cesium‐Based Hybrid Perovskite with Strong Polarization Sensitivity: Dimensional Reduction of CsPbBr₃

Wang

Han

et al. 2020

Chemistry A European J

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“…In principle, the linear dichroism can be achieved through the intrinsic anisotropy of crystal structures or extrinsic geometric effects . Compared with the devices based on external geometric effects (e.g., the 1D nanostructure), which require a complicated operation to assemble the device and align channel materials, the burgeoning anisotropic 2D materials are inherently sensitive to the polarized‐light and thus enable a highly efficient photodetection . The mainstream of this field is dominated by inorganic 2D systems, such as metallic graphene, black phosphorus, and transition metal dichalcogenides (e.g., MoS 2, ReS 2 , and GeSe 2 ) .…”

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confidence: 99%

“…For instance, (PEA) 2 PbI 4 exhibits linear dichroism deriving from the absorption disparity under polarized light along three crystallographic axis directions . More recently, high‐performance polarized‐light detectors were constructed using 2D hybrid perovskite of (BA) 2 (MA)Pb 2 Br 7 , based on the strong anisotropy of crystal architecture and optical absorption. In this context, it is proposed that intrinsic linear dichroism of 2D hybrid perovskites provides a great opportunity to achieve new candidates for polarized‐light detection.…”

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confidence: 99%

Intrinsic Strong Linear Dichroism of Multilayered 2D Hybrid Perovskite Crystals toward Highly Polarized‐Sensitive Photodetection

Advanced Optical Materials

et al. 2019

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to the polarized-light and thus enable a highly efficient photodetection. [13][14][15][16][17][18] The mainstream of this field is dominated by inorganic 2D systems, such as metallic graphene, black phosphorus, and transition metal dichalcogenides (e.g., MoS 2, ReS 2 , and GeSe 2 ). [5,6,[19][20][21][22][23] However, their device assembling often suffers from the complicated, high-cost and energy-intensive integration; it is particularly difficult to obtain bulk high-quality crystals. [24][25][26][27] All these unfavorable issues stimulate the urgent demand for exploring new linear dichroism systems as the feasible alternatives or supplements to the inorganic counterparts.Organic-inorganic 2D hybrid perovskites, as a subclass of 3D cubic prototype, have been explored for multiple applications, benefiting from their unique physical merits including structural flexibility, superior stability, and quantum-confined effects, etc. [28][29][30][31][32][33][34][35][36] From the structural perspective, organic components and inorganic frameworks feature an alternative arrangement, which resembles the quantum-confined architecture and therefore manifests the strongly anisotropic characteristics. [13,14] Particularly, this configuration anisotropy closely relates to the electronic structure and dielectric properties that exert a great influence on their optical absorption. The absorption coefficients along different crystallographic axes can be achieved from imaginary part and real part of the dielectric functions. That is, the real and imaginary parts of the complex refractive index are highly dependent on crystalline directions, thus corresponding to optical anisotropy of 2D hybrid perovskites (i.e., linear dichroism). [8] Definitely, such intrinsic linear dichroism of 2D hybrid perovskites affords infinite promises for polarized-light detections. For instance, (PEA) 2 PbI 4 exhibits linear dichroism deriving from the absorption disparity under polarized light along three crystallographic axis directions. [8] More recently, high-performance polarized-light detectors were constructed using 2D hybrid perovskite of (BA) 2 (MA)Pb 2 Br 7 , [18] based on the strong anisotropy of crystal architecture and optical absorption. In this context, it is proposed that intrinsic linear dichroism of 2D hybrid perovskites provides a great opportunity to achieve new candidates for polarized-light detection. Linear dichroism of 2D materials is brought into practical operation of polarized light detection; currently, organic-inorganic 2D hybrid perovskites with the linear dichroic nature offers immense potentials within this portfolio.Here, a newly tailored 2D hybrid perovskite, (iBA) 2 (MA)Pb 2 I 7 (1, where MA + is methylammonium and iBA + is n-isobutylammonium) is investigated, adopting a highly anisotropic bilayered perovskite motif that results in strong crystallographic-dependence of linear dichroism. Both the absorption spectra (300-650 nm) and polarized-sensitive activities of 1 exhibit the distinctive anisotropic characteristics. Con...

“…For the 2D layered RPHP, metal and halogen atoms are connected through tight covalent bonds and together construct 2D metal‐halide perovskite layers, while the organic cations link to these metal‐halide layers through weak hydrogen‐bonding interactions . Generally, the 2D inorganic perovskite frameworks make a dominant contribution to the semiconducting properties, which are significant for the subsequent optoelectronic application. From a structural point of view, these 2D Ruddlesden‐Popper (R‐P) type multi‐layered hybrid perovskites possess an alternate arrangement of inorganic bilayers and organic alkylammonium cation.…”

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confidence: 99%

Highly Oriented Thin Films of 2D Ruddlesden‐Popper Hybrid Perovskite toward Superfast Response Photodetectors

Han

Yao

et al. 2019

Small

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2D hybrid perovskites have shown great promise in the photodetection field, due to their intriguing attributes stemming from unique structural architectures. However, the great majority of detectors based on this 2D system possess a relatively low response speed (≈ms), making it extremely urgent to develop new candidates for superfast photodetection. Here, a new organic–inorganic hybrid perovskite, (PA)2(FA)Pb2I7 (EFA, where PA is n‐pentylaminium and FA is formamidine), which features the 2D Ruddlesden–Popper type perovskite framework that is composed of the corner‐sharing PbI6 octahedra is reported. Significantly, photodetectors fabricated on highly oriented thin films, which exhibit a perfect orientation parallel to 2D inorganic perovskite layers, exhibit a superfast response time up to ≈2.54 ns. To the best of the knowledge, this figure‐of‐merit catches up with that of the top‐ranking commercial materials, and sets a new record for 2D hybrid perovskite photodetectors. Moreover, extremely high photodetectivity (≈1.73 × 1014 Jones, under an incident power intensity of ≈46 µW cm−2), considerable switching ratios (>103), and low dark current (≈10 pA) are also achieved in the detector, indicating its great potential for high‐efficiency photodetection. These results shed light on the possibilities to explore new 2D candidates for assembling future high‐performance optoelectronic devices.