Highly In-Plane Polarization-Sensitive Photodetection in CsPbBr<sub>3</sub> Single Crystal

Wang, Kaiyu; Lin, Jianming; Yao, Qing; Zhang, Jie; Cheng, Xiaohua; Yuan, Ye; Shang, Chenyu; Ding, Jianxu; Zhou, Tianliang; Sun, Haiqing; Zhang, Weiwei; Li, Huiping

doi:10.1021/acs.jpclett.1c00127

Cited by 29 publications

(28 citation statements)

References 43 publications

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“…Since the trap density is linearly proportional to the V TFL : [ 28,29 ]

{n_{{\rm{trap}}}} = \frac{{2\varepsilon {\varepsilon _0}{V_{{\rm{TFL}}}}}}{{{\rm{e}}{{\rm{L}}^2}}}

where L is the thickness of the CsPbBr 3 perovskites single crystal particles, ε is the dielectric constant of CsPbBr 3 (ε = 22), and ε 0 is the vacuum permittivity. [ 30,31 ] The trap density of CsPbBr 3 (100) cubes and CsPbBr 3 (111) tetrahedrons were thus calculated to be n trap (100) = 1.19 × 10 15 cm –3 and n trap (111) = 1.49 × 10 15 cm –3 , respectively. At high bias voltages above the V TFL , the currents then exhibit a quadratic voltage dependence in the Child regime.…”

Section: Resultsmentioning

confidence: 99%

All‐Inorganic Perovskite Single‐Crystal Photoelectric Anisotropy

Dong

Wei

et al. 2022

Advanced Materials

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a substantial effect on the band structure and electron behavior. Unfortunately, over past few years, most perovskite optoelectronic devices focus on polycrystalline perovskite thin-films, [10][11][12][13] and can only get the average surface-related optoelectronic properties of polycrystalline particles. The random arrangement of surface orientation in polycrystalline perovskite thin films seriously affects the carrier transportability and limits the microscopic photovoltaic performance. [14][15][16] Instead, a single-crystal-basedperovskite device can not only effectively improve photovoltaic performances due to their lower trap-state density and ultralong carrier diffusion lengths, [17][18][19] but also provide great opportunity for tailing the surface-determined optical and electronic properties. [17][18][19][20][21] However, it is still a great challenge to engineer the anisotropic surface of halide perovskite single crystals due to their ionic nature and fast crystallization during their regular solution-based growth, [22][23][24] and it is extremely difficult to quantify the surface-dependent optoelectronic properties as well as the underlying anisotropy mechanism.Herein, we report a one-step atmospheric-pressure chemical vapor deposition (APCVD) method for fabricating uniform perovskite CsPbBr 3 cube and tetrahedron single-crystals with precise control of ( 100) and ( 111) surface anisotropy, respectively (Figure S1, Supporting Information, see Methods in the Supporting Information for more synthesis details). The single-crystal-based optoelectronic devices demonstrated that the preferred (100) surface engineering of CsPbBr 3 singlecrystals enables a lowest surface bandgap energy of 2.33 eV, long carrier lifetime of 8.68 ns and high-rate carrier mobility up to 241 µm 2 V -1 s -1 , whereas the polar (111) surface induces ≈0.16 eV upward surface band bending and ultrahigh charged surface defect density of 1.49 × 10 15 cm -3 . Our results pave an ideal way to optimize the performance of halide-perovskitebased optoelectronic and/or catalysis devices by anisotropic surface engineering. Results and DiscussionScanning electron microscopy (SEM) images (Figure 1A-D) and optical microscopy images (Figures S2 and S3, Supporting Information) show that CsPbBr 3 cubes and tetrahedrons are uniform in size (≈4 µm) and monodispersed on the surface of the SiO 2 /Si substrate. The elemental distribution of Cs, Pb and Br was characterized using scanningelectron microscopy-energydispersive X-ray spectroscopy (SEM-EDS) elemental mapping, Engineering surface structure can precisely and effectively tune the optoelectronic properties of halide perovskites, but are incredibly challenging. Herein, the design and fabrication of uniform all-inorganic CsPbBr 3 cubic/tetrahedral single-crystals are reported with precise control of the ( 100) and ( 111) surface anisotropy, respectively. By combining with theoretical calculations, it is demonstrated that the preferred (100) surface engineering of the CsPbBr 3 single-crystals enables a lo...

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“…Since the trap density is linearly proportional to the V TFL : [ 28,29 ]

{n_{{\rm{trap}}}} = \frac{{2\varepsilon {\varepsilon _0}{V_{{\rm{TFL}}}}}}{{{\rm{e}}{{\rm{L}}^2}}}

Section: Resultsmentioning

confidence: 99%

All‐Inorganic Perovskite Single‐Crystal Photoelectric Anisotropy

Dong

Wei

et al. 2022

Advanced Materials

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“…The different facets of the perovskite microcrystals can have a significant impact on their conductive properties. [ 16,18,21,22 ] For example, Leblebici et al. [ 35 ] demonstrated facet‐dependent heterogeneity of the conductance of the grains in MAPbI 3 perovskite thin films.…”

Section: Resultsmentioning

confidence: 99%

“…[ 18–20 ] Toward single crystals, a few studies have reported that charge mobility and photoresponse depend on the exposed crystallographic facets. [ 16,21,22 ] In particular, it was found that the (001) facet of CsPbBr 3 crystals is more efficient for photodetection than the (010) and (100) facets. More recently, K. Wang et al.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, K. Wang et al. [ 22 ] showed that the optimization of the crystallographic facets, in this case of the (101), provides a route for enhanced in‐plane photoresponse under polarized light. Facet‐dependent heterogeneity in the photoconductivity of single grains in hybrid perovskite thin films has been also investigated, for example via conductive atomic force microscopy (C‐AFM), and revealed how crystal facets impact the key properties for solar cells such as the short‐circuit current and open circuit voltage.…”

Section: Introductionmentioning

confidence: 99%

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Surface‐Dependent Properties and Tunable Photodetection of CsPbBr₃ Microcrystals Grown on Functional Substrates

Abiedh

Dhanabalan

Kutkan

et al. 2021

Advanced Optical Materials

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All‐inorganic metal halide perovskites are highly attractive materials for optoelectronics and are typically implemented as thin films, nanocrystals, and single crystals with macroscopic and millimeter‐size dimensions. Single crystals with regular shapes in the micrometer range are less explored and present an interesting alternative when a well‐defined and spatially localized response is desired. Here, CsPbBr3 microcrystals are fabricated by simple and fast drop‐casting of a precursor solution on several substrates that for the growth process are heated to temperatures in the range from 80 to 150 °C. The microcrystals have a cubic shape and feature a pyramidal cavity on their top surface that forms due to faster growth at the edges once the growing crystal is attached to the substrate. Distinct heterogeneity in the photoluminescence (PL) and conductivity of the different facets are measured by µ‐PL and conductive atomic force microscopy experiments. Toward device applications, the authors contact single microcrystals on conductive substrates mechanically with a micromanipulator tip. They observe diode‐like current–voltage curves and good photodetector functionality, obtaining a high responsivity of 150–300 A W−1 in the blue–green spectral region under forward bias, and a sharp detection band centered around 540 nm with peak responsivity close to 0.7 A W−1 under reverse bias.

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“…Recently, Zhai's group and Liu's group have both demonstrated the high-performance PdSe 2 -based photodetectors for polarization sensitivity. The PdSe 2 -based photodetectors have a distinct linear dichroism with the photocurrent ratio of 1.9 at 532 nm and a fast response time of <11 ms. [67,68] The other 2D materials like type AB 3 , [72] ternaries, [75,130,208] and some perovskites [78][79][80]137] possess anisotropy owning to their more complex elements and atomic buildings. They broaden the response in the range of ultraviolet and mid-infrared.…”

Section: D Materialsmentioning

confidence: 99%

Anisotropic Low‐Dimensional Materials for Polarization‐Sensitive Photodetectors: From Materials to Devices

Wang

Jiang

et al. 2022

Advanced Optical Materials

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of polarization states: i) Natural light, the vibrational plane of which is not fixed. The electric vectors of natural light are axisymmetric, evenly distributed in all directions and synchronously vibrating. ii) Complete polarized light can be subdivided into linearly polarized light, elliptically polarized light, and circularly polarized light. Linearly polarized light has a fixed vibrational plane. The vibrational track of its electric vector is a straight line during propagation. Elliptically polarized light, similarly, the terminal trajectory that the electric vector vibrates is an ellipse. The plane of the ellipse is perpendicular to the propagative direction of light. And the electric vector rotates constantly, the magnitude and direction of which change regularly with time. When facing the direction light propagates, if the end of the electric vector travels counterclockwise, it is a right-handed circular polarization state; if clockwise, it is a left-handed circular polarization state. Circularly polarized light is a special case of elliptically polarized light. iii) Partially polarized light, the vibration of the electric vector has a comparative advantage in a certain direction. Simply, it is the superposition of natural light and complete polarized light. Because of that common characteristic of light, the polarization state of light provides a new degree of freedom in detection and application. [18,19] Early studies of the polarization-sensitive photodetectors mainly focus on the macroscopic anisotropy, which requires complex technologies for the patterning and aligning process. [20][21][22] Anisotropic low-dimensional materials have low-symmetry crystal structures including orthorhombic, monoclinic, and triclinic so that they have intrinsic anisotropic properties [23][24][25] obtaining highly polarization sensitivity for photodetectors. [26,27] Fortunately, low-dimensional materials are emerging due to their large families, [28][29][30][31][32] fascinating photo electric characteristics, [28,[32][33][34] and naturally microscopic anisotropy among most of them. [23] From early on, the pioneering work has been done on BP-based polarization-sensitive photodetectors, which advance the development of anisotropic systems in this application. [35] According to the diversified evolution of element types, apart from black phosphorus, [36][37][38][39][40] some monoelemental 2D materials with anisotropy like black arsenic, [41,42] antimonene, [43,44] borophene, [45,46] and tellurene [47,48] have been discovered and studied. Meanwhile, a mass of anisotropic binaries have sprung up typically including

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Highly In-Plane Polarization-Sensitive Photodetection in CsPbBr₃ Single Crystal

Cited by 29 publications

References 43 publications

All‐Inorganic Perovskite Single‐Crystal Photoelectric Anisotropy

All‐Inorganic Perovskite Single‐Crystal Photoelectric Anisotropy

Surface‐Dependent Properties and Tunable Photodetection of CsPbBr₃ Microcrystals Grown on Functional Substrates

Anisotropic Low‐Dimensional Materials for Polarization‐Sensitive Photodetectors: From Materials to Devices

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Highly In-Plane Polarization-Sensitive Photodetection in CsPbBr3 Single Crystal

Cited by 29 publications

References 43 publications

All‐Inorganic Perovskite Single‐Crystal Photoelectric Anisotropy

All‐Inorganic Perovskite Single‐Crystal Photoelectric Anisotropy

Surface‐Dependent Properties and Tunable Photodetection of CsPbBr3 Microcrystals Grown on Functional Substrates

Anisotropic Low‐Dimensional Materials for Polarization‐Sensitive Photodetectors: From Materials to Devices

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Product

Resources

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Highly In-Plane Polarization-Sensitive Photodetection in CsPbBr₃ Single Crystal

Surface‐Dependent Properties and Tunable Photodetection of CsPbBr₃ Microcrystals Grown on Functional Substrates