Anisotropic circular photogalvanic effect in colloidal tin sulfide nanosheets

Moayed, Mohammad Mehdi Ramin; Li, Fu; Beck, Philip; Schober, Jan-Christian; Klinke, Christian

doi:10.1039/d0nr01189d

Cited by 24 publications

(4 citation statements)

References 34 publications

(88 reference statements)

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“…Besides the detection of LP light, the polarimeter enables the CP photoresponses. Because of the broken inversion symmetry of a material, the illumination of CP light onto the material results in a helicity-dependent photocurrent, which is called CPGE ( 34 – 41 ). In our polarimeter, the presence of anisotropic electric fields near the metal-BP contacts (originating from the Schottky barriers) will reduce the symmetry of the unit and result in a net CP photocurrent ( 42 – 44 ).…”

Section: Resultsmentioning

confidence: 99%

Twisted black phosphorus–based van der Waals stacks for fiber-integrated polarimeters

et al. 2022

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The real-time, in-line analysis of light polarization is critical in optical networks, currently suffering from complex systems with numerous bulky opto-electro-mechanical elements tandemly arranged along the optical path. Here, we design and fabricate a fiber-integrated polarimeter by vertically stacking three photodetection units based on six-layer van der Waals materials, including one bismuth selenide (Bi 2 Se 3 ) layer for power calibration, two twisted black phosphorus (BP) layers for polarization detection, and three hexagonal boron nitride (hBN) layers for encapsulation. The self-power-calibrated, self-driven, and unambiguous detection of both linearly polarized (LP) and circularly polarized (CP) light is realized by the broken symmetry–induced linear photogalvanic effects (LPGEs) and circular photogalvanic effects (CPGEs) in the two BP units. Moreover, the device enables single-pixel polarimetric imaging to acquire spatial polarization information. The ultracompact device structure, free from external optical and mechanical modules, may inspire the development of miniaturized optical and optoelectronic systems.

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Section: Resultsmentioning

confidence: 99%

Twisted black phosphorus–based van der Waals stacks for fiber-integrated polarimeters

et al. 2022

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“…The big challenge in this very promising field is to grow 2D structures using identical nanocrystal building blocks, resulting in 2D superstructures without geometrical disorder and with uniform necks. In a one-pot synthesis of PbSe nanocrystals using limited amounts of oleate ligands, PbSe nanorods and long nanowires (up to 30 μm in length and 4−20 nm in diameter) can be formed along the ⟨100⟩ direction; 15,54,55 see also Figure 2A. It is hypothesized that nanocubes are formed first, which act as intermediates that attach via their (100) facets.…”

Section: Brief History Of Oriented Attachment In Nonpolar Organic Sol...mentioning

confidence: 99%

“…In a one-pot synthesis of PbSe nanocrystals using limited amounts of oleate ligands, PbSe nanorods and long nanowires (up to 30 μm in length and 4–20 nm in diameter) can be formed along the ⟨100⟩ direction; ,, see also Figure A. It is hypothesized that nanocubes are formed first, which act as intermediates that attach via their (100) facets.…”

Section: Oriented Attachment In the Family Of Pbx Nanocrystals With P...mentioning

confidence: 99%

Oriented Attachment: From Natural Crystal Growth to a Materials Engineering Tool

et al. 2021

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Conspectus Intuitively, chemists see crystals grow atom-by-atom or molecule-by-molecule, very much like a mason builds a wall, brick by brick. It is much more difficult to grasp that small crystals can meet each other in a liquid or at an interface, start to align their crystal lattices and then grow together to form one single crystal. In analogy, that looks more like prefab building. Yet, this is what happens in many occasions and can, with reason, be considered as an alternative mechanism of crystal growth. Oriented attachment is the process in which crystalline colloidal particles align their atomic lattices and grow together into a single crystal. Hence, two aligned crystals become one larger crystal by epitaxy of two specific facets, one of each crystal. If we simply consider the system of two crystals, the unifying attachment reduces the surface energy and results in an overall lower (free) energy of the system. Oriented attachment often occurs with massive numbers of crystals dispersed in a liquid phase, a sol or crystal suspension. In that case, oriented attachment lowers the total free energy of the crystal suspension, predominantly by removal of the nanocrystal/liquid interface area. Accordingly, we should start by considering colloidal suspensions with crystals as the dispersed phase, i.e., “sols”, and discuss the reasons for their thermodynamic (meta)stability and how this stability can be lowered such that oriented attachment can occur as a spontaneous thermodynamic process. Oriented attachment is a process observed both for charge-stabilized crystals in polar solvents and for ligand capped nanocrystal suspensions in nonpolar solvents. In this last system different facets can develop a very different reactivity for oriented attachment. Due to this facet selectivity, crystalline structures with very specific geometries can be grown in one, two, or three dimensions; controlled oriented attachment suddenly becomes a tool for material scientists to grow architectures that cannot be reached by any other means. We will review the work performed with PbSe and CdSe nanocrystals. The entire process, i.e., the assembly of nanocrystals, atomic alignment, and unification by attachment, is a very complex and intriguing process. Researchers have succeeded in monitoring these different steps with in situ wave scattering methods and real-space (S)TEM studies. At the same time coarse-grained molecular dynamics simulations have been used to further study the forces involved in self-assembly and attachment at an interface. We will briefly come back to some of these results in the last sections of this review.

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“…[10] It leads to the generation of photocurrent depending on the degree of circular polarization of the incident light. In recent years, the CPGE has been intensively investigated in various nanostructured [11][12][13][14] and film [15][16][17][18][19][20] materials.…”

Section: Introductionmentioning

confidence: 99%

Wavelength‐Dependent Photocurrent Generation Efficiency in the Carbon Nanowall Films

Zonov

Fateev

Obraztsov

et al. 2022

Physica Status Solidi (b)

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Herein, the efficiency of generation of unipolar photocurrent pulses under action of obliquely incident nanosecond laser pulses is studied in carbon nanowall (CNW) films on silicon substrate depending on the direction of the wave vector and polarization of the laser radiation. The films consist of flake‐like graphite crystallites of nanometer thickness. Each of the crystallites comprises stacked graphene atomic sheets oriented mostly perpendicular to the substrate surface with random orientation in other directions. The angular and polarization dependencies of the longitudinal and transverse photocurrents at wavelengths of 266, 354.7, 532, and 1064 nm are measured. The longitudinal and transverse photocurrents are odd functions of the incidence angle, and, for a given angle of incidence, they are even and odd functions of the polarization azimuth, respectively. It is noteworthy that with the decrease in exciting radiation wavelength, the conversion coefficients of laser pulse power into longitudinal and transverse photocurrents increase and decrease, respectively. At wavelength of 266 nm, the transverse photocurrent changes its polarity, and the longitudinal photocurrent generated by s‐polarized radiation exceeds the p‐polarized radiation photocurrent. The obtained results are explained by morphology peculiarities of the CNW films and the surface photogalvanic effect photocurrent generation.

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Anisotropic circular photogalvanic effect in colloidal tin sulfide nanosheets

Abstract: The electronic response of colloidal 2D tin sulfide crystals to the illumination with circularly polarized light has been investigated. The nanocrystals show a strong anisotropic circular photogalvanic effect.

Cited by 24 publications

References 34 publications

Twisted black phosphorus–based van der Waals stacks for fiber-integrated polarimeters

Twisted black phosphorus–based van der Waals stacks for fiber-integrated polarimeters

Oriented Attachment: From Natural Crystal Growth to a Materials Engineering Tool

Wavelength‐Dependent Photocurrent Generation Efficiency in the Carbon Nanowall Films

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