Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices

Sun, Dali; Zhang, Chuang; Kavand, Marzieh; Wang, Jingying; Malissa, H.; Liu, Hao-Liang; Popli, Henna; Singh, Jaspal; Vardeny, Shai R.; Zhang, Wei; Boehme, Christoph; Vardeny, Z. Valy

doi:10.1063/1.5125230

Cited by 15 publications

(32 citation statements)

References 33 publications

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“…An increase in photon flux generates a larger change in the Kerr angle, presumably arising from more photocurrent density in the HOIP film, and hence results in more exchange current with the ferromagnetic substrate that increases the net magnetization. The saturation at the low light intensity implies an interfacial effect instead of a bulk photocurrent in the thick chiral-HOIPs film (∼300 nm), which is consistent with the spin diffusion length of the generated spin-polarized carriers limited to within 5 nm at room temperature. , …”

Section: Results and Discussionsupporting

confidence: 70%

Magneto-Optical Detection of Photoinduced Magnetism via Chirality-Induced Spin Selectivity in 2D Chiral Hybrid Organic–Inorganic Perovskites

Huang

Bloom

et al. 2020

ACS Nano

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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. That is, 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.

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Section: Results and Discussionsupporting

confidence: 70%

Magneto-Optical Detection of Photoinduced Magnetism via Chirality-Induced Spin Selectivity in 2D Chiral Hybrid Organic–Inorganic Perovskites

Huang

Bloom

et al. 2020

ACS Nano

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“…IREE R p ħ / Using these parameters, we derive a value for the Rashba coefficient of a = 0.34 eV Å. R This value is comparable in magnitude to the a = 0.33 eV Å R obtained from previous spin pumping measurements performed on polycrystalline MAPbBr 3 films measured at room temperature [62], although it is lower than the massive a = 11 eV Å R previously reported based on ARPES measurements of MAPbBr 3 single crystals [44].…”

Section: Ireesupporting

confidence: 65%

“…However, at the surface or interface this inversion symmetry is necessarily broken and therefore allows for the formation of a surface Rashba state. Indeed, it has been proposed that the giant Rashba splitting previously observed in MAPbBr3 stems from this surface state and not the bulk [27,65,66] and recently experimentally proven in the MAPbrBr3 polycrystalline thin film [62]. It is thus tremendously advantageous to utilize single crystals in the analysis of the surface Rashba state, where a single material surface may be isolated and probed and the effects of defects such as grain boundaries is minimized.…”

Section: Discussionmentioning

confidence: 99%

“…d N can be up to 2.5 mm for the thickness of single crystal) contributes to the generated transverse dc voltage: the spin current at a certain depth into the material is related to the spin diffusion length, resulting in a gradual increase of StC conversion when the thickness increases until it saturates [62]. In contrast, at a Rashba surface state, the StC conversion occurs with a constant conversion efficiency only at the surface state as detailed in previous reports [62,63]. Thus, a constant StC conversion coefficient in the form of IREE coherence length will be assumed.…”

Section: Oblique Hanle Spin Precessionmentioning

confidence: 99%

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Observation of long spin lifetime in MAPbBr₃ single crystals at room temperature

et al. 2020

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The emergence of hybrid metal halides (HMH) materials, such as the archetypal CH 3 NH 3 PbBr 3 , provides an appealing material platform for solution-processed spintronic applications due to properties such as unprecedented large Rashba spin-splitting states and highly efficient spin-to-charge (StC) conversion efficiencies. Here we report the first study of StC conversion and spin relaxation time in MAPbBr 3 single crystals at room temperature using a spin pumping approach. Microwave frequency and power dependence of StC responses are both consistent with the spin pumping model, from which an inverse Rashba-Edelstein effect coherence length of up to ∼30 picometer is obtained, highlighting a good StC conversion efficiency. The magnetic field angular dependence of StC is investigated and can be well-explained by the spin precession model under oblique magnetic field. A long spin relaxation time of up to ∼190 picoseconds is obtained, which can be attributed to the surface Rashba state formed at the MAPbBr 3 interface. Our oblique Hanle effect by FMR-driven spin pumping technique provides a reliable and sensitive tool for measuring the spin relaxation time in various solution processed HMH single crystals. Author ContributionD S and A A conceived this study and the experiment. S Y and E V fabricated the devices, measured the FMR, spin pumping, oblique Hanle effect, and calibrated rf field. T W provided the single crystals. E V, S Y, and D S wrote the text. D S and A A were responsible for the project planning and group managing. All authors discussed the results, worked on data analysis and manuscript preparation. The authors declare no competing financial interests. ORCID iDsEric Vetter https:/ /orcid.org/0000-0002-9596-160X Dali Sun https:/ /orcid.org/0000-0003-4662-3265 8

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“…[17,20] The hybrid interface can be also useful for generating spin-hall and inverse spin-hall effects. [21,22] Indeed, the nonmagnetic OIHPs can produce intrinsic MFEs in forms of magnetophotocurrent (MPC) and magnetophotoluminescence (MPL) even at room temperature. [15,16] The effects usually do not require ferromagnets and stem from the disturbance of spin-statistics such as singlets and triplets.…”

mentioning

confidence: 99%

Spinterfaces Manipulate Large Magnetic Field Effects in 3D and Quasi‐2D Organic–Inorganic Hybrid Perovskites

Pan

Wang

et al. 2021

Adv Elect Materials

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Owing to the presence of heavy elements such as lead (Pb) and iodine (I) in lead halide perovskites, they are known to have relatively stronger spin-orbit coupling (SOC). [7] Electronic structures of OIHPs exhibit the nondegenerated energy splitting for conduction bands. The interior crystalline inversion symmetrybreaking field leads to the spin degeneracy in term of Rashba effect mainly for the conduction bands. [8,9] Their giant dielectric permittivities help to generate Wannier-Mott excitons with low binding energies ranging from 37 to 98 meV. [10] This causes efficient dissociation of exciton in several picoseconds at room temperature. At present, intensive studies are concerned with the electronic charge and ion transport behaviors for OIHPs. [11,12] In order to fully emerge their potentials, using spin as an information carrier/bit can be a promising field for future optospintronics, nano-, and quantum electronics. [13,14] By far, spin related phenomena for OIHPs have been studied via measurements of magnetic field effects (MFEs) and spin-polarized electronic transport. [15][16][17][18][19] The formation of the ferromagnet/ perovskite spinterface such as Ni/MAPbI 3−x Cl x and Co/ MAPbI 3−x Cl x are known to have remarkable impact on magnetoresistance (MR) and magnetodielectric responses. [17,20] The hybrid interface can be also useful for generating spin-hall and inverse spin-hall effects. [21,22] Indeed, the nonmagnetic OIHPs can produce intrinsic MFEs in forms of magnetophotocurrent (MPC) and magnetophotoluminescence (MPL) even at room temperature. [15,16] The effects usually do not require ferromagnets and stem from the disturbance of spin-statistics such as singlets and triplets. Importantly, they were applied for revealing the internal spin dynamics at excited states for OIHPbased solar cells and light emitting devices. [15,16,23,24] On the other hand, an intriguing question may arise, to which extend, MFEs can be affected by ferromagnetic electrodes and the ferromagnet/perovskite spinterfaces.Herein, we have fabricated prototypical perovskite spin valves (PeSVs) with vertical structures comprising Ni/MAPbI 3−x Cl x / Ni and Ni/(PEA) 2 (MA) 3 Pb 4 I 13 /Ni. Both MAPbI 3−x Cl x and (PEA) 2 (MA) 3 Pb 4 I 13 are chemically processed based on our early experiences. [25,26] It produces rational MR even at room temperature. The signal is highly determined by the magnetic coupling of the two spinterfaces. With the same spintronic device configuration, the magnetophotocurrent at the short circuit Spinterfaces are due to the orbital hybridization at an interface of a ferromagnet and a nonmagnetic semiconductor. Interfacial densities of states (i-DOS) are spin-dependent, which may offer the spin-filter effect for enhancing spin-polarized charge injection efficiency and magnetic field effects (MFEs). In the work, a prototypical perovskite spin valve (PeSV) comprising Ni/MAPbI 3−x Cl x /Ni (MA = CH 3 NH 3 ) is fabricated, showing a clear magnetic switching behavior in the ambient condition. It is further explored ...

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Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices

Cited by 15 publications

References 33 publications

Magneto-Optical Detection of Photoinduced Magnetism via Chirality-Induced Spin Selectivity in 2D Chiral Hybrid Organic–Inorganic Perovskites

Magneto-Optical Detection of Photoinduced Magnetism via Chirality-Induced Spin Selectivity in 2D Chiral Hybrid Organic–Inorganic Perovskites

Observation of long spin lifetime in MAPbBr₃ single crystals at room temperature

Spinterfaces Manipulate Large Magnetic Field Effects in 3D and Quasi‐2D Organic–Inorganic Hybrid Perovskites

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Surface-enhanced spin current to charge current conversion efficiency in CH3NH3PbBr3-based devices

Cited by 15 publications

References 33 publications

Magneto-Optical Detection of Photoinduced Magnetism via Chirality-Induced Spin Selectivity in 2D Chiral Hybrid Organic–Inorganic Perovskites

Magneto-Optical Detection of Photoinduced Magnetism via Chirality-Induced Spin Selectivity in 2D Chiral Hybrid Organic–Inorganic Perovskites

Observation of long spin lifetime in MAPbBr3 single crystals at room temperature

Spinterfaces Manipulate Large Magnetic Field Effects in 3D and Quasi‐2D Organic–Inorganic Hybrid Perovskites

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Observation of long spin lifetime in MAPbBr₃ single crystals at room temperature