A molecular spin-photovoltaic device

Sun, Xiangnan; Vélez, Saül; Atxabal, Ainhoa; Bedoya-Pinto, Amílcar; Parui, Subir; Zhu, Xiangwei; Llopis, Roger; Casanova, Fèlix; Hueso, Luis E.

doi:10.1126/science.aan5348

Cited by 159 publications

(178 citation statements)

References 32 publications

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“…Organic molecular films are traditional van der Waals materials composed of π‐conjugated carbon‐based elements. Countless variation of these molecules together with long spin coherence due to light constitute atoms boosted recent move to molecular/organic spintronics . However, their most attractive and unexplored advantage could be well‐balanced intra/intermolecular coupling that is not so homogeneous like metal but has well‐established intramolecular coupling and weak but fairly stable interlayer coupling.…”

Section: Introductionmentioning

confidence: 99%

Emergence of Multispinterface and Antiferromagnetic Molecular Exchange Bias via Molecular Stacking on a Ferromagnetic Film

Byun

Lee

et al. 2020

Adv Funct Materials

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Heterointerfaces may exhibit unexpected physical properties distinct from intrinsic properties of component materials. In particular, metal–organic interfaces can drive unique interfacial spin moments, which are often called molecular spinterface. Here, van der Waals stacking of molecular layers may lead to variations in the intra/interlayer exchange coupling resulting in multiple ground states, which is highly desired for multifunctional magnetic devices. In this report, the emergence of molecular multispinterface of paramagnetic cobalt‐octaethyl‐porphyrin (CoOEP) layers in a Fe/CoOEP heterostructure is demonstrated through the interfacial layer and a successive antiferromagnetic molecular spin chain. The disentangled interfacial ferromagnetic spins lead to multiple magnetic ground states and behave as additional spin‐dependent scattering centers, as evidenced through the magnetotransport study. In addition, the antiferromagnetic molecule spin chain derives tunable exchange bias, which signifies the dominance of the antiferromagnetic interfacial interaction. Theoretical calculations demonstrate spin configurations of the molecular chain and the antiferromagnetic interfacial coupling through oxygen intermediaries. The development of the molecular multispinterface and controllable exchange bias therein will provide a promising route for the active control of multivalued data processing at the nanoscale.

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Section: Introductionmentioning

confidence: 99%

Emergence of Multispinterface and Antiferromagnetic Molecular Exchange Bias via Molecular Stacking on a Ferromagnetic Film

Byun

Lee

et al. 2020

Adv Funct Materials

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“…[1][2][3][4][5][6][7][8][9] This offers the possibility to retain the spin information over long distances and perform advanced spin manipulations, such as in the potential prospects of increased processing speed, reduced power consumption, and nonvolatility. [28] Actually, much more organic small molecules were applied in the OSV devices, including tris(8-hydroxyquinoline)aluminum (Alq 3 ), [21,[29][30][31][32][33] fullerene (C 60 and C 70 ), [34][35][36][37][38] rubrene, [39] pentacene, [40] bathocuproine, [41,42] and lanthanide molecules. [21,27] After that, Majumdar et al prepared polymers spin valve with LSMO/P3HT/Co structure, and analyzed that P3HT and LSMO electrodes occurred certain chemical interaction leading to a spin-selective tunneling interface.…”

Section: Introductionmentioning

confidence: 99%

Magnetoresistance and Spinterface of Organic Spin Valves Based on Diketopyrrolopyrrole Polymers

Zheng

Feng

Gao

et al. 2019

Adv Elect Materials

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recombination in organic light-emitting diodes and organic magnetoresistance (MR) devices. [9][10][11][12] Moreover, organic semiconductors have obvious advantages, lower cost, and better flexibility, and they have greater possibility in wearable and large area applications. [13][14][15][16][17][18][19][20] The most common prototype organic device using spin freedom is organic spin valves (OSVs), [5,11,[21][22][23][24][25] which consist of a nonmagnetic spacer sandwiched between two ferromagnetic (FM) electrodes, and based on the alignment of the electron spin relative to the FM layer magnetization orientation. In this research field, there are tunneling and diffusive regimes. [26] The tunneling regimes occur in relatively thinner spacers (<15 nm), and the mode is weakly dependent on temperature. The diffusive regimes are also called hoping in organic spintronics. This mode occurs in relatively thicker layers (≥15 nm), and it is strongly dependent on temperature. In addition, the present study lies in the diffusive regime owing of the conductivity mismatch problem and more abundant phenomena like Hanle effect in organic spintronics. For organic semiconductor, both spin-orbit interaction and the hyperfine interaction play very significant parts in determining the spin relaxation, but the origin of determining the spin relaxation in organic semiconductors is still unknown. Herein, OSV effect is characterized by the MR ratios, defined as MR = (R ap − R p )/R p , where R ap and R p denote the resistance in the antiparallel and parallel states of FM electrode magnetization direction, respectively. There are lots of efforts to explore organic spintronics Organic materials are proposed to be excellent spin transport layers due to their weak hyperfine and spin-orbit coupling interaction. Donor−acceptortype polymers PTDCNTVT-420 and PTDCNTVT-320 with diketopyrrolopyrrole (DPP) units are employed as the spacers in the organic spin valves, which have more advantages such as solution processing, higher mobility, and large area fabrication. The performance of polymers spin valves based on DPP units with different alkyl side chain lengths are studied. The different top ferromagnetic (FM) electrodes Co and Ni 80 Fe 20 are used for spin detection resulting in obvious distinct magnetoresistance (MR) values. The MR ratio of approaching 30% at 10 K is achieved with the Ni 80 Fe 20 electrodes using PTDCNTVT-420 with longer alkyl side chain lengths. Moreover, the MR behaviors are observed depending on various temperatures, which are related with the FM electrodes spin injection efficiency. The direct spinterface are also investigated by transmission electron microscopy (TEM) and atomic force microscopy (AFM). In addition, the series of results indicate that the PTDCNTVT polymers can be used as good spin transport model materials and give clues for future polymers spintronic studies.

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“…With these precedents one can envision that the fabrication of smart spintronic devices containing hybrid interfaces based on these switchable molecular systems will be soon feasible, in the same way as multifunctional molecules have already produced the first examples of multifunctional spintronic devices coupling spin with light (spin‐OLEDs) and spin‐photovoltaic cells …”

Section: Discussionmentioning

confidence: 99%

Hybrid Interfaces in Molecular Spintronics

Forment‐Aliaga

Coronado

2018

The Chemical Record

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Molecular/inorganic multilayer heterostructures are gaining attention in molecular electronics and more recently in new generation spintronic devices. The intrinsic properties of molecular materials as low cost, tuneability, or long spin lifetimes were the original reasons behind their implementation. However, the non-innocent role played by these hybrid interfaces is a determinant factor in the device performance. In this account we will give an overview about different types of hybrid molecular system/ferromagnet interfaces, which can be of direct application in molecular spintronics. This includes the insertion of a 2D material in between the molecular system and the ferromagnet. As perspective, new hybrid interfaces able to tune the spin properties under an external stimulus, are proposed. These smart interfaces, based on switchable magnetic molecules or flexible MOFs, can open the way to new multifunctional spintronic devices able to couple the spin with a second property.

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A molecular spin-photovoltaic device

Cited by 159 publications

References 32 publications

Emergence of Multispinterface and Antiferromagnetic Molecular Exchange Bias via Molecular Stacking on a Ferromagnetic Film

Emergence of Multispinterface and Antiferromagnetic Molecular Exchange Bias via Molecular Stacking on a Ferromagnetic Film

Magnetoresistance and Spinterface of Organic Spin Valves Based on Diketopyrrolopyrrole Polymers

Hybrid Interfaces in Molecular Spintronics

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