The role of heavy metal ions on spin transport in organic semiconductors

Chen, B B; Wang, S; Jiang, Shengwei; Yu, Zhi-Gang; Wan, Xiangang; Ding, Haifeng; Wu, Di

doi:10.1088/1367-2630/17/1/013004

Cited by 10 publications

(11 citation statements)

References 42 publications

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“…Figure f shows the temperature dependence of GMR measured by Xiong et al They observed a large GMR effect at low temperatures but the effect reduced considerably with increasing the temperature and vanished at room temperature. Similar dependence of the GMR on temperature has been reported with other organic molecules and polymers as well . Either the reduction of the electrode spin polarization or of the spin diffusion length at high temperature can be responsible for the reduction of the GMR at increased temperatures.…”

Section: Fundamental Conceptssupporting

confidence: 80%

“…Therefore, this spin diffusion length measurement technique has unavoidable uncertainty. Figure shows the MR values (normalized to their maximum) measured as a function of the interlayer thickness and their modified‐Jullière fit for representative OSCs as extracted from different studies . The figure depicts a general trend that the MR decreases significantly with the thickness and vanishes at a certain thickness.…”

Section: Advances In Organic Spin Valvesmentioning

confidence: 99%

“…Thickness dependence of MR ratio measured by different groups for organic spin valves with various OSC interlayers (Xiong et al; Rybicki et al; Chen et al; Jiang et al; Li et al; and Morley et al).…”

Section: Advances In Organic Spin Valvesmentioning

confidence: 99%

“…For example, the spin diffusion length in C 60 ‐based spin valves measured by several groups is no longer than that in the conventional OSCs although the HFI is essentially absent in the material . In addition, the measurement of spin diffusion length in Ir(ppy) 3 , one of the strongest phosphorescent materials used in OLEDs, is comparable with that in Alq 3 with much smaller SOC . This implies that either the tunneling might happen in the device or a special spin transport mechanism such as the spin exchange coupling may happen in OSVs…”

Section: Challengesmentioning

confidence: 99%

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Organic Spin Valves: A Review

Devkota

Geng

Subedi

et al. 2016

Adv Funct Materials

108

106

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accelerated impressively and advanced to a range of materials and a number of techniques to verify the successful injection and transport of the SP carriers. [ 1,2,10,11 ] The effect has been realized in a variety of materials combinations such as FM fi lms, FM/anti-FM coupled layers, or FM semiconductors as the injection/detection electrodes and the metals, superconductors, inorganic semiconductors, organic semiconductors, and insulators including ferroelectric and topological insulators as the spacers. [ 1,2,[12][13][14][15][16][17][18] The GMR effect was extensively studied using non-magnetic metallic interlayer and its applications such as electric switching, magnetic recording, and sensors were suggested and employed. [ 1,2,16 ] However, all-metallic spintronic devices imposed restrictions in applications as they are characterized by short spin relaxation time (≈picosecond) and are not suitable for coherent spin manipulation. [ 1,2,19 ] To overcome these limitations, the spintronics community caught its attention towards hybrid devices with semiconductors (SCs) sandwiched in between the FM layers and continued advancing to a range of semiconducting materials. [ 2,14,[20][21][22] The organic semiconductors (OSCs) are among the youngest members of the spacer materials and were fi rst tested in the spintronic devices only about a decade ago. Nevertheless, OSC devices have been of continuously advancing research topics over the past three decades for their rich physics, fl exible chemi stry, cost effi ciency, and potential applications in new generations of electronic devices including organic light emitting diodes (OLEDs), [23][24][25] organic solar cells, [ 26,27 ] and organic fi eld effect transistor. [ 28,29 ] In fact, OLEDs have already revolutionized the modern display industry and spin-dependent devices such as organic spin valves (OSVs), OLED-based magnetic sensors, and spin-OLEDs are under intensive study to achieve their new avenues. [30][31][32] This increasing interest on organic electronics is for their several distinctions over inorganic counterparts. [19][20][21]33,34 ] Electronically, the band theory explains the electric transport in inorganic SCs while charge hopping is the main transport mechanism in the OSCs with much smaller carrier mobility. This is a favorable condition for large electron-hole pair recombination without the need of using a p-n junction structure. [23][24][25] Spintronically, the inorganic SCs contain heavy atoms giving rise to a large spin-orbit coupling (SOC), which is a response of the electron spin degree of freedom to its orbital environment. The strength of the SOC in solids depends upon the nature of orbital wave functions of electrons and the materials structure. [ 35 ] In case of hydrogenic wave-function-like electrons (s-orbital electrons), it is Organic spintronics is an emerging and potential platform for future electronic devices. Signifi cant progress has been made in understanding the spin injection, manipulation, and detection in organic spin valves in the p...

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Section: Fundamental Conceptssupporting

confidence: 80%

Section: Advances In Organic Spin Valvesmentioning

confidence: 99%

Section: Advances In Organic Spin Valvesmentioning

confidence: 99%

Section: Challengesmentioning

confidence: 99%

See 2 more Smart Citations

Organic Spin Valves: A Review

Devkota

Geng

Subedi

et al. 2016

Adv Funct Materials

108

106

View full text Add to dashboard Cite

show abstract

“…Index Terms-Organic, spin-pumping, Spintronics, transport I. INTRODUCTION pin transport experiments of various organic molecular materials have been conducted in recent years [1][2][3][4][5][6]. Previously, our group achieved spin transport in thermally evaporated pentacene films [1].…”

mentioning

confidence: 99%