Tuning Exchange Interactions in Organometallic Semiconductors

被引:0
作者
Rawat, Naveen [1 ,2 ]
Manning, Lane W. [1 ,2 ]
Hua, Kim-Ngan [1 ,2 ]
Headrick, Randall L. [1 ,2 ]
Cherian, Judy G. [3 ]
Bishop, Michael M. [3 ]
McGill, Stephen A. [3 ]
Furis, Madalina I. [1 ,2 ]
机构
[1] Univ Vermont, Dept Phys, Burlington, VT 05405 USA
[2] Univ Vermont, Mat Sci Program, Burlington, VT 05405 USA
[3] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
来源
SPINTRONICS VIII | 2015年 / 9551卷
基金
美国国家科学基金会;
关键词
magnetic circular dichroism; photoluminescence; long range order; delocalization; exchange interaction; organometallics; phthalocyanine; FIELD-EFFECT TRANSISTORS; PHTHALOCYANINE; SPINTRONICS;
D O I
10.1117/12.2186442
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Organic semiconductors are emerging as a leading area of research as they are expected to overcome limitations of inorganic semiconductor devices for certain applications where low cost manufacturing, device transparency in the visible range or mechanical flexibility are more important than fast switching times. Solution processing methods produce thin films with millimeter sized crystalline grains at very low cost manufacturing prices, ideally suited for optical spectroscopy investigations of long range many-body effects in organic systems. To this end, we synthesized an entire family of organosoluble 3-d transition metal Pc's and successfully employed a novel solution-based pen-writing deposition technique to fabricate long range ordered thin films of mixtures of metal-free (H2Pc) molecule and organometallic phthalocyanines (MPc's). Our previous studies on the parent MPc crystalline thin films identified different electronic states mediating exchange interactions in these materials. This understanding of spin-dependent exchange interaction between delocalized pi-electrons with unpaired d spins enabled the further tuning of these interactions by mixing CoPc and H2Pc in different ratios ranging from 1:1 to 1000:1 H2Pc:MPc. The magnitude of the exchange is also tunable as a function of the average distance between unpaired spins in these materials. Furthermore, high magnetic field (B < 25T) MCD and magneto-photoluminescence show evidence of spin-polarized band-edge excitons in the same materials.
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页数:8
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