Photogenerated Polarons in High-Tc Superconducting Oxides: Infrared Excitation Spectroscopy and Transient Photoinduced Conductivity in Semiconducting Yttrium-Barium-Copper-Oxides
Photogenerated Polarons in High-Tc Superconducting Oxides: Infrared Excitation Spectroscopy and Transient Photoinduced Conductivity in Semiconducting Yttrium-Barium-Copper-Oxides
批准号:
9102634
负责人:
Alan Heeger
金额:
$0.0万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
1991
资助国家:
美国
项目状态:
已结题
起止时间:
1991-02-15 至 1992-01-31
中文摘要
申请的资金用于探索性研究小额赠款,以研究高温超导氧化物系列材料的快速瞬态光致电导率和光致吸收。该研究人员实验室的光致吸收研究已经证明氧化铜平面上的载流子是极化子,并且已经观察到铜酸钇钡单晶的电阻率的大的瞬态降低。该研究将寻找极化子对超导电性机制影响的实验证据。激发水平将足够高以接近光诱导金属态和光诱导超导性。
英文摘要
Funds are requested for a Small Grants for Exploratory Research award to study the fast transient photoinduced conductivity and photoinduced absorption of materials from the family of high temperature superconducting oxides. Photoinduced absorption studies in this researcher's laboratory have already demonstrated carriers on the copper oxide planes are polarons and large transient decreases in the resistivity of single crystals of yttrium-barium cuprate have been observed. The proposed research will search for experimental evidence of the relevence of the polarons to the mechanism of superconductivity. The level of excitation will be sufficiently high to approach a photoinduced metallic state and photoinduced superconductivity.
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Opportunities and Challenges in the Field of Semiconducting (conjugated) Polymers
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批准号:0856060
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项目类别:Continuing Grant
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资助金额:$70.0万
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财政年份:2009
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负责人:Alan Heeger
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依托单位:
Light Emission From Ambipolar Semiconducting Polymer Field Effect Transistors
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批准号:0602280
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项目类别:Continuing Grant
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资助金额:$37.8万
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财政年份:2006
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负责人:Alan Heeger
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依托单位:
Luminescent Polyelectrolytes for use in Biosensors
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批准号:0099843
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项目类别:Continuing Grant
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资助金额:$33.0万
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财政年份:2001
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负责人:Alan Heeger
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依托单位:
Conjugated Polymers as Materials for Solid State Lasers
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批准号:9730126
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项目类别:Standard Grant
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资助金额:$30.9万
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财政年份:1998
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负责人:Alan Heeger
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依托单位:
Ultrafast Spectroscopic Studies of Forster Energy Transfer in Semiconducting Polymer Blends: The Route to High Gain Materials for Low Threshold Polymer Lasers
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批准号:9812852
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项目类别:Standard Grant
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资助金额:$0.0万
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财政年份:1998
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负责人:Alan Heeger
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依托单位:
Polymer Light-Emitting Electrochemical Cells: A New Direction for Electroluminescent Devices Fabricated with Conducting Polymers
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批准号:9528204
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项目类别:Continuing Grant
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资助金额:$22.5万
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财政年份:1996
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负责人:Alan Heeger
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依托单位:
Ultrafast Spectroscopic Studies of Semiconducting Polymer Blends: The Route to High Efficiency Photoluminescence
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批准号:9510387
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1995
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负责人:Alan Heeger
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依托单位:
Conjugated Polymers in Solution and in the Solid State
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批准号:9300366
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项目类别:Continuing Grant
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资助金额:$45.0万
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财政年份:1993
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负责人:Alan Heeger
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依托单位:
Transient Photo-induced Conductivity in High Tc Materials: Phase Separation in Photogenerated Carriers into Metallic Drops and Photo-Induced Superconductivity
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批准号:9121946
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1992
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负责人:Alan Heeger
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依托单位:
Gel-Processing as a Route to High Performance Oriented Electronic and Optical Polymer Materials: Design and Synthesis on the Supramolecular Length Scale
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批准号:9100033
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1991
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负责人:Alan Heeger
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依托单位:
Conducting Polymers as Macromolecular Systems: Comprehensive Studies in Solution, in the Melt, and in the Solid State
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批准号:8915207
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1990
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负责人:Alan Heeger
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依托单位:
Sub-Picosecond Electro-Optic Sampling Facility for Fast Transient Photoconductivity Studies of Materials from the Family of High Temperature Superconducting Oxides
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批准号:9005866
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项目类别:Standard Grant
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资助金额:$0.0万
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财政年份:1990
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负责人:Alan Heeger
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依托单位:
Time-Resolved Optical Waveguide Experiments with Conjugated Polymers: Direct Measurement of the Magnitude and Sign of Third Order Non-linear Optical Susceptibility
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批准号:9012808
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1990
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负责人:Alan Heeger
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依托单位:
US-Belgium Cooperative Research: Development and Characterization of Conjugated Polymers
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批准号:8912268
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项目类别:Standard Grant
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资助金额:$0.93万
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财政年份:1989
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负责人:Alan Heeger
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依托单位:
Oriented Conducting Polymers: Solution Processing and Characterization
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批准号:8703399
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1988
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负责人:Alan Heeger
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依托单位:
Gels and Solutions of Soluble Conjugated Polymers
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批准号:8615483
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1987
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负责人:Alan Heeger
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依托单位:
Synthesis of New Organic Materials with Unusual Properties (Materials Research)
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批准号:8514944
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项目类别:Continuing Grant
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资助金额:$29.98万
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财政年份:1986
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负责人:Alan Heeger
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依托单位:
Electron Spin Resonance Studies of Conducting Polymers: Charge Storage and Charge Transport in Non-Degenerate Ground State Polymers (Materials Research)
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批准号:8521392
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1986
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负责人:Alan Heeger
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依托单位:
Synthesis of Conducting Polymers and A New Graphite (Parquetite) (Materials Research)
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批准号:8601206
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1986
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负责人:Alan Heeger
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依托单位:
New Syntheses of Polyenes (Materials Research)
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批准号:8215176
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项目类别:Continuing grant
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资助金额:$0.0万
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财政年份:1983
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负责人:Alan Heeger
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依托单位:
海外基金