Our Current Research Areas Include

  • Perovskite photovoltaic cells

  • Polymer/nanoparticle photovoltaic cells

  • Organic photodetectors

  • Organic Thin Film Transistors

  • Polymer light emitting diodes

  • Organic Ferroelectronics

  • Perovskite Solar Cells

    Perovskite materials are arising as a new generation of solution processable inorganic-organic hybrid photovoltaic materials.

    Our research on perovskite solar cell involves in:

    1) Device engineering for the record device efficinecy

    2) Understanding the fundamental devices physics to explore the theoretically attainable highest efficiency;

     

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    Polymer/nanoparticle photovoltaic cells

    Polymer photovoltaic is a device to convert solar energy to electric energy. The active layer generally consists of two types of organic semiconductors. They form type II heterojunction to facilitate the splitting of photon generated excitons. With energy conversion efficiency approaching that of amorphous silicon solar cell, polymer solar cell has shown promising potential as a low cost alternative to its inorganic counterpart.

    Our research on polymer solar cell involves in:

    1) Understanding the fundamental devices physics to explore the theoretically attainable highest efficiency;

    2) Design device structure to fully extract the energy harvested by the semiconducting polymer;

    3) Synthesize low bandgap inorganic semiconductor nanoparticles, and form inorganic/polymer composite

    4) Material to harvest both visible and infrared light;

    5) Low cost fabrication process for large area device scaling up.

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    Organic photodetectors

    Photodetectors are sensor of light that convert optical signals into electric signals. There are generally two types of organic solid -state photodetectors: photoconductors (or photoresistors) and photodiodes (includes photovoltaic).  Photodiodes type photodetector typically has low noise and fast response but the responsivity is low. Photoconductor type photodetector has very large gain but generally slow response. We are working on a new type of organic semiconductor material based photodetector which combines the advantages of these two types of photodetectors.

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    Organic thin film transistors

    OTFTs are a promising candidate to build new generation of low-cost, disposable and flexible electronic devices and sensors. OTFTs are the key building blocks for displays and memory circuits for smart cards and RF identification tags.  Our current research focuses on the fabrication of very high performance OFET using low cost fabrication process, and the integration of new functionalities such as flexibility and transparency.

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    Polymer light emitting diodes

    Polymer Light Emitting Diode (PLED) is a device to convert electric current to light, whose emissive layer comprises of polymer semiconductor materials. Polymer films are made into thin films by the low-cost spin coating or large scale Roll-To-Roll (R2R) manufacture process. Applications of PLED are two folds: flat panel display and solid state lighting. Our research focuses on understanding the fundamental mechanisms of the devices, as well as new material, interface engineering, and device structures to enhance device performance and to reduce device fabrication cost.

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    Organic Ferroelectronics

    This picture is created from high resolution SEM images of PVDF nanostructure.

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    Funding Sources