Green photonics, energy, and related technologies - 1Virtual room: INO - 2
|Tuesday, May 26|
GP-1-26-1 / Using photonics to power and cool the planet
* Jeremy Munday, University of California, Davis, United States
Cleaner power generation technologies are needed to reduce our reliance on fossil fuels and to reduce the negative effects of climate change, but will that be enough? In this presentation, I will discuss our latest work on two fronts. First, I will discuss how to make more efficient photovoltaic devices and sensors through the extraction of thermally energetic carriers (e.g. hot carriers) before they relax. Second, I will discuss the potential of radiative cooling to modify the global energy flux to combat global warming.
GP-1-26-2 / DC Micro-grids: Power Delivery of the Future
* Suzan Eren, Ms., Canada
Renewable energy sources such as wind and solar will soon be responsible for mainstream power generation. As a result, there is an urgent need to develop the technology necessary to bring renewable energy to the forefront and fully integrate it into the power system. Micro-grids are an essential component of this objective. Since the current grid infrastructure is based on AC power delivery, AC micro-grids have been a very active research topic. However, the exponential growth of DC sources/loads (e.g., solar power, batteries, LEDs, smartphones, chargers, computers, servers, etc.) make the development of DC micro-grids desirable. DC sources/loads are most efficiently used in a DC power architecture, and so, for the purpose of integrating renewable energy sources into the power system, DC micro-grids offer superior performance in terms of efficiency and reliability. This invited talk will cover how DC micro-grids are a viable option as the building blocks of future power systems, and the challenges and research solutions for integrated power delivery will also be discussed.
GP-1-26-4 / Disposable Carbon-based Electronic and Optoelectronic Sensors
* George Knopf, The University of Western Ontario, Canada
Dogan Sinar, The University of Western Ontario
Single-use sensors must be designed to maintain stable functionality during operation, but once the usefulness has concluded the device is disposed of in a landfill or destroyed in an incinerator. This paper describes the chemical synthesis and fabrication processes used to create benign carbon based electronic films, electrodes, and sensor circuits on degradable flexible substrates. The conductive inks are nontoxic graphene and carboxymethyl cellulose (G-CMC) aqueous suspensions. Electronic and optoelectronic sensors are fabricated by depositing nanoparticles, biomolecules, and polymer gels on the printed G-CMC electrodes. Examples of non permanent carbon-based circuits and sensors are discussed.
GP-1-26-5 / Bipolar Electrode Induced Electrochemical Doing and Electroluminescence in Polymer Light-emitting Electrochemical Cells
* Shiyu Hu, Queen's University, Canada
Polymer light-emitting electrochemical cells (PLECs) exploit the semiconducting properties of a luminescent conjugated polymer (CP) and the ionic conductivity of a solid polymer electrolyte (SPE). When biased with a DC voltage, in situ electrochemical doping of the CP leads to the formation of a narrow, electroluminescent p-n junction. PLECs are solution processable and attractive candidates for low-cost lighting and display applications. To improve the response time and light output of PLECs, floating conductors are embedded into the PLEC active layer via inkjet printing, shadow masking or photolithographic techniques. The conductors function as bipolar electrodes (BPEs) to induce p- and n-doping reactions at their opposite ends. The doped regions between the BPEs then interact to form multiple emitting junctions at a much faster speed. Here, we show the dynamic doping process and the intricate doping patterns observed at various BPEs that included metals, dispersed micro-particles, and doped polymers. BPE-containing PLECs also display giant photovoltaic open-circuit voltage or discharging open-circuit voltage. We discuss the possibility of PLEC-based energy generating/storage devices.