United States

An efficient AlGaN-based Far-UVC (222 nm) light-emitting diodes (LEDs) for the disinfection of SARS-CoV-2 (Coronavirus) are designed in this study. The simulation results show the remarkable optoelectronic performance of the proposed LEDs. Based on our results, we highly believe that this study providing a new approach for the development of efficient Far-UVC (222 nm) LEDs, which is a promising candidate for the disinfection of severe SARS-CoV-2 (Coronavirus).

AIP Publishing Horizons - Energy Storage and Conversion

Designing 222 nm III-Nitride-based Far UVC LEDs for the disinfection of SARS-2 (Covid-19)

optoelectronic performance

algan-based uvc

sars-cov-2

The Electronic Materials Conference (EMC) is the premier annual forum on the preparation, characterization and use of electronic materials. This year’s event will feature a plenary session, topical sessions, a poster session and more.

EMC is coordinated with the Device Research Conference (DRC), which will be held during the same week, from June 20-23. This recognizes the strong interaction between device and electronic materials research and provides fruitful exchange of information between attendees of both Conferences.

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<a href="https://www.mrs.org/docs/default-source/meetings-events/mrs-conference-services/2021/emc-2021/2021-emc-program-at-a-glance-6-16-21.pdf?sfvrsn=e39f950c_4">Latest Program-at-a-Glance</a>

<a href="https://drive.google.com/file/d/1eiS1ao4p83VNy8xgHs3Rls7gTQjx7Rc4/view?usp=sharing">Full Program with Abstracts</a>

EMC 2021

poster

Energy conversion and storage is a critical part of modern society. Applications continue to develop at a fast pace, from the development of new generation battery materials, to environmental sensors, catalytic materials for sustainable energy and solar cells and photodetectors. This conference will cover the latest advances in energy related fields and debate the needs and priorities currently existing or emerging in this field over the next few decades.

Conference Topics:

* Batteries and supercapacitors
* Catalytic materials and water splitting
* Light emitting materials and devices
* Solar cells and photodetectors
* Thermoelectric materials
* Sensing and environmental monitoring systems


If you have any questions, please visit the [Help Desk](https://underline.io/events/155/help-desk). 

To access the AIPP Energy Storage and Conversion conference, [please remember to register.  ](https://services.aip.org/AIPPHorizons/?confID=3351205)

Energy conversion and storage is a critical part of modern society. Applications continue to develop at a fast pace, from the development of new generation battery materials, to environmental sensors, catalytic materials for sustainable energy and solar cells and photodetectors. This conference will cover the latest advances in energy related fields and debate the needs and priorities currently existing or emerging in this field over the next few decades.

Ocean related activities are often supported by offshore equipment with particular power demands. These are usually deployed at remote locations and have limited space, thus small energy harvesting technologies, such as photovoltaic panels or wind turbines, are used to power their instruments. However, the inherent energy sources are intermittent and have lower density and predictability than an alternative source: wave energy.1 The triboelectric nanogenerator (TENG) is a promising and efficient energy harvesting technology capable of addressing these problems as it can efficiently convert regular/irregular external mechanical energy into electrical power based on the triboelectrification and electrostatic induction effects.2-4 In this work, three TENGs based on rolling-spheres were developed and their performance compared in both a “dry” bench testing system under rotating motions, and in a large-scale wave basin under realistic sea-states installed within a scaled navigation buoy. The experiments showed that the electrical outputs of these TENGs tend to rise with increasing pitch amplitudes and decreasing period due to the increase of the spheres’ velocity. The capability of these TENGs to harvest energy from ocean waves when incorporated into a navigational buoy was demonstrated under realistic sea states. The voltage generated by the TENGs achieves maximum values for periods close to the natural period of the scaled buoy (~ 0.92 s). The wave basin tests clearly demonstrated a significant dependency of the electrical outputs on the pitch degree of freedom and the need to consider the full dynamics of the buoy, and not only that of TENGs, when subjected to the excitations of waves.

Performance of triboelectric nanogenerators based on rolling spheres motion under realistic water waves conditions

A study on the effects of porosity on the capacitance of p-doped Si electrodes was carried out in the presented work. For that two different parameters, namely the porosification time and the current density applied in the anodization process have been varied and as a result 12 types of porous Si electrodes, corresponding to 6 different current densities and 2 different time durations, were obtained and evaluated in a plane parallel capacitor configuration through EIS, CV and C&D measurements. In addition to porosification, the electrodes have also been modified through electrodeposition of a conductive polymer and thermal treatment towards obtaining activated carbon at the surface.

In-depth analysis of porous Si electrodes for supercapacitors

The successful isolation of graphene (in 2004) and phosphorene (atomic layer thick black phosphorus) in 2014 and MXene (year 2011) has currently aroused the interest of 2D material researchers. In this review, first, the fundamentals of graphene and phosphorene and MXene, are briefly introduced, along with their structures, properties, and synthesis methods. Second, the readers are presented with an overview of their energy applications. Particularly in electrochemical energy storage, the large interlayer spacing (0.53 nm) in phosphorene allows the intercalation/deintercalation of larger ions as compared to its graphene counterpart (0.33 nm). Therefore, phosphorene may possess greater potential for high electrochemical performance for sodium ion batteries while graphene hold the promise for lithium ion batteries. Next, each application for energy generation, conversion, and storage is described in detail with milestones as well as the challenges. These emerging applications include supercapacitors, photovoltaic devices, water splitting, photocatalytic hydrogenation, oxygen evolution, and thermoelectric generators. Finally the fast-growing dynamic field of 2D research is summarized and perspectives on future possibilities are presented calling on the efforts of chemists, physicists, and material scientists.

Energy conversion and storage applications of graphene, phosphorene and Mxene

Photovoltaic (PV) devices such as GaAs, GaInP, organic and perovskite solar cells are highly desirable for harvesting ambient light energy and generating small amounts of power sufficient to run rechargeable batteries and sensors1. However, accurate test methods for measuring the electrical performance parameters of these devices under artificial light sources such as light emitting diodes, incandescent, or fluorescent lighting are lacking. Furthermore, fundamental energy loss mechanisms under these non-conventional lighting sources are not well understood.2,3 In this work, we describe the methodology and results of an accurate, reference-solar-cell-based method for measuring the current vs voltage (I-V) characteristics of solar cells under a variety of unique ambient light sources at an illuminance of 1000 lx or less. We describe some unexpected findings with implications for accurate characterization, such as sub-bandgap spectral effects in solar cells grown on heterosubstrates, and we unambiguously show how power conversion efficiency can be accurately determined. Additionally, we use absolute electroluminescence measurements to compute nonradiative recombination losses in these cells and, with additional energy loss calculations, display a clear picture of the balance of energy within each cell under unique ambient lighting conditions.

Measuring and understanding PV performance under ambient lighting

Small battery-powered electronic devices such as the Internet-of-Things (IoT) wireless sensors and actuators have found widespread use in many building environments in recent years. However, these devices rely on battery power and batteries need charging or replacement. Current research efforts have focused on finding ways for these sensors to self-harvest energy from the environment in which they are installed1. Indoor photovoltaics (IPV) are an intuitive choice for harvesting the wasted indoor ambient light, even under low light conditions, and using it to charge the battery and powering of these devices2. In this work, we investigate battery charging properties of small rechargeable batteries from low charge to full charge, by assembling and using PV mini-modules of three different technologies, including monocrystalline silicon (c-Si), gallium-indium-phosphide (GaInP) and gallium-arsenide (GaAs) under broadband LED lighting at an illuminance of 1000 lx. Battery charging times are shortest for the more efficient GaInP and GaAs mini-modules whose spectral responsivity are a better match to the LED test source, which contains mostly visible photons, and longest for the less efficient Si cells. As a demonstration, a wireless temperature sensor mote was attached to the charging circuit and operated to determine its power consumption in relation to the available charging power. The mote’s maximum power draw was less than the charging power from the least efficient c-Si mini-module. Our findings affirm the feasibility of utilizing PV under typical indoor lighting conditions to power IoT devices.

Indoor photovoltaics for battery-powered sensors

In the recent past, organometal halide perovskites have gained huge attention for application in various optoelectronic devices such as solar cells, light-emitting diodes (LEDs), photo-detectors, Lasers, etc.1,2 Such a wide range of applications are attributed to the extraordinary properties of these materials such as large range energy bandgap tunability from 2.43 eV to 1.50 eV, large absorption coefficients (~21.026 mm-1), large charge carrier lifetimes (~260 μs), mobilities (μe=73 cm2/V-sec, μh=43 cm2/V-sec), and diffusion lengths (~7.7 µm).3–6 However, the instability of bulk perovskite materials in ambient air conditions limits their usage at the device level. Contrary to bulk counterparts, the low-dimensional, as well as quasi dimensional perovskites, show improved stability which is promising for the development of these materials for optoelectronic devices. We present, the Ruddlesden-Popper phase 2D perovskites of type (CH)2(MA)n-1PbnI3n+1, [CH=2-cyclohexylethylamine; MA=methylamine] where, n is an integer and represents the number of inorganic layers of PbI6 octahedron in the perovskite crystal structure (Figure 1a). The spin-coating of these materials results into self-assembled highly crystalline films. The energy bandgap (Eg) of these films decreased with an increase in n-value and upon illumination with λex~470 nm LED strong and tunable photoluminescence is observed (Figure 1b). Photocurrent density (λex~470 nm) for the photo-detectors is found to increase with increase in n-value from 16.67 nA/cm2 (n=1) to 67.78 nA/cm2 (n=4) at 0V bias as well as with increase in bias.

Investigation of 2D Ruddlesden-Popper Perovskites Optoelectronic Devices

The present work reports a facile synthesis method to produce reduced graphene oxide/polyaniline (rGO/PANI) nanocomposites via a simple in-situ polymerization of aniline monomer in acid solution and later reoxidation of polyaniline by heavy oxidant. The Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM) results endorsed the formation of high quality rGO/PANI nanocomposite. The electrochemical properties of the rGO/PANI nanocomposites as supercapacitor materials were investigated. The cyclic voltammetry (CV) of rGO/PANI nanocomposites showed that in general, specific capacitance reduces with increasing scan rate within the range (10 – 100 mV/s). The fabricated rGO/PANI nanocomposites showed high specific capacitance as compared to PANI and rGO. The improved electrochemical performance suggests promising application of the rGO/PANI nanocomposites in high performance supercapacitors.


Synthesis of reduced graphene oxide/polyaniline nanocomposites for high performance supercapacitors

In the journey to Net-Zero, it is becoming increasingly evident that hydrogen (H2) technologies will play an important role. The energy transition is already taking shape with electrification and H2 technologies being the main drivers. To ensure that H2 technologies increase their contribution and share in a sustainable and reliable future energy system, it is imperative that the research, development and deployment (RD&D) challenges facing H2 technologies are addressed. 
This presentation reviews the current and future RD&D needs and gaps given their importance in bringing about a long-awaited H2 economy. RD&D opportunities for a global scale-up and use of H2 technologies are identified and discussed. They cover the entire H2 value chain, from production and storage to distribution and end uses, and span the entire technology readiness level (TRL) spectrum. Our review also shows the many opportunities for RD&D collaboration involving both public and private sectors, locally as well as globally.

Research, development and deployment needs and opportunities for a massive deployment of hydrogen technologies

In this work, anisotropic ambipolar (p x n)-type TTE materials are classified and analyzed theoretically according to positive or negative band gap, and the position of the Fermi energy relative to the respective band edges.

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Performance of triboelectric nanogenerators based on rolling spheres motion under realistic water waves conditions

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