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Photoemissive ionization source is a kind of stable, sensitive, selective, and reliable ionization source for ion mobility spectrometry, which can find a wide range of applications such as security checking, air and food quality monitoring. State-of-the-art ion source adopts a thin gold film, which is costly and suffered from long term stability. There is a continuous effort to search stable low cost...
High performance CH3NH3PbI3 perovskite photodetectors are realized by applying thin films of fullerene derivatives as interfacial layers between the metal contact and the perovskite materials. The perovskite photodetector with PC61BM interlayer demonstrates much better performance than that with IC60BA interlayer, reaching a responsivity of 57.6 mA/W. The influences of different fullerene derivatives...
A IGZO transistor is capped with needle-like organolead trihalide perovskite (MAPbI3) layer for photo detection application. The MAPbI3 capped IGZO phototransistor demonstrates excellent responsivities and sensitivities to light in both UV and visible region. Furthermore, fast transient response has been achieved without persistent photocurrent (PPC) behavior.
Since the traditional two-level changeover circuits are not capable of obtaining both high energy utilization efficiency and low bank voltage fluctuation, a novel three-level changeover circuit of super-capacitor bank was proposed for energy storage systems in this paper. The proposed circuit has symmetrical structure. Thus, currents flowing in each branch are always identical. The amount of switches...
This paper proposed a universal two-level changeover circuit of super-capacitor bank for energy storage systems. Using the proposed circuit, the energy utilization efficiency can reach a higher level while the bank voltage fluctuation is limited at a smaller level. This reduces the required size of the energy storage systems and hence cost reduces. Furthermore, the circuit is relatively simple for...
As novel energy storage devices, multi-layer capacitors demonstrated good prospect along with the emergency of materials with huge dielectric constant and high breakdown electric field strength. The distribution of inner electrodes in multi-layer capacitors is a key factor to make full use of the excellent characteristics of the new dielectric materials. This paper studies and compares four various...
A composite energy storage system is proposed to work in conjunction with the tubular direct drive linear wave energy converters (DDLWECs) which have high power factors. The energy storage system smoothes the output power fluctuations from the tubular DDLWECs and provides stable and dispatch-able electricity to the grid or local load. The system works as a micro-grid system integrating renewable generation...
A grid connected photovoltaic(PV) generation system with supercapacitor energy storage in a dc-coupled structure is proposed. The objective of this system is acquiring maximum power from PV arrays, keep the voltage of dc bus constant and supply the prescribed active and reactive power to power grid. An improved Perturbation and Observation (P&O) maximum power point tracking(MPPT) algorithm is...
A two phase wave energy emulator is developed to imitate the expected voltage sourced waveforms generated from a direct drive wave energy converter (DDWEC). H-bridge working in conjunction with DDWEC is considered in two control schemes. The emulator provides convenience in testing power electronics for DDWEC in the laboratory.
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