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This paper presents the development of an energy efficient environmental sensor that sends measurement data to a cloud platform using HTTP (Hypertext Transfer Protocol) requests. The device is based on a programmable system-on-chip (PSoC), and is equipped with a temperature and relative humidity sensor for taking measurements and with a WLAN (wireless local area network) module for sending data to...
We present WinATE, a new computer program to measure the electronic transport properties of materials with energy applications. The C++ program we describe here is designed with a user-friendly graphical interface to automate measurement. WinATE controls laboratory test and measurement equipment through a RS-232 serial interface. It was designed to measure electronic properties of synthesized materials...
Tin sulphide is a promising absorber material for low-cost and earth abundant thin film solar cells. In this regard, we have studied phase composition, structural, and electrical properties of n-CdS/p-SnS heterostructure obtained by the close spaced vacuum sublimation (CSS) method. Surface and cross-sectional morphology of the structure were studied by using of field emission scanning electron microscope...
The characterization of concentration modules based on Fresnel lens performed in outdoor conditions is presented. Two different types of high concentration photovoltaic modules with point focusing silicone on glass Fresnel lenses as optical concentration element are characterized in order to make a comparison between them. Main differences between the two modules are represented by the number of multijunction...
We present a method for estimating overheating of a partially covered solar cell module by use of short-circuit current measurement combined with infrared thermography. The resulting analysis allows for predictive calculation of over-heating and thus prevention of damage to the solar cell module due to partial shadow induced overheating.
In this paper, Ti-doped GaZnO (GTZO) quaternary alloys were used as the transparent conductive oxides (TCOs) for Cu(In, Ga)SeSe2 (CIGS) solar cell application. These thin films are highly favorable for solar power systems. Photoluminescence measurement and X-ray diffraction were employed to investigate the GTZO thin films. Advantageous crystal quality was produced by radio-frequency magnetron sputtering...
Pb-free silver pastes based on SnO-B2O3 glass frits were synthesized and used for the front-contact electrodes of crystalline silicon (c-Si) solar cells. First, four kinds of SnO-B2O3 glass frits with different amounts of SnO were synthesized by a melt-quenching method, and four Ag pastes based on these glass frits were prepared correspondingly. Then, Ag pastes were printed on c-Si solar cells and...
An accurate estimation of the series resistance in the PV model is crucial to the prediction of the maximal output power of the PV module, especially under temperature variation. This Paper proposes a theoretical expression to calculate accurately the value of this resistance. The proposed expression comes from the physical nature of the various elements constructing this resistance, plus the reverse...
Organic photovoltaic (OPV) is now well researched in the photovoltaic field due to the discovery on conjugated polymer and bulk-heterojunction. The only problem with organic photovoltaic is that its low power conversion efficiency due to low photocurrent. Photocurrent is mainly effected by electrical mobility and also the device's thickness. A polymer call is a well used in organic photovoltaic but...
External Quantum Efficiency (EQE) measurement is one important method that is implemented to observe solar cells' behaviour in a specific range of wavelength. This research measured EQE in different type of solar cells: silicon, dye-sensitised solar cell (DSSC), and perovskite solar cell. The objectives of this research are to understand the correct EQE measurement method and to understand the factors...
The power conversion efficiency of perovskite solar cells has exceeded 22% within a few years. To further optimize their performance, the focus should be on minimizing the defects and barriers in the devices. In this work, Kelvin probe force microscopy (KPFM) together with admittance spectroscopy (AS) is utilized in the characterization of charge injection barriers and defects states in perovskite...
Temperature dependence of polymer solar cell with a poly (3-hexylthiophene) : indene-C60 bisadduct (P3HT:ICBA) active layer were investigated from 15°C to 50°C to evaluate their application in standard working conditions. A standard drift-diffusion model including the temperature dependent hole mobility was used as a starting point to simulate measured I-V curves. Temperature induced solar cell parameters...
This work describes the electrical characterization of CIG(S,Se)2 sub-modules in order to compare the related performances with those obtained from traditional silicon photovoltaic modules. This characterization has been performed through means of a test bench, mainly composed by a solar simulator equipment, allowing the determination of the parameters of the prototypes under test at different irradiances...
Photovoltaic (PV) energy production has become more and more important in the latest years. The need of energy efficiency pushed the research in this field both on material innovation and system management. As well known, an essential task in a PV system is performed by the tracking algorithm that has to assure the maximum power generation of the system. Many Maximum Power Point Tracking (MPPT) techniques...
Dye Sensitized Solar Cells (DSSCs) are nowadays more and more employed since they present lower production costs than traditional silicon photovoltaic devices. An interesting phenomenon affecting such devices consists in the fact that current density-voltage (J-V) characteristic can depend on the history of the cell prior to the measurement, which often can be assimilated to an anomalous hysteresis...
This paper proposes a comprehensive modeling and parameters extraction method of solar photovoltaic module based on the Particle Swarm Optimization algorithm. The characteristic curves of photovoltaic panel are obtained by using only the information provided by the manufacturer data-sheet, avoiding the need to carry out experimental data. The performance and the accuracy of the proposed method are...
Experimentally established, the influence of the working temperature and solar radiation power on the efficiency of industrial production silicon solar cells. Based on the experimental results designed the concept of a hybrid solar generating module equipped with a mirror concentrator of solar radiation and solar cells cooling system for using in high-performance solar energy station. Concentrator...
The performance of the hybrid structures PV/TEG/STC which consist of photovoltaic cells PV, thermoelectric elements TEG and solar collector STC is studied in this paper function of different levels of illumination from 30 suns to 130 suns (1 sun = 1000 W/m2). The concentrated light is obtained using a solar simulator with four parabolic xenon lamps and an optical mixer to ensure the quasi homogenous...
Renewable energy sources have been of great interest to electricity producers in Thailand. There are many renewable energy sources usually used: wind power, hydropower, geothermal energy, bio energy and solar energy. Thailand is located near the equator, leading to high solar radiation all year. Hence, production of electricity from solar energy has become a more reasonable alternative than other...
A new technology was developed allowing for room temperature covalent bonding. The surface preparation method allows for in situ native oxides removal and fabrication of oxide-free bonded interfaces which could be directly used in fabrication of various devices (e.g. solar cells).
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