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1

Temperature Effect on Performance of Different Solar Cell Technologies

Adeeb Jehad, Farhan Alaa, Al-Salaymeh Ahmed

Journal of Ecological Engineering

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2019

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Vol. 20, nr 5

249--254

EN

One of the main parameters that affect the solar cell performance is cell temperature; the solar cell output decreases with the increase of temperature. Therefore, it is important to select the proper solar cell technology that performs better at a specified location considering its average temperatures. In addition, the solar cell performance is directly reflected on the overall economics of the project. This paper is proposed to evaluate the variations in the performance of different solar cell technologies related to the temperature in Amman, Jordan. Field data of weather station and three PV systems (Poly-crystalline, Mono-crystalline and Thin-film) of identical design parameters were collected from Test Field Project at Applied Science Private University, Shafa Badran, Amman, Jordan. These data were analysed in the following way. estimated specific energy yield (kWh/kWp) for the three different PV systems was calculated depending on the measured value of solar irradiance and technical specifications of the installed solar panels and inverters, then the actual energy yield at different temperatures over one year was compared with the estimated value, so the deviations could be determined and actual temperature coefficients for energy yield could be calculated, knowing that the three PV Systems have identical design parameters (tilt angle, azimuth angle, type and dimensions of mounting structure and inverter size) and same cleaning method and schedule. It was found that the thin-film solar panels are less affected by temperature with temperature coefficient of -0.0984%, and -0.109%, -0.124% for Mono-crystalline and Poly-crystalline respectively. These results can be implemented in the preliminary design steps, specifically in the selection of the solar cell technology to be installed in a specific location.

2

Electrical properties mono- and polycrystalline silicon solar cells

Dobrzański L.A., Szczęsna M., Szindler M., Drygała A.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 59, nr 2

67--74

EN

Purpose: The goal of this article was to compare the properties of mono- and polycrystalline silicon solar cells. It was based on measurements performed of current-voltage characteristics and calculated parameters using mathematical formulas. Design/methodology/approach: Light and dark current-voltage characteristics of solar cells were measured using a solar simulator PV Test Solutions company SS150AAA model. The measurements were performed under standard conditions (Pin = 1000 W/m², AM1.5G spectrum, T = 25°C). The basic characteristic of the solar cells were determined using the software SolarLab and calculated using mathematical formulas. Findings: Results and their analysis allow to conclude that measurements of current-voltage characteristics enable characterization of the basic parameters of solar cells. Can give important information about the property of prepared metallic contacts on the solar cells. Practical implications: Knowledge about the current-voltage characteristics of solar cells and their basic parameters enables the assessment of the quality of their production and the improvement. Originality/value: The paper presents some researches of the basic parameters of mono- and polycrystalline solar cells determining the current-voltage characteristics.

3

Sposób zagospodarowania uszkodzonych mechanicznie krzemowych ogniw fotowoltaicznych

Grzesiak W., Bieńkowski A., Klugman-Radziemska E., Pisarkiewicz T.

Elektronika : konstrukcje, technologie, zastosowania

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2011

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Vol. 52, nr 4

42-44

PL

W procesie produkcji modułów fotowoltaicznych niejednokrotnie dochodzi do uszkodzenia mechanicznego pojedynczych ogniw. Po odpowiedniej obróbce mogą one jednak stanowić pełnowartościowy materiał i mogą być wykorzystane jako elementy składowe modułów. W artykule zaproponowano technologię zagospodarowania uszkodzonych mechanicznie ogniw, polegającą na odcięciu przy pomocy lasera części ogniwa tak, aby uzyskać ogniwo o mniejszych wymiarach, ale regularnych kształtach. Do badań wykorzystano produkowane seryjnie ogniwa z krystalicznego krzemu. Poprzez pomiar charakterystyk prądowo-napięciowych określono ich początkowe parametry elektryczne, a następnie - poprzez odłamanie ich części - zasymulowano uszkodzenie mechaniczne. Tak przygotowane ogniwa zostały następnie przycięte z użyciem lasera w celu uzyskania regularnego kształtu, pozwalającego na dobre upakowanie ogniw w module. Zastosowano wiele różnych sposobów cięcia, różniących się zarówno mocą wiązki laserowej, jak również stroną ogniwa, do której doprowadzano tę wiązkę.

EN

In the PV module manufacturing process often single solar cells get damaged mechanically. Nevertheless such a damaged cell is still a full value material and can be used as a component for a PV module. Technology for utilizing damaged cells was developed, it uses laser for cutting cells into smaller, regular shaped pieces. Mass production, crystalline silicon cells were used for experiments. Their original electrical parameters were determined by measuring current-voltage characteristics, and then mechanical damage was simulated by breaking of a piece of the cell. Broken cells were then cut by laser to ensure regular shape that allows proper packaging in a module. Various ways of cutting were used: different laser beam power was applied to both sides of the cell. Additional measurements of I-V characteristics allowed to determine if the procedures had an effect on the cell efficiency.

4

Influence of the Silver Electrode Surface Structure on Electrochemical Adsorption on Thiourea in Perchloric Acid Solution

Smoliński S.

Polish Journal of Chemistry

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2001

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Vol. 75, nr 10

1493-1504

EN

Electrosorption of thiourea (TU) on single crystal electrodes: Ag(111), Ag(100) and Ag(110) was studied using electrochemical and radiochemical methods. A radiotracer method, with TU labeled with C-14 in 0.1 M HClO4, was used to determine the surface concentration of the adsorbate. From radiometric data it follows that adsorption of TU is reversible with respect to the bulk concentration and the potential in the range of ideal polarizability of electrodes. The maximum surface concentration of TU, determined radiometrically, follows the sequence: Ag(111) _ Ag(100) _ Ag(110), which is in agreement with the atom surface density of the silver planes. The simple Langmuir adsorption equation describes experimental data up to 80% of surface coverage. The Gibbs energy of adsorption is similar (25.5 _ 1 kJ/mol) for all planes studied.