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Efficiency and degradation of a copper indium diselenide photovoltaic module and yearly output at a sunny site in Jordan

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  • Durisch, Wilhelm
  • Lam, King-Hang
  • Close, Josie

Abstract

The present work mainly deals with the testing and modeling of a commercially-available copper indium diselenide (CIS) ST40 module from the former Siemens Solar Industries (SSI). For this purpose, a large quantity of current/voltage characteristics were measured in the Paul Scherrer Institute (PSI)'s photovoltaic test-facility under different cell temperatures, solar irradiation and air mass, AM, conditions. They were used to develop a semi-empirical efficiency model to correlate all measured data sets. The goal was to make available a model, allowing quick and accurate calculation of the performance of the CIS module under all relevant operating conditions. For the undegraded state of the module, the efficiency model allowed us to deduce the efficiency at Standard Test Conditions, STC, and its temperature coefficient at STC, which were 11.58% and minus 0.050%/°C, respectively. The output of the undegraded module under STC was found to be 42.4 W, i.e., 6% higher than specified by the manufacturer (40 W). Furthermore, the efficiency does not decrease with increasing air mass. At a cell temperature of 25 °C and a relative air mass of 1.5, the module has a maximum in efficiency of 12.0% at an irradiance of about 650 W/m2. This indicates that the series-resistance losses become significant at higher irradiances. Hence, improving the transparent conducting oxide (TCO) electrode on the front side of the cells might lead to a higher output at high irradiances. Identical testing and modeling were repeated after having exposed the module to real weather conditions for one year. We found that the STC efficiency was reduced by 9.0%, from 11.58 down to 10.54%. The temperature coefficient of the efficiency had changed from minus 0.050 %/°C to minus 0.039%/°C. These results indicate possible chemical changes in the semiconductor film. The output of the module at STC was reduced by 9.0% from 42.4 W down to 38.6 W. Using meteorological data from a sunny site in the South of Jordan (Al Qauwairah) and the efficiency model presented here allows us to predict the yearly electricity yield of the CIS module in that area. Prior to degradation, the yield was found to be 362 kWh/m2 for the Sun-tracked module; and 265 kWh/m2 for the fix-installed module (South-oriented, at an inclination angle of 30°). After degradation the corresponding yields were found to be 334 and 241 kWh/m2; meaning losses of 8.4% and 9.5%, respectively. (Note: all units of energy, kWh, are referred to the active cell area.) Having available efficiency models for other module types, similar predictions of the yield can be made, facilitating the comparisons of the yearly yields of different module types at the same site. This in turn allows selecting the best module type for a particular site.

Suggested Citation

  • Durisch, Wilhelm & Lam, King-Hang & Close, Josie, 2006. "Efficiency and degradation of a copper indium diselenide photovoltaic module and yearly output at a sunny site in Jordan," Applied Energy, Elsevier, vol. 83(12), pages 1339-1350, December.
  • Handle: RePEc:eee:appene:v:83:y:2006:i:12:p:1339-1350
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    References listed on IDEAS

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    1. Durisch, W. & Urban, J. & Smestad, G., 1996. "Characterisation of solar cells and modules under actual operating conditions," Renewable Energy, Elsevier, vol. 8(1), pages 359-366.
    2. Durisch, Wilhelm & Keller, Johannes & Bulgheroni, Willy & Keller, Lothar & Fricker, Hans, 1995. "Solar irradiation measurements in Jordan and comparisons with Californian and Alpine data," Applied Energy, Elsevier, vol. 52(2-3), pages 111-124.
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    1. Thopil, George Alex & Sachse, Christiaan Eddie & Lalk, Jörg & Thopil, Miriam Sara, 2020. "Techno-economic performance comparison of crystalline and thin film PV panels under varying meteorological conditions: A high solar resource southern hemisphere case," Applied Energy, Elsevier, vol. 275(C).
    2. Piliougine, Michel & Sánchez-Friera, Paula & Petrone, Giovanni & Sánchez-Pacheco, Francisco José & Spagnuolo, Giovanni & Sidrach-de-Cardona, Mariano, 2022. "New model to study the outdoor degradation of thin–film photovoltaic modules," Renewable Energy, Elsevier, vol. 193(C), pages 857-869.
    3. Ayompe, L.M. & Duffy, A. & McCormack, S.J. & Conlon, M., 2010. "Validated real-time energy models for small-scale grid-connected PV-systems," Energy, Elsevier, vol. 35(10), pages 4086-4091.
    4. Torres-Ramírez, M. & Nofuentes, G. & Silva, J.P. & Silvestre, S. & Muñoz, J.V., 2014. "Study on analytical modelling approaches to the performance of thin film PV modules in sunny inland climates," Energy, Elsevier, vol. 73(C), pages 731-740.

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