Searched for: author%3A%22Barreau%2C+N.%22
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Bakker, K. (author), Assen, S. (author), Rasia, A. (author), Barreau, N. (author), Weeber, A. (author), Theelen, M. (author)
Partial shading of PV modules can lead to degradation of the shaded cells. The degradation originates from a reverse bias voltage over the shaded cells. In order to mitigate reverse bias damage in Cu(In,Ga)Se2 (CIGS) modules, a good understanding of the fundamental mechanisms governing the reverse characteristic is required. In this study, a...
article 2022
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Yang, S. (author), Khelifi, S. (author), Brammertz, G. (author), Choubrac, L. (author), Barreau, N. (author), Bolt, P. (author), Vermang, B. (author), Lauwaert, J. (author)
Numerical models are proposed that are able to describe the current-voltage (I-V) behaviour of two Cu2ZnGeSe4 (CZGSe) solar cells measured under different illuminations at 300 K. In the model, the doping density of the CZGSe layer and the mobility of carriers are determined by capacitance-voltage (C-V) profiling and AC field Hall effect...
article 2020
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Bakker, K. (author), Aahman, H.N. (author), Burgers, T. (author), Barreau, N. (author), Weeber, A. (author), Theelen, M. (author)
Partial shading of monolithically interconnected Cu(In,Ga)Se2 (CIGSe) modules can lead to the formation of reverse bias induced defects. These localized defects permanently reduce the output of the PV module. The formation and propagation mechanisms of these defects is studied. Understanding these mechanisms can help to prevent or mitigate...
article 2020
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Bakker, K. (author), Nilsson Ahman, H. (author), Aantjes, K. (author), Barreau, N. (author), Weeber, A.W. (author), Theelen, M. (author)
Partial shading of Cu(In,Ga)Se2 modules can lead to the formation of reverse bias induced wormlike defects. These wormlike defects act as local shunts and permanently decrease module output. A good understanding of the formation and propagationmechanisms of these defects is needed in order tomitigate the negative effects, or to prevent these...
article 2019
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Shi, W. (author), Theelen, M.J. (author), Gevaerts, V.S. (author), Illiberi, A. (author), Barreau, N. (author), Butterling, M. (author), Schut, H. (author), Egger, W. (author), Dickmann, M. (author), Hugenschmidt, C. (author), Zeman, M. (author), Bruck, E. (author), Eijt, S.W.H. (author)
Positron annihilation depth-profiling is used as an innovative tool to monitor the evolution of vacancy defects in two series of ZnO:Al transparent conductive oxide (TCO) layers for Cu(In,Ga)Se2 (CIGS) solar cells under accelerated degradation at 85 °C/85% relative humidity. The first series of ZnO:Al layers are deposited directly on flat glass...
article 2018
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Theelen, M. (author), Bakker, K. (author), Steijvers, H. (author), Roest, S. (author), Hielkema, P. (author), Barreau, N. (author), Haverkamp, E. (author)
The levelized cost of electricity (LCOE) of photovoltaic (PV) systems is determined by, among other factors, the PV module reliability. Better prediction of degradation mechanisms and prevention of module field failure can consequently decrease investment risks as well as increase the electricity yield. An improved knowledge level can for these...
article 2018
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Theelen, M.J. (author), de Graaf, F. (author), Daume, F. (author), Barreau, N. (author), Vroon, Z.A.E.P. (author), Zeman, M. (author)
Degradation rates and mechanisms for molybdenum back contacts and ZnO:Al front contacts exposed to damp heat were obtained from literature and experiments. It was found that molybdenum back contacts with a higher density and covered by a MoSe2 film are more stable than their low density, bare counterparts. For ZnO:Al front contacts various...
conference paper 2018
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Theelen, M. (author), Beyeler, K. (author), Steijvers, H. (author), Barreau, N. (author)
Unencapsulated CIGS solar cells were simultaneously exposed to either dry or damp heat combined illumination. In-situ monitoring of their electrical parameters demonstrated a rapid decrease of the efficiency for the solar cells exposed to damp heat plus illumination. This decrease was mainly driven by changes in the shunt resistances, affecting...
article 2017
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Theelen, M. (author), de Amorim Soares, G. (author), Beyeler, K. (author), Steijvers, H. (author), Barreau, N. (author)
Unpackaged CIGS solar cells were simultaneously exposed to illumination and either dry heat, damp heat or dry cold followed by thermal cycling. In-situ monitoring of their electrical parameters demonstrated a rapid decrease of the efficiency for the solar cells exposed to damp heat plus illumination. This decrease was mainly driven by changes in...
conference paper 2017
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Theelen, M. (author), Liakopoulou, A. (author), Hans, V. (author), Daume, F. (author), Steijvers, H. (author), Barreau, N. (author), Vroon, Z. (author), Zeman, M. (author)
Two types of Cu(In,Ga)Se2 (CIGS) solar cells, both designed for implementation in CIGS modules, were subjected to temperatures between 25C and 105C. Simultaneous exposure to AM1.5 illumination allowed the measurement of their electrical parameters at these temperatures. These two types of solar cells, produced with different deposition routes on...
article 2017
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Theelen, M. (author), Hendrikx, R. (author), Barreau, N. (author), Steijvers, H. (author), Böttger, A. (author)
Unencapsulated CIGS solar cells were simultaneously exposed to damp heat and illumination. In-situ monitoring of their electrical parameters demonstrated a rapid decrease of the efficiency, mainly driven by changes in the series and shunt resistances. The non-degraded and degraded solar cells were studied by SIMS and XRD to investigate the...
article 2016
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Theelen, M. (author), Steijvers, H. (author), Bakker, K. (author), Vink, J. (author), Mortazavi, S. (author), Mulder, A. (author), Barreau, N. (author), Roosen, D. (author), Haverkamp, E. (author)
Two hybrid degradation setups, allowing exposure of solar cells and modules to elevated temperatures and humidity as well as illumination have been built. CIGS solar cells were placed in the degradation setups, allowing real time monitoring of their electrical properties. Under open circuit conditions, the efficiency of alkali-rich CIGS solar...
conference paper 2016
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Theelen, M. (author), de Graaf, F. (author), Daume, F. (author), Barreau, N. (author), Vroon, Z. (author), Zeman, M. (author)
Degradation rates and mechanisms for molybdenum back contacts and ZnO:Al front contacts exposed to damp heat were obtained from literature and experiments. It was found that molybdenum back contacts with a higher density and covered by a MoSe2 film are more stable than their low density, bare counterparts. For ZnO:Al front contacts, various...
conference paper 2016
document
Theelen, M. (author), Barreau, N. (author), Hans, V. (author), Steijvers, H. (author), Vroon, Z. (author), Zeman, M. (author)
Non-encapsulated CIGS solar cells with different contents of sodium (Na) and potassium (K) were simultaneously exposed to damp heat and illumination. The solar cells with higher alkali (Na, K) content exhibited higher initial conversion efficiencies, but degraded severely within 100 hours, while samples with a lower alkali content retained their...
conference paper 2015
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Theelen, M. (author), Hans, V. (author), Barreau, N. (author), Steijvers, H. (author), Vroon, Z. (author), Zeman, M. (author)
Unencapsulated CIGS solar cells with high and low contents of sodium (Na) and potassium (K) were simultaneously exposed to damp heat and illumination. The solar cells with a high alkali (Na, K) content exhibited higher initial conversion efficiencies, but degraded severely within 100-h, while the alkali poor samples kept relatively stable...
article 2015
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Theelen, M. (author), Foster, C. (author), Steijvers, H. (author), Barreau, N. (author), Frijters, C. (author), Vroon, Z. (author), Zeman, M. (author)
CIGS solar cells and non-covered molybdenum areas and scribes were exposed to liquid water purged with the atmospheric gases carbon dioxide (CO2), oxygen (O2), nitrogen (N2) and air in order to investigate their degradation behavior. The samples were analyzed by electrical, compositional and optical measurements before, during and after exposure...
conference paper 2015
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Theelen, M. (author), Harel, S. (author), Verschuren, M. (author), Tomassini, M. (author), Hovestad, A. (author), Barreau, N. (author), van Berkum, J. (author), Vroon, Z. (author), Zeman, M. (author)
The degradation behavior of Mo/MoSe2 layers have been investigated using damp heat exposure. The two studied molybdenum based films with different densities and microstructures were obtained by lifting off Cu(In,Ga)Se2 layers froma bilayer molybdenum stack on soda lime glass. Hereby, a glass/Mo/MoSe2 was obtained, which resembles the back...
conference paper 2015
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Theelen, M. (author), Foster, C. (author), Steijvers, H. (author), Barreau, N. (author), Vroon, Z. (author), Zeman, M. (author)
CIGS solar cells were exposed to liquid water purged with the atmospheric gases carbon dioxide (CO<inf>2</inf>), oxygen (O<inf>2</inf>), nitrogen (N<inf>2</inf>) and air in order to investigate their chemical degradation behavior. The samples were analyzed by electrical, compositional and optical measurements before, during and after exposure in...
article 2015
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Theelen, M. (author), Steijvers, H. (author), Barreau, N. (author), Buffiere, M. (author), Brammertz, G. (author), Flammini, M.G. (author), van Vugt, R.J. (author), Vroon, Z. (author), Zeman, M. (author)
A 'hybrid' degradation setup, which allows the use of humidity, temperature and illumination as loads in order to accelerate degradation of solar cells and modules, has been designed and constructed. In this setup, the current voltage output of photovoltaic samples is automatically logged and the electrical parameters are calculated. This allows...
conference paper 2015
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Theelen, M.J. (author), Barreau, N. (author), Daume, F. (author), Steijvers, H.L.A.H. (author), Hans, V.O. (author), Liakopoulou, A. (author), Vroon, Z.A.E.P. (author), Zeman, M. (author)
An hybrid degradation setup, in which humidity, temperature and illumination are used in order to accelerate degradation of CIGS, has been developed. This setup consists of a climate chamber, which can vary the temperature and humidity. Furthermore, an area of 80x80 cm2 is illuminated, which allows both the study of light induced behvaior and...
conference paper 2014
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