Outdoor performance stability and controlled light-soak testing of amorphous silicon multijunction modules at NREL

Mrig, L.; Burdick, J.; Luft, W.; Kroposki, Benjamin

doi:10.1109/wcpec.1994.520014

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Light‐induced degradation of power output is found in a‐Si devices. However, the degradation can be reversed at increased temperatures . According to literature, CdTe modules have shown different behaviour in short‐term and long‐term performance, differing amongst manufacturers , which makes it difficult to define general patterns.…”

Section: Metastable Behaviour Of Photovoltaic Modulesmentioning

confidence: 99%

Performance stability of photovoltaic modules in different climates

Schweiger

Bonilla

Herrmann

et al. 2017

Progress in Photovoltaics

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The current-voltage (I-V) characteristics of 15 different photovoltaic modules are monitored during more than 2 years of operation at four locations (Germany, Italy, India and Arizona) corresponding to four different climate zones. The electrical stability of the photovoltaic modules during the time of outdoor exposure is investigated in terms of measured I-V curve translated to standard test conditions. This translation compensates the influence of module temperature, irradiance, spectral effects and soiling on the I-V curves. The changes of output power after these corrections are attributed to initial consolidation phases, to long-term degradation of the electrical properties and to seasonal cycles associated with metastabilities. Modules made from crystalline Si turn out to show no or only minor effects. Thin-Film modules (CdTe, Cu(In,Ga)Se 2 and thin-film Si) exhibit a wide spread of metastable behaviour with consistent patterns for identical modules in different climates but with significant differences amongst different manufacturers of the same thin-film technology. We show further that this metastable behaviour influences the energy yield of the modules.

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Section: Metastable Behaviour Of Photovoltaic Modulesmentioning

confidence: 99%

Performance stability of photovoltaic modules in different climates

Schweiger

Bonilla

Herrmann

et al. 2017

Progress in Photovoltaics

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“…ETSID showed a small recovery in P MPP_STC_pu values while the NEXUS installation showed a decrease in the P MPP_STC_pu values. The small recovery in the ETSID PV plant is explained by means of the seasonal variations in a-Si:H modules, as reported in [61][62][63]. A thermal annealing phenomenon occurs when a-Si:H modules are exposed to high temperatures (summer months), inducing a reversible process in which the hydrogen atoms return to their original position.…”

Section: Fig 5 P Mpp_pu and P Mpp_stc_pu Values For The Beginning Omentioning

confidence: 82%

Analysis of initial stabilization of cell efficiency in amorphous silicon photovoltaic modules under real outdoor conditions

et al. 2018

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This contribution presents a field study in which the initial stabilization of thin-film amorphous silicon (a-Si:H) is investigated. Two grid-connected a-Si:H photovoltaic plants have been monitored and analyzed under real outdoor conditions. A per-unit approach is proposed to compare PV plants with differences in their electrical characteristic and the start-up date. The representation of a normalized per-unit PV power versus the accumulated incoming irradiation reveals an evolution that can be characterized through an exposure-response function. By this function, two populations of defects in the cells are detected. It is found that the stabilization process in the first year of operation produces a decrease of 10% in the peak power, equivalent to a decrease of 0.5% in cell efficiency. The use of the accumulated PSH for conducting the analysis of the initial stabilization produces similarities that cannot be obtained if a time scale is used. These results provide a powerful tool for PV plant designers because they enable a prediction to be made of the timescale stabilization response in terms of unitary power, correlated with the peak sun hours received. Highlights: PV efficiency stabilization in a-Si:H modules by means of exposure-response function. Dependency of defect populations with accumulated irradiation. Different seasonal effects after initial stabilization depending on start date. Normalization approach to compare different a-Si PV plants. Cell efficiency comparison using flash-report data and experimental values.

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“…One is to analyze light degradation and thermal annealing phenomena (Staebler-Wronski effect) in laboratory [2], [3], [4]. The other is to conduct outdoor exposure tests [5]. Although much work have been doine on the issues, there still exists the pressing needs for practical way of power rating and prediction of energy output at various locations on the globe.…”

Section: Intr0c)uctionmentioning

confidence: 99%

Outdoor performance of triple stacked a-Si photovoltaic module in various geographical locations and climates

Fukae

Lim

Tamechika

et al. 1996

Conference Record of the Twenty Fifth IEEE Photovoltaic Specialists Conference - 1996

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A systematic investigation has been made on output measurement of the a-Si//al-SiGe//a-SiGe triple stacked solar cells. Prototype modules incorporating triple a-Si cells fabricated in high deposition rate plasma CVD process with micro-wave power source[l] have been exposed outdoor for about a half to one year at three different geographical locations to evaluate the outdoor performance under cold, temperate and tropical climates. The results showed that a-Si performed better under higher temperature climate. Energy efficiency over 8% was obtained in Kuala Lumpur. Power rating under 1 sun, 50deg.C light soaking condition seems to be reasonable in Kyoto.

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Outdoor performance stability and controlled light-soak testing of amorphous silicon multijunction modules at NREL

Cited by 7 publications

References 3 publications

Performance stability of photovoltaic modules in different climates

Performance stability of photovoltaic modules in different climates

Analysis of initial stabilization of cell efficiency in amorphous silicon photovoltaic modules under real outdoor conditions

Outdoor performance of triple stacked a-Si photovoltaic module in various geographical locations and climates

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