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Performance evaluation of multi-junction solar cells by spatially resolved electroluminescence microscopy.

Kong L, Wu Z, Chen S, Cao Y, Zhang Y, Li H, Kang J - Nanoscale Res Lett (2015)

Bottom Line: Meanwhile, we analyzed the relationship between electroluminescence intensity and short-circuit current density J SC.The results indicated that the gray value of the electroluminescence image corresponding to the intensity was almost proportional to J SC.This technology provides a potential way to evaluate the current matching status of multi-junction solar cells.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Fujian Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen, 361005 People's Republic of China.

ABSTRACT
An electroluminescence microscopy combined with a spectroscopy was developed to visually analyze multi-junction solar cells. Triple-junction solar cells with different conversion efficiencies were characterized by using this system. The results showed that the mechanical damages and material defects in solar cells can be clearly distinguished, indicating a high-resolution imaging. The external quantum efficiency (EQE) measurements demonstrated that different types of defects or damages impacted cell performance in various degrees and the electric leakage mostly degraded the EQE. Meanwhile, we analyzed the relationship between electroluminescence intensity and short-circuit current density J SC. The results indicated that the gray value of the electroluminescence image corresponding to the intensity was almost proportional to J SC. This technology provides a potential way to evaluate the current matching status of multi-junction solar cells.

No MeSH data available.


Related in: MedlinePlus

The dependence of mean gray value of EL images onJSC.
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Fig11: The dependence of mean gray value of EL images onJSC.

Mentions: In the experiment, automatic gain adjustment in the image acquisition software is disabled and the injected current was kept at 20 mA. Figure 11 illustrates the dependence of the photocurrent density from each junction on the averaged EL intensity. It can be seen that the current density is almost proportional to EL intensity for both the subcells, which agrees well with Equation 8. This behavior means that we can obtain the current density by EL microscopy technology with the calibrated parameters, and it will provide a simple and effective method for the characterization of the current matching condition of MJ solar cells.Figure 11


Performance evaluation of multi-junction solar cells by spatially resolved electroluminescence microscopy.

Kong L, Wu Z, Chen S, Cao Y, Zhang Y, Li H, Kang J - Nanoscale Res Lett (2015)

The dependence of mean gray value of EL images onJSC.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385041&req=5

Fig11: The dependence of mean gray value of EL images onJSC.
Mentions: In the experiment, automatic gain adjustment in the image acquisition software is disabled and the injected current was kept at 20 mA. Figure 11 illustrates the dependence of the photocurrent density from each junction on the averaged EL intensity. It can be seen that the current density is almost proportional to EL intensity for both the subcells, which agrees well with Equation 8. This behavior means that we can obtain the current density by EL microscopy technology with the calibrated parameters, and it will provide a simple and effective method for the characterization of the current matching condition of MJ solar cells.Figure 11

Bottom Line: Meanwhile, we analyzed the relationship between electroluminescence intensity and short-circuit current density J SC.The results indicated that the gray value of the electroluminescence image corresponding to the intensity was almost proportional to J SC.This technology provides a potential way to evaluate the current matching status of multi-junction solar cells.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Fujian Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen, 361005 People's Republic of China.

ABSTRACT
An electroluminescence microscopy combined with a spectroscopy was developed to visually analyze multi-junction solar cells. Triple-junction solar cells with different conversion efficiencies were characterized by using this system. The results showed that the mechanical damages and material defects in solar cells can be clearly distinguished, indicating a high-resolution imaging. The external quantum efficiency (EQE) measurements demonstrated that different types of defects or damages impacted cell performance in various degrees and the electric leakage mostly degraded the EQE. Meanwhile, we analyzed the relationship between electroluminescence intensity and short-circuit current density J SC. The results indicated that the gray value of the electroluminescence image corresponding to the intensity was almost proportional to J SC. This technology provides a potential way to evaluate the current matching status of multi-junction solar cells.

No MeSH data available.


Related in: MedlinePlus