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Insights on the influence of surface roughness on photovoltaic properties of state of the art copper indium gallium diselenide thin films solar cells
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10.1063/1.4721648
/content/aip/journal/jap/111/11/10.1063/1.4721648
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/11/10.1063/1.4721648
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

SEM images (cross sections, 65° tilt) of (a) standard nonetched (2500 nm) as-deposited CIGSe absorber; and etched CIGSe surfaces after (b) 30 s; (c) 2 min; and (d) 4 min of etching.

Image of FIG. 2.
FIG. 2.

RMS roughness of the CIGSe surface versus etching time of the films.

Image of FIG. 3.
FIG. 3.

High energy resolution (a) Cu 2p, (b) Ga 2p, (c) In 3d, and (d) Se 3d XPS spectra acquired for the CIGSe surface before the etch treatment (gray line) and after 4 min of etching (black line). XPS spectra are normalized in intensity for more clarity.

Image of FIG. 4.
FIG. 4.

(a) X-ray diffraction patterns; (b) Raman spectra of as deposited CIGSe absorber and 4 min etch CIGSe absorbers.

Image of FIG. 5.
FIG. 5.

Evolution of the total reflectivity of the (a) bare CIGSe surface and (b) the completed solar cells stack with different CIGSe roughness.

Image of FIG. 6.
FIG. 6.

Photovoltaic parameters from J(V) characterization for CIGSe solar cells as function of the surface roughness of the CIGSe absorber: (a) Efficiency and short circuit current (Jsc); (b) open circuit voltage (Voc) and fill factor (FF).

Image of FIG. 7.
FIG. 7.

(a) EQE for different etching times; (b): EQE ratio for different etching times.

Image of FIG. 8.
FIG. 8.

IQE for different etching times; inset: fitting of the tail of the IQE for a smooth CIGSe sample.

Image of FIG. 9.
FIG. 9.

Schematic representation of the space charge region for a flat and a rough p-n interface.

Image of FIG. 10.
FIG. 10.

Simulated IQE curves where the space charge region W and the minority carriers diffusion length Ln are varied while keeping W + Ln at a constant value Leff.

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/content/aip/journal/jap/111/11/10.1063/1.4721648
2012-06-06
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Insights on the influence of surface roughness on photovoltaic properties of state of the art copper indium gallium diselenide thin films solar cells
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/11/10.1063/1.4721648
10.1063/1.4721648
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