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Cliff-like conduction band offset and KCN-induced recombination barrier enhancement at the CdS/Cu2ZnSnS4 thin-film solar cell heterojunction
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10.1063/1.3663327
/content/aip/journal/apl/99/22/10.1063/1.3663327
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/22/10.1063/1.3663327
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) UPS (left) and IPES (right) spectra of (a) the KCN-CZTS, (b) the CdS/KCN-CZTS, (c) the CZTS, and (d) the CdS/CZTS sample surfaces. The linear extrapolation (red solid lines) of the leading UPS and IPES edges to determine VBM and CBM, respectively, is indicated. The determined VBM, CBM, and surface band gap values are also given.

Image of FIG. 2.
FIG. 2.

(Color online) PES spectra of CdS/KCN-CZTS samples with varying CdS buffer layer thickness. Inset: iibb values derived from the PES data for different element and core level combinations.

Image of FIG. 3.
FIG. 3.

(Color online) Schematic presentation of the band positions at the kesterite and CdS/kesterite sample surfaces and resulting band alignment at the interface. The red schemes and numbers represent the situation for the KCN-etched CZTS absorber. The experimental uncertainty for the VBM and CBM is ±0.10 eV, and that for the Eg Surf and Eg,i values is ±0.15 eV.

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/content/aip/journal/apl/99/22/10.1063/1.3663327
2011-11-29
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Cliff-like conduction band offset and KCN-induced recombination barrier enhancement at the CdS/Cu2ZnSnS4 thin-film solar cell heterojunction
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/22/10.1063/1.3663327
10.1063/1.3663327
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