Increased homogeneity and open-circuit voltage of Cu(In,Ga)Se2 solar cells due to higher deposition temperature

Haarstrich, J.; Metzner, H.; Oertel, Michael; Ronning, Carsten; Rissom, T.; Kaufmann, Christian A.; Unold, Thomas; Schock, Hans‐Werner; Windeln, Johannes; Mannstadt, W.; Rudigier‐Voigt, Eveline

doi:10.1016/j.solmat.2010.10.021

Cited by 42 publications

(24 citation statements)

References 15 publications

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“…A similar behavior that a higher process temperature leads to a reduced Ga gradient and thus to an improved conversion efficiency was also observed for coevaporated solar cells. 19 Our results clearly show that for sequentially produced solar cells the substrate temperature during the first selenization stage has a very similar effect on the GGI than the substrate temperature of the coevaporation process despite their very different reaction kinetics. A more homogeneous Ga gradient and hence a higher efficiency was also obtained for solar cells produced in a modified sequential process by adding a lowtemperature pre-heating stage.…”

mentioning

confidence: 61%

Improved Ga grading of sequentially produced Cu(In,Ga)Se2 solar cells studied by high resolution X-ray fluorescence

Schöppe

Schnohr

Oertel

et al. 2015

Applied Physics Letters

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There is particular interest to investigate compositional inhomogeneity of Cu(In,Ga)Se2 solar cell absorbers. We introduce an approach in which focused ion beam prepared thin lamellas of complete solar cell devices are scanned with a highly focused synchrotron X-ray beam. Analyzing the resulting fluorescence radiation ensures high resolution compositional analysis combined with high spatial resolution. Thus, we are able to detect subtle variations of the Ga/(Ga + In) ratio down to 0.01 on a submicrometer scale. We observed that for sequentially processed solar cells a higher selenization temperature leads to absorbers with almost homogenous Ga/(Ga + In) ratio, which significantly improved the conversion efficiency.

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mentioning

confidence: 61%

Improved Ga grading of sequentially produced Cu(In,Ga)Se2 solar cells studied by high resolution X-ray fluorescence

Schöppe

Schnohr

Oertel

et al. 2015

Applied Physics Letters

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“…Further details of the setup have been described in a recent article. [ 9,10,24 ] Current-potential measurements were performed in 0.5 M H 2 SO 4 versus Ag/AgCl reference electrode at a scan rate of 5 mV s −1…”

Section: Methodsmentioning

confidence: 99%

Efficient and Stable TiO₂:Pt–Cu(In,Ga)Se₂ Composite Photoelectrodes for Visible Light Driven Hydrogen Evolution

Azarpira

Lublow

Steigert

et al. 2015

Advanced Energy Materials

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Novel thin film composite photocathodes based on device‐grade Cu(In,Ga)Se2 chalcopyrite thin film absorbers and transparent conductive oxide Pt‐implemented TiO2 layers on top are presented for an efficient and stable solar‐driven hydrogen evolution. Thin films of phase‐pure anatase TiO2 are implemented with varying Pt‐concentrations in order to optimize simultaneously i) conductivity of the films, ii) electrocatalytic activity, and iii) light‐guidance toward the chalcopyrite. Thereby, high incident‐photon‐to‐current‐efficiencies of more than 80% can be achieved over the full visible light range. In acidic electrolyte (pH 0.3), the most efficient Pt‐implemented TiO2–Cu(In,Ga)Se2 composite electrodes reveal i) photocurrent densities up to 38 mA cm−2 in the saturation region (−0.4 V RHE, reversible hydrogen electrode), ii) 15 mA cm−2 at the thermodynamic potential for H2‐evolution (0 V RHE), and iii) an anodic onset potential shift for the hydrogen evolution (+0.23 V RHE). It is shown that the gradual increase of the Pt‐concentration within the TiO2 layers passes through an efficiency‐ and stability‐maximum of the device (5 vol% of Pt precursor solution). At this maximum, optimized light‐incoupling into the device‐grade chalcopyrite light‐absorber as well as electron conductance properties within the surface layer are achieved while no degradation are observed over more than 24 h of operation.

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“…Specialty glasses have been explored by several CIGSe research groups and the focus was given to high-temperature glasses [99,100], i.e. glasses with higher strain and softening temperatures.…”

Section: Specialty Glassesmentioning

confidence: 99%

Incorporation of alkali metals in chalcogenide solar cells

Salomé

Rodríguez-Alvarez

Sadewasser

2015

Solar Energy Materials and Solar Cells

123

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Increased homogeneity and open-circuit voltage of Cu(In,Ga)Se2 solar cells due to higher deposition temperature

Cited by 42 publications

References 15 publications

Improved Ga grading of sequentially produced Cu(In,Ga)Se2 solar cells studied by high resolution X-ray fluorescence

Improved Ga grading of sequentially produced Cu(In,Ga)Se2 solar cells studied by high resolution X-ray fluorescence

Efficient and Stable TiO₂:Pt–Cu(In,Ga)Se₂ Composite Photoelectrodes for Visible Light Driven Hydrogen Evolution

Incorporation of alkali metals in chalcogenide solar cells

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Increased homogeneity and open-circuit voltage of Cu(In,Ga)Se2 solar cells due to higher deposition temperature

Cited by 42 publications

References 15 publications

Improved Ga grading of sequentially produced Cu(In,Ga)Se2 solar cells studied by high resolution X-ray fluorescence

Improved Ga grading of sequentially produced Cu(In,Ga)Se2 solar cells studied by high resolution X-ray fluorescence

Efficient and Stable TiO2:Pt–Cu(In,Ga)Se2 Composite Photoelectrodes for Visible Light Driven Hydrogen Evolution

Incorporation of alkali metals in chalcogenide solar cells

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About

Efficient and Stable TiO₂:Pt–Cu(In,Ga)Se₂ Composite Photoelectrodes for Visible Light Driven Hydrogen Evolution