On the temperature behavior of shunt-leakage currents in Cu(In,Ga)Se2 solar cells: The role of grain boundaries and rear Schottky contact

Sozzi, Giovanna; Menozzi, Roberto; Cavallari, Nicholas; Bronzoni, Matteo; Annoni, Filippo; Calicchio, M.; Mazzer, M.

doi:10.1109/pvsc.2015.7355779

Cited by 5 publications

(1 citation statement)

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“…The variations described above may be explained as follows: At first, low Rsh values are likely due to copper‐enriched grain boundaries—by analogy to CIGSe material, for which grain boundaries have been extensively studied 32–34 . Then, the addition of sodium enables excess copper out‐diffusion from grain boundaries toward the surface where depending on the stage of the process it forms either CIGS or Cu x S; In the latter case, it is subsequently etched by KCN.…”

Section: Resultsmentioning

confidence: 99%

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S₂ for photovoltaic applications: Insights from the investigation of more than 500 samples

Choubrac

Bertin

Pineau

et al. 2023

Progress in Photovoltaics

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The present article discusses the investigation of CuIn1−xGaxS2 (CIGS) thin films for photovoltaic applications. For decades, a Cu‐rich composition has been used to create solar cells with efficiencies of up to 13.5%; however, interest in chalcopyrite sulfide has recently been revived due to its high and adjustable bandgap, making it a serious candidate as a top cell in tandem configurations. Although chalcopyrite selenides share many properties with CIGS thin films, crucial differences have been reported. To further understand these materials, we studied more than 500 samples of absorbers and resulting solar cells. First, we found that the compositional window for obtaining single‐phase CIGS thin films with a three‐stage co‐evaporation process is very narrow. Second, we reported that a combination of low copper content and sodium addition during growth is required to maximize the photoluminescence intensity (i.e., to minimize the absorber‐related open‐circuit voltage losses). Finally, we showed that solar cell performance and stability depend not only on absorber quality but also on phenomena at interfaces (absorber/buffer and grain boundaries). Altogether, we formulate growth recommendations for the manufacture of stable CIGS/CdS solar cells with state‐of‐the‐art efficiency.

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Section: Resultsmentioning

confidence: 99%

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S₂ for photovoltaic applications: Insights from the investigation of more than 500 samples

Choubrac

Bertin

Pineau

et al. 2023

Progress in Photovoltaics

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Two‐ and Three‐Dimensional Electronic Modeling of Thin‐Film Solar Cells

Kanevce

Metzger

2016

Advanced Characterization Techniques for Thin Film Solar Cells

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Back contact based T-CAD model for the N1-signal observed in capacitance spectroscopy in CIGS solar cells

Lauwaert

2024

Solar Energy

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On the temperature behavior of shunt-leakage currents in Cu(In,Ga)Se2 solar cells: The role of grain boundaries and rear Schottky contact

Cited by 5 publications

References 9 publications

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S₂ for photovoltaic applications: Insights from the investigation of more than 500 samples

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S₂ for photovoltaic applications: Insights from the investigation of more than 500 samples

Two‐ and Three‐Dimensional Electronic Modeling of Thin‐Film Solar Cells

Back contact based T-CAD model for the N1-signal observed in capacitance spectroscopy in CIGS solar cells

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On the temperature behavior of shunt-leakage currents in Cu(In,Ga)Se2 solar cells: The role of grain boundaries and rear Schottky contact

Cited by 5 publications

References 9 publications

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S2 for photovoltaic applications: Insights from the investigation of more than 500 samples

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S2 for photovoltaic applications: Insights from the investigation of more than 500 samples

Two‐ and Three‐Dimensional Electronic Modeling of Thin‐Film Solar Cells

Back contact based T-CAD model for the N1-signal observed in capacitance spectroscopy in CIGS solar cells

Contact Info

Product

Resources

About

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S₂ for photovoltaic applications: Insights from the investigation of more than 500 samples

On the role of sodium and copper off‐stoichiometry in Cu (In,Ga)S₂ for photovoltaic applications: Insights from the investigation of more than 500 samples