Low temperature deposition of bifacial CIGS solar cells on Al-doped Zinc Oxide back contacts

Cavallari, Nicholas; Pattini, F.; Rampino, Stefano; Annoni, Filippo; Barozzi, M.; Bronzoni, Matteo; Gilioli, E.; Gombia, E.; Maragliano, Carlo; Mazzer, M.; Pepponi, G.; Spaggiari, Giulia; Fornari, R.

doi:10.1016/j.apsusc.2017.03.242

Cited by 41 publications

(34 citation statements)

References 19 publications

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“…The “Ref” samples show an increasing collection probability with increasing wavelength at back side illumination. This is typically observed in EQE spectra if the diffusion length and/or the back contact recombination are limiting . With increasing IOH thickness, the absolute level increases by a similar value for all wavelengths (ie, generation depths).…”

Section: Resultsmentioning

confidence: 99%

Bifacial Cu(In,Ga)Se₂ solar cells using hydrogen‐doped In₂O₃ films as a transparent back contact

Keller

Chen

Riekehr

et al. 2018

Progress in Photovoltaics

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Hydrogen-doped In 2 O 3 (IOH) films are used as a transparent back contact in bifacial Cu(In,Ga)Se 2 (CIGS) solar cells. The effect of the IOH thickness and the impact of the sodium incorporation technique on the photovoltaic parameters are studied, and clear correlations are observed. It is shown that a loss in short circuit current density (J SC ) is the major limitation at back side illumination. The introduction of a thin Al 2 O 3 layer on top of the IOH significantly increases the collection efficiency (ϕ(x)) for electrons generated close to the back contact. In this way, the J SC loss can be mitigated to only~25% as compared with front side illumination. The Al 2 O 3 film potentially reduces the interface defect density or, alternatively, creates a field effect passivation. In addition, it prevents the excessive formation of Ga 2 O 3 at the CIGS/ IOH interface, which is found otherwise when a NaF layer is added before absorber deposition. Consequently, detrimental redistributions in Ga and In close to the back contact can be avoided. Finally, a bifacial CIGS solar cell with an efficiency (η) of η = 11.0% at front and η = 6.0% at back side illumination could be processed. The large potential for further improvements is discussed.

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Section: Resultsmentioning

confidence: 99%

Bifacial Cu(In,Ga)Se₂ solar cells using hydrogen‐doped In₂O₃ films as a transparent back contact

Keller

Chen

Riekehr

et al. 2018

Progress in Photovoltaics

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“…Recent reports of bifacial CIGSe solar cells on ZnO also exist albeit with comparatively lower efficiencies. [ 6 ]…”

Section: Introductionmentioning

confidence: 99%

Over 10% Efficient Wide Bandgap CIGSe Solar Cells on Transparent Substrate with Na Predeposition Treatment

et al. 2020

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With the recent rise of new photovoltaic applications, it has become necessary to develop specific optoelectronic properties for thin‐film technologies such as Cu(In,Ga)Se2 and to take advantage of their high degree of tunability. The feasibility of efficient wide bandgap absorbers on transparent conductive oxide substrates is, in that context, of critical importance. Using an original approach based on a predeposition sodium treatment, Cu(In,Ga)Se2 absorbers fabricated by sputtering and reactive annealing with a Ga to (Ga + In) content over 0.7 and an optical bandgap above 1.4 eV are deposited on transparent fluorine‐doped tin oxide films, with the insertion of an ultrathin MoSe2 layer preserving the contact's ohmicity. Different material characterizations are carried out, and a thorough Raman analysis of the absorber reveals that the sodium pretreatment significantly enhances the Ga incorporation into the chalcopyrite matrix, along with markedly improving the film's morphology and crystalline quality. This translates to a spectacular boost of the photovoltaic performance for the resulting solar cell as compared with a reference device without Na, specifically in the voltage and fill factor. Eventually, an efficiency exceeding 10% is obtained without antireflection coating, a record value bridging the gap with the state of the art on nontransparent substrates.

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“…Besides the thin film, flexible solar cells, it is worth recalling that there are other innovative devices with promising applications in the fields of BIPV and PIPV, such as the thin film semi-transparent bi-facial solar cells, where the PV conversion efficiency can be significantly increased by collecting light from both front and rear side of the solar cell. Again, by combining the low temperature PED and the use of unconventional transparent substrates, innovative PV products can be developed [24,25].…”

Section: Conclusion and Future Researchmentioning

confidence: 99%

CIGS-Based Flexible Solar Cells

Gilioli

Albonetti

Bissoli

et al. 2019

Factories of the Future

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This chapter reports the progress on the fabrication of thin film CIGSbased solar cells by means of the low temperature pulsed electron deposition technique. The innovative and multidisciplinary approach aims to solve the main issues preventing a possible industrial scale up of the process, i.e. the need of a fast, reliable and automated process, suitable for both static and dynamic deposition of CIGS solar cells on flexible substrates. The final goal is to open new opportunities, particularly in the emerging field of the building-integrated photovoltaic.

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Low temperature deposition of bifacial CIGS solar cells on Al-doped Zinc Oxide back contacts

Cited by 41 publications

References 19 publications

Bifacial Cu(In,Ga)Se₂ solar cells using hydrogen‐doped In₂O₃ films as a transparent back contact

Bifacial Cu(In,Ga)Se₂ solar cells using hydrogen‐doped In₂O₃ films as a transparent back contact

Over 10% Efficient Wide Bandgap CIGSe Solar Cells on Transparent Substrate with Na Predeposition Treatment

CIGS-Based Flexible Solar Cells

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Low temperature deposition of bifacial CIGS solar cells on Al-doped Zinc Oxide back contacts

Cited by 41 publications

References 19 publications

Bifacial Cu(In,Ga)Se2 solar cells using hydrogen‐doped In2O3 films as a transparent back contact

Bifacial Cu(In,Ga)Se2 solar cells using hydrogen‐doped In2O3 films as a transparent back contact

Over 10% Efficient Wide Bandgap CIGSe Solar Cells on Transparent Substrate with Na Predeposition Treatment

CIGS-Based Flexible Solar Cells

Contact Info

Product

Resources

About

Bifacial Cu(In,Ga)Se₂ solar cells using hydrogen‐doped In₂O₃ films as a transparent back contact

Bifacial Cu(In,Ga)Se₂ solar cells using hydrogen‐doped In₂O₃ films as a transparent back contact