Effects of alkali-metal block layer to enhance Na diffusion into Cu(in,Ga)Se2 absorber on flexible solar cells

Moriwaki, Kenichi; Nomoto, Maki; Ishizuka, Shogo; Mukai, Atsushi; Sato, Keigo; Kobayashi, Hiroyuki; Niki, Shigeru

doi:10.1016/j.solmat.2014.10.039

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…[15][16][17] To reduce the gap between theoretical PCE and the current status of CIGS (CIGSSe) solar cells, clear understanding of the defect physics is of importance. Alkali metal is well-known to play an important role to improve device performance for CIGS solar cells, [18][19][20][21] and potassium (K) treatment (such as potassium fluoride, KF) is believed to be the most commonly used and effective method to enhance PCE. 7,22,23) However, the mechanism of K post-deposition treatment to CIGSSe solar cells is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Influence of potassium treatment on electronic properties of Cu(In₁₋ _x Ga _x )(Se₁₋ _y S _y )₂ solar cells studied by steady state photo-capacitance and admittance spectroscopy

Wang¹,

Hao²,

Islam³

et al. 2018

Jpn. J. Appl. Phys.

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To clarify the mechanism of efficiency enhancement effect by potassium (K) treatment for Cu(In1−xGax)(Se1−ySy)2 (CIGSSe) solar cells, we investigated the physical properties of deep and shallow defect levels of CIGSSe solar cells without or with potassium fluoride treatment via using steady state photo-capacitance and admittance spectroscopy. The results show that the defect density of deep levels (such as 0.8 and 0.7 eV above valance band) are similar, suggesting that the K treatment does not drastically change the deep defect properties. For the shallow levels, the activation energy of interface-related shallow defect decreased from 183 to 120 meV upon K treatment, suggesting the modification of interface. The modified interface may be caused by the diffusion of potassium to grain boundaries and the formation of Cu-depleted layer in the near surface region of CIGSSe, resulting in the prolonged minority carrier lifetime. A new level with activation energy of 250 meV was found after K treatment, and it contributed to the increase of carrier density. These features well explained the enhanced device performance of CIGSSe solar cells by K treatment in terms of defects.

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Section: Introductionmentioning

confidence: 99%

Influence of potassium treatment on electronic properties of Cu(In₁₋ _x Ga _x )(Se₁₋ _y S _y )₂ solar cells studied by steady state photo-capacitance and admittance spectroscopy

Wang¹,

Hao²,

Islam³

et al. 2018

Jpn. J. Appl. Phys.

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“…39,40 On the other hand, they are key ingredients in a wealth of technological applications a) Electronic mail: ikeda.takashi@jaea.go.jp from electrocatalysis 41 to solar cells. 42 One of the most fundamental phenomena of alkali cations in aquatic physicalchemistry is their structure making and breaking properties. 1,9 In fact, alkali metal ions are known to enhance or weaken the structuring of the hydrogen-bond (H-bond) network formed by H 2 O molecules depending on the solvated ionic species and their concentrations.…”

Section: Introductionmentioning

confidence: 99%

Role of van der Waals corrections in first principles simulations of alkali metal ions in aqueous solutions

Ikeda

Boero

2015

The Journal of Chemical Physics

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By resorting to a novel implementation of the first-principles-based van der Waals correction (vdWC) based on maximally localized Wannier functions (MLWFs), we inspect its performance and assess its reliability for aqueous solutions of alkali metal ions. In our implementation of vdWCs, an efficient extrapolation scheme is introduced to allow for affordable first principles molecular dynamics avoiding the explicit recalculation of MLWFs at each step. We find that vdWCs, when added to the widely used revPBE gradient corrected functional, influence substantially both structural and dynamical properties of water molecules, with particular emphasis on the hydration shell of the alkali cations. These effects are more evident for strong structure-making and -breaking cationic species. Moreover, self-diffusion coefficients and reorientation correlation times of solvating water molecules change systematically, showing a trend in better agreement with experiments with respect to simulations neglecting the long-range dispersion contributions.

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Section: Kesterite-based Tfscsmentioning

confidence: 96%

“…[ 117 ] At present, flexible TFSC based on CIGS thin film has shown the efficiencies of 20.4% on polyimide (PI) substrate, 18.64% on Mo foil substrate, and 17.7% on SS foil substrate. [ 118 ] In contrast, the kesterite‐based flexible TFSC achieved the efficiency of over 10% (area: 0.5 cm 2 ). Similar to CIGS and Si TFSCs, various flexible substrates such as molybdenum (Mo) foil, flexible glass, titanium (Ti) foil, flexible PI film, tungsten (W), and aluminum (Al) foil have been reported for the fabrication of kesterite CZTS/CZTSe/CZTSSe flexible SCs.…”

Section: Applications Of Kesteritesmentioning

confidence: 99%

Potential Role of Kesterites in Development of Earth‐Abundant Elements‐Based Next Generation Technology

et al. 2021

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Recently, Cu2ZnSn(S,Se)4 (CZTSSe)‐based kesterite thin films have received growing attention in a wide variety of fields due to their suitable physico‐chemical asset nano‐ and micro‐scale. The low elemental cost, earth abundance, and environment‐friendly nature have widened the scope and made it a potential material for developing next‐generation technology. The kesterite thin films have already shown their potential in thin‐film photovoltaics (PVs) with a record efficiency of nearly 12.6%. Apart from solar cells, they have also demonstrated their widespread applicability in the field of photodetectors, gas sensors, thermoelectrics, solar water splitting, energy storage, humidity sensors, antibacterial activities, and many more. This review aims to present an overview of the advancement in the CZTSSe‐based kesterite thin films in terms of synthesis, material properties, and their use in various applications. A comprehensive review of each device application contains ongoing progress, device fabrication, and related issues. Furthermore, this review emphasizes kesterite materials and possible solutions to proposed pitfalls, thus strengthening kesterite's perspective.

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Effects of alkali-metal block layer to enhance Na diffusion into Cu(in,Ga)Se2 absorber on flexible solar cells

Cited by 12 publications

References 10 publications

Influence of potassium treatment on electronic properties of Cu(In₁₋ _x Ga _x )(Se₁₋ _y S _y )₂ solar cells studied by steady state photo-capacitance and admittance spectroscopy

Influence of potassium treatment on electronic properties of Cu(In₁₋ _x Ga _x )(Se₁₋ _y S _y )₂ solar cells studied by steady state photo-capacitance and admittance spectroscopy

Role of van der Waals corrections in first principles simulations of alkali metal ions in aqueous solutions

Potential Role of Kesterites in Development of Earth‐Abundant Elements‐Based Next Generation Technology

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Effects of alkali-metal block layer to enhance Na diffusion into Cu(in,Ga)Se2 absorber on flexible solar cells

Cited by 12 publications

References 10 publications

Influence of potassium treatment on electronic properties of Cu(In1− x Ga x )(Se1− y S y )2 solar cells studied by steady state photo-capacitance and admittance spectroscopy

Influence of potassium treatment on electronic properties of Cu(In1− x Ga x )(Se1− y S y )2 solar cells studied by steady state photo-capacitance and admittance spectroscopy

Role of van der Waals corrections in first principles simulations of alkali metal ions in aqueous solutions

Potential Role of Kesterites in Development of Earth‐Abundant Elements‐Based Next Generation Technology

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Product

Resources

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Influence of potassium treatment on electronic properties of Cu(In₁₋ _x Ga _x )(Se₁₋ _y S _y )₂ solar cells studied by steady state photo-capacitance and admittance spectroscopy

Influence of potassium treatment on electronic properties of Cu(In₁₋ _x Ga _x )(Se₁₋ _y S _y )₂ solar cells studied by steady state photo-capacitance and admittance spectroscopy