Microenvironment Created by SnSe<sub>2</sub> Vapor and Pre‐Selenization to Stabilize the Surface and Back Contact in Kesterite Solar Cells

Guo, Jiajia; Mao, Yang; Ao, Jianping; Han, Yanchen; Cao, Chun; Liu, Fangfang; Bi, Jinlian; Wang, Shenghao

doi:10.1002/smll.202203354

Cited by 10 publications

(5 citation statements)

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“…In general, the larger W d is more favorable for carrier collection and separation. [53,54] The K 2 S samples have better crystallinity and lower defect density, besides the superior carrier-carrier transport characteristics due to the doublegradient bandgap structure, which demonstrates better device performance. The DLCP allows a more accurate assessment of the free carriers and deep defect states than the C-V measurement, while the C-V also includes the effect of the interface state in kesterite-based cells.…”

Section: Resultsmentioning

confidence: 99%

Controllable Double Gradient Bandgap Strategy Enables High Efficiency Solution‐Processed Kesterite Solar Cells

Zhao,

Chen,

Ishaq

et al. 2023

Adv Funct Materials

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The double gradient bandgap absorber has the potential to enhance carrier collection, improve light collection efficiency, and make the performance of solar cells more competitive. However, achieving the double gradient bandgap structure is challenging due to the comparable diffusion rates of cations during high‐temperature selenization in kesterite Cu2ZnSn(S,Se)4 (CZTSSe) films. Here, it has successfully achieved a double gradient bandgap in the CZTSSe absorber by spin‐coating the K2S solution during the preparation process of the precursor film. The K2S insertion serves as an additional S source for the absorber, and the high‐affinity energy of K‐Se causes the position of the spin‐coated K2S solution locally Se‐rich and S‐poor. More importantly, the position of the bandgap minimum (notch) and the depth of the notch can be controlled by varying the concentration of K2S solution and its deposition stage, thereby avoiding the electronic potential barrier produced by an inadvertent notch position and depth. In addition, the K─Se liquid phase expedites the selenization process to the elimination of the fine grain layer. The champion CZTSSe device achieved an efficiency of 13.70%, indicating the potential of double gradient bandgap engineering for the future development of high‐efficiency kesterite solar cells.

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Section: Resultsmentioning

confidence: 99%

Controllable Double Gradient Bandgap Strategy Enables High Efficiency Solution‐Processed Kesterite Solar Cells

Zhao,

Chen,

Ishaq

et al. 2023

Adv Funct Materials

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“…8a). 213 Such Sn self-regulation characteristics have enabled the synthesis of CZTSSe films with desirable cation stoichiometry. For example, CZTSSe films were synthesized through Sn-deficient 214 or Sn-free precursor films 215 annealing in a mixed atmosphere of SnS(e) and S(e) vapor.…”

Section: Revisiting the Composition Engineering In Cztssementioning

confidence: 99%

A critical review on rational composition engineering in kesterite photovoltaic devices: self-regulation and mutual synergy

Guo

2023

J. Mater. Chem. A

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“…Introducing a 10 nm-thick Ge layer at the bottom of the metal precursor stack can promote a favorable ternary phase transformation, facilitating the formation of large-sized grains in kesterite thin films . Nevertheless, in situ formation of Cu–Sn–Se is challenging owing to the uncontrollable fluctuations under chalcogenide vapor pressure . Therefore, forming Cu–Sn alloys prior to further sulfo-selenization might be a more effective control mechanism for Sn-related issues, thereby improving the microstructures of kesterite.…”

Section: Introductionmentioning

confidence: 99%

Facile Approach for Metallic Precursor Engineering for Efficient Kesterite Thin-Film Solar Cells

Park,

He,

Jang

et al. 2024

ACS Appl. Mater. Interfaces

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Kesterite-based Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin-film solar cells (TFSCs) are a promising candidate for low-cost, clean energy production owing to their environmental friendliness and the earth-abundant nature of their constituents. However, the advancement of kesterite TFSCs has been impeded by abundant defects and poor microstructure, limiting their performance potential. In this study, we present efficient Ag-alloyed CZTSSe TFSCs enabled by a facile metallic precursor engineering approach. The positioning of the Ag nanolayer in the metallic stacked precursor proves crucial in expediting the formation of Cu−Sn metal alloys during the alloying process. Specifically, Ag-included metallic precursors promote the growth of larger grains and a denser microstructure in CZTSSe thin films compared to those without Ag. Moreover, the improved uniformity of Ag, facilitated by the evaporation deposition technique, significantly suppresses the formation of detrimental defects and related defect clusters. This suppression effectively reduces nonradiative recombination, resulting in enhanced performance in kesterite TFSCs. This study not only introduces a metallic precursor engineering strategy for efficient kesterite-based TFSCs but also accelerates the development of microstructure evolution from metallic stacked precursors to metal chalcogenide compounds.

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Microenvironment Created by SnSe₂ Vapor and Pre‐Selenization to Stabilize the Surface and Back Contact in Kesterite Solar Cells

Abstract: Figure 9. Photovoltaic device properties of the best CZTSSe solar cell (sample #L, Sn-poor) produced through the two-step selenization process, with the SnSe 2 /(Se+SnSe 2 ) ratio of 6.0%. a) J-V curve and b) EQE response (insets: E g calculated from EQE).

Cited by 10 publications

References 77 publications

Controllable Double Gradient Bandgap Strategy Enables High Efficiency Solution‐Processed Kesterite Solar Cells

Controllable Double Gradient Bandgap Strategy Enables High Efficiency Solution‐Processed Kesterite Solar Cells

A critical review on rational composition engineering in kesterite photovoltaic devices: self-regulation and mutual synergy

Facile Approach for Metallic Precursor Engineering for Efficient Kesterite Thin-Film Solar Cells

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Microenvironment Created by SnSe2 Vapor and Pre‐Selenization to Stabilize the Surface and Back Contact in Kesterite Solar Cells

Abstract: Figure 9. Photovoltaic device properties of the best CZTSSe solar cell (sample #L, Sn-poor) produced through the two-step selenization process, with the SnSe 2 /(Se+SnSe 2 ) ratio of 6.0%. a) J-V curve and b) EQE response (insets: E g calculated from EQE).

Cited by 10 publications

References 77 publications

Controllable Double Gradient Bandgap Strategy Enables High Efficiency Solution‐Processed Kesterite Solar Cells

Controllable Double Gradient Bandgap Strategy Enables High Efficiency Solution‐Processed Kesterite Solar Cells

A critical review on rational composition engineering in kesterite photovoltaic devices: self-regulation and mutual synergy

Facile Approach for Metallic Precursor Engineering for Efficient Kesterite Thin-Film Solar Cells

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Product

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Microenvironment Created by SnSe₂ Vapor and Pre‐Selenization to Stabilize the Surface and Back Contact in Kesterite Solar Cells