Secondary phases in Cu 2 ZnSnS 4 films obtained by spray pyrolysis at different substrate temperatures and Cu contents

Babichuk, I.S.; Golovynskyi, Sergii; Брус, В. В.; Babichuk, I.V.; Datsenko, Oleksandr I.; Li, Ji; Xu, Guiwen; Golovynska, Iuliia; Hreshchuk, Oleksandr; Оrletskyi, Ivan G.; Qu, Junle; Yukhymchuk, V.О.; Maryanchuk, P. D.

doi:10.1016/j.matlet.2018.01.010

Cited by 26 publications

(10 citation statements)

References 15 publications

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“…Here, we would like to complete this discussion by considering the evolution of a representative AZTS NC spectrum (Figure 8) with λ exc tuned from UV (325 nm) to IR (785 nm) and discuss two additional effects not mentioned above. NCs [20,[28][29][30][31][32]57]. In the previous subsections (Figures 6b and 7), we already discussed some of the resonant effects and referred to Raman spectra at different λexc (Figures S2 and S3).…”

Section: Resonance Effects In Raman Spectra Of Azts Ncsmentioning

confidence: 95%

“…Using Raman spectroscopy with different λ exc has proven to be a powerful tool for selectively probing both compositional and structural heterogeneities of small colloidal NCs [20,[28][29][30][31][32]57]. In the previous subsections (Figures 6b and 7), we already discussed some of the resonant effects and referred to Raman spectra at different λ exc (Figures S2 and S3).…”

Section: Resonance Effects In Raman Spectra Of Azts Ncsmentioning

confidence: 99%

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Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals

et al. 2021

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The synthesis of (Cu,Ag)-Zn-Sn-S (CAZTS) and Ag-Zn-Sn-S (AZTS) nanocrystals (NCs) by means of “green” chemistry in aqueous solution and their detailed characterization by Raman spectroscopy and several complementary techniques are reported. Through a systematic variation of the nominal composition and quantification of the constituent elements in CAZTS and AZTS NCs by X-ray photoemission spectroscopy (XPS), we identified the vibrational Raman and IR fingerprints of both the main AZTS phase and secondary phases of Ag-Zn-S and Ag-Sn-S compounds. The formation of the secondary phases of Ag-S and Ag-Zn-S cannot be avoided entirely for this type of synthesis. The Ag-Zn-S phase, having its bandgap in near infrared range, is the reason for the non-monotonous dependence of the absorption edge of CAZTS NCs on the Ag content, with a trend to redshift even below the bandgaps of bulk AZTS and CZTS. The work function, electron affinity, and ionization potential of the AZTS NCs are derived using photoelectron spectroscopy measurements.

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Section: Resonance Effects In Raman Spectra Of Azts Ncsmentioning

confidence: 95%

Section: Resonance Effects In Raman Spectra Of Azts Ncsmentioning

confidence: 99%

Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Using Raman spectroscopy with different exc has proven to be a powerful tool for selectively probing both compositional and structural heterogeneities of small colloidal NCs [20,[28][29][30][31][32]57]. In the previous subsections (Figure 6b and Figure 7), we already discussed some of the resonant effects and referred to Raman spectra at different exc (Figure S2-S3).…”

Section: Resonance Effects In Raman Spectra Of Azts Ncsmentioning

confidence: 99%

“…Raman spectroscopy has proved to be a generally accepted structural characterization technique for CZTS and many related compounds, including colloidal NCs [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Besides high sensitivity to secondary (impurity) phases [20,[28][29][30][31][32], Raman spectroscopy requires only tiny amounts of the material for analysis (unlike XRD) and no sample preparation (unlike TEM, which is in addition quite challenging for tiny aqueous NCs). Furthermore, it can probe NCs directly in the as-synthesized solutions.…”

Section: Introductionmentioning

confidence: 99%

Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals

Dzhagan¹,

Selyshchev²,

Havriliuk³

et al. 2021

Preprint

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The variation of the cationic composition in I2-II-IV-VI4 semiconductor compounds is an effective tool for altering their properties in a controlled manner. In particular, a partial substitution of Cu for Ag in kesterite Cu2ZnSnS4 was proposed to suppress Cu-Zn antisite defects and the improve photovoltaic performance. However, the efficiency of this approach may substantially depend on the fabrication route. Here, we report on the synthesis of (Cu,Ag)-Zn-Sn-S (CAZTS) and Ag-Zn-Sn-S (AZTS) nanocrystals (NCs) by means of "green" chemistry in aqueous solution and their detailed characterization by Raman spectroscopy and by several complementary techniques. Through a systematic variation of the nominal composition and quantification of the constituent elements in CAZTS and AZTS NCs by XPS, we identified the vibrational Raman and IR fingerprints of both the main AZTS phase and secondary phases of Ag-Zn-S and Ag-Sn-S compounds (for the first time). The formation of the secondary phases of Ag-S and Ag-Zn-S cannot be avoided entirely for this type of synthesis. The Ag-Zn-S phase, having its bandgap in near infrared range, is the reason of the non-monotonous dependence of the absorption edge of CAZTS NCs on the Ag content, with a trend to redshift even below the bandgaps of bulk AZTS and CZTS.

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“…Some focus on the growth mechanism of CZTS film and give explanations for the formation process of secondary phases [7,8]. Some emphasize how secondary phases affect solar cell performance [9,10]. However, reactions during the fabrication of CZTS films by the nonvacuum method can be significantly different for different approaches due to thermodynamics.…”

Section: Introductionmentioning

confidence: 99%

In-Depth Characterization of Secondary Phases in Cu2ZnSnS4 Film and Its Application to Solar Cells

Zhang

et al. 2019

Nanomaterials

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Secondary phases are common in Cu2ZnSnS4 (CZTS) thin films, which can be fatal to the performance of solar cell devices fabricated from this material. They are difficult to detect by X-Ray diffraction (XRD) because of the weak peak in spectra compared with the CZTS layer. Herein, it was found that in-depth elemental distribution by a secondary ion mass spectroscopy method illustrated uniform film composition in the bulk with slight fluctuation between different grains. X-ray photoelectron spectroscopy (XPS) measurement was conducted after sputtering the layer with different depths. An Auger electron spectrum with Auger parameter were used to check the chemical states of elements and examine the distribution of secondary phases in the CZTS films. Secondary phases of CuS, ZnS and SnS were detected at the surface of the CZTS film within a 50-nm thickness while no secondary phases were discovered in the bulk. The solar cell fabricated with the as-grown CZTS films showed a conversion efficiency of 2.1% (Voc: 514.3 mV, Jsc: 10.4 mA/cm2, FF: 39.3%) with an area of 0.2 cm2 under a 100 mW/cm2 illumination. After a 50-nm sputtering on the CZTS film, the conversion efficiency of the solar cell was improved to 6.2% (Voc: 634.0 mV, Jsc: 17.3 mA/cm2, FF: 56.9%).

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Secondary phases in Cu 2 ZnSnS 4 films obtained by spray pyrolysis at different substrate temperatures and Cu contents

Cited by 26 publications

References 15 publications

Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals

Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals

Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals

In-Depth Characterization of Secondary Phases in Cu2ZnSnS4 Film and Its Application to Solar Cells

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