Rational synthesis of (Cu1−xAgx)2ZnSnS4 nanocrystals with low defect and tuning band gap

Chen, Xiaoyan; Wang, Jilei; Zhou, Wenhui; Chang, Zhixian; Kou, Dongxing; Zhou, Zhengji; Tian, Qingwen; Meng, Yin‐Shan

doi:10.1016/j.matlet.2016.06.037

Cited by 17 publications

(11 citation statements)

References 22 publications

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“…The modes that involve cation vibration are not resolved in the present work, but in studies where it was observed as a separate peak, it exhibited a continuous shift toward the low energy side with increasing Ag content, well reflecting the effect of the substitution of Cu + by the heavier and bigger Ag + [65]. Consequently, most of the works on ACZTS nano-or microcrystals reported the main Raman peak in the same frequency range as for CZTS ones, namely 332-338 cm −1 [36,40].…”

Section: Results Of Density Functional Theory Calculationsmentioning

confidence: 45%

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: Results Of Density Functional Theory Calculationsmentioning

confidence: 45%

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

et al. 2021

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“…The E g of co-doped Cu 2 ZnSnS 4 thin film increases with the increasing Ag/(Ag + Cu) ratio due to Ag doping. It is reported that the band gap of Ag single-doped Cu 2 ZnSnS 4 thin film becomes increasingly wide with the increase of Ag concentration [12,13].…”

Section: Resultsmentioning

confidence: 99%

“…Ag doping can occupy the Cu site in the Cu 2 ZnSnS 4 lattice to reduce the harmful Cu Zn anti-site and V Cu defects because the formation energy of Ag Zn defect is higher than that of Cu Zn defect [8,9,10,11]. In addition, the band gap of Cu 2 ZnSnS 4 can be adjusted by Ag doping [12,13].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ag and Mn Co-Doped Cu2ZnSnS4 Thin Film

Qiu

Tian

2019

Nanomaterials

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Ag and Mn dopants were incorporated into Cu2ZnSnS4 thin film to reduce defects in thin film and improve thin film properties. Sol–gel and spin-coating techniques were employed to deposit Ag and Mn co-doped Cu2ZnSnS4 thin films. The structures, compositions, morphologies, and optical properties of the co-doped thin films were characterized. The experimental results indicate the formation of kesterite structure without Ag and Mn secondary phases. The amount of Ag in the thin films is close to that in the sols. The co-doped Cu2ZnSnS4 thin films have an absorption coefficient of larger than 1.3 × 104 cm−1, a direct optical band gap of 1.54–2.14 eV, and enhanced photoluminescence. The nonradiative recombination in Cu2ZnSnS4 thin film is reduced by Ag and Mn co-doping. The experimental results show that Ag and Mn incorporation can improve the properties of Cu2ZnSnS4 thin film.

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“…Most of the Raman studies of CAZTS and AZTS were performed on poly-/microcrystalline films [34][35][36][37][38][39], with only a few reports on colloidal NCs [9,11,40]. There is a noticeable discrepancy in the literature regarding the dependence of the phonon Raman peak position and width on the Ag content in CAZTS, the NC size, or non-stoichiometry [5,39].…”

Section: Introductionmentioning

confidence: 99%

“…There is a noticeable discrepancy in the literature regarding the dependence of the phonon Raman peak position and width on the Ag content in CAZTS, the NC size, or non-stoichiometry [5,39]. With the growing number of reports on the synthesis and applications of colloidal AZTS NCs [6,9,11,33,40,41], the physics and chemistry of defects and structural phases in such NCs need to be explored.…”

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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Rational synthesis of (Cu1−xAgx)2ZnSnS4 nanocrystals with low defect and tuning band gap

Cited by 17 publications

References 22 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

Fabrication of Ag and Mn Co-Doped Cu2ZnSnS4 Thin Film

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

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