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<p>Silver-doped CdTe quantum dots (Ag:CdTe QDs) and their core/shell derivatives with thin CdS and ZnS layers (Ag:CdTe/X, X = CdS or ZnS) were synthesized via a colloidal route and systematically characterized. X-ray diffraction confirmed a cubic zinc-blende phase for all samples. Ag incorporation altered CdTe growth from octahedral to cubic by suppressing the (111) orientation and enhancing the (200) facet, slightly reducing crystallinity. CdS shell deposition partially restored the (111) orientation, while ZnS shells further recovered structural features resembling pristine CdTe QDs. High-resolution TEM revealed ~ 3.7&#xa0;nm Ag:CdTe cores with ~ 0.7–1.4&#xa0;nm shell thicknesses. Optical measurements showed redshifts in absorption (650–750&#xa0;nm) and emission (538–604&#xa0;nm), with a bandgap reduction from 2.11 to 1.83&#xa0;eV. Photovoltaic studies demonstrated that Ag-doping increased the power conversion efficiency (PCE) ~ 64% via enhanced band-edge absorption and acceptor-like states promoting charge separation. CdS and ZnS shells further enhanced PCEs to 3.27% (~ 179% increase) and 2.96% (~ 153% increase), enabled by quasi-Type-II and Type-I band alignments, respectively. These results highlight the synergistic impact of Ag-doping and core/shell engineering in improving QDSSC performance and emphasize&#xa0;the need for further optimization of shell thickness, surface passivation, and device architecture to achieve higher efficiencies.</p>

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Enhanced photovoltaic performance via structural and optoelectronic modulation of Ag:CdTe quantum dots with CdS and ZnS shells

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Vijayaraj Venkatachalam,
  • Sasikala Ganapathy,
  • Ilaiyaraja Perumal,
  • Santhosh Jeferson Joseph Stanley,
  • Arunkumar Thirugnanasambandam,
  • Krishna Prakash Arunachalam

摘要

Silver-doped CdTe quantum dots (Ag:CdTe QDs) and their core/shell derivatives with thin CdS and ZnS layers (Ag:CdTe/X, X = CdS or ZnS) were synthesized via a colloidal route and systematically characterized. X-ray diffraction confirmed a cubic zinc-blende phase for all samples. Ag incorporation altered CdTe growth from octahedral to cubic by suppressing the (111) orientation and enhancing the (200) facet, slightly reducing crystallinity. CdS shell deposition partially restored the (111) orientation, while ZnS shells further recovered structural features resembling pristine CdTe QDs. High-resolution TEM revealed ~ 3.7 nm Ag:CdTe cores with ~ 0.7–1.4 nm shell thicknesses. Optical measurements showed redshifts in absorption (650–750 nm) and emission (538–604 nm), with a bandgap reduction from 2.11 to 1.83 eV. Photovoltaic studies demonstrated that Ag-doping increased the power conversion efficiency (PCE) ~ 64% via enhanced band-edge absorption and acceptor-like states promoting charge separation. CdS and ZnS shells further enhanced PCEs to 3.27% (~ 179% increase) and 2.96% (~ 153% increase), enabled by quasi-Type-II and Type-I band alignments, respectively. These results highlight the synergistic impact of Ag-doping and core/shell engineering in improving QDSSC performance and emphasize the need for further optimization of shell thickness, surface passivation, and device architecture to achieve higher efficiencies.