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<p>Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) nanocrystals have ignited significant scientific and commercial interest due to their favorable optoelectronic properties and earth-abundant constituents. However, synthesizing pure-phase CZTS remains challenging due to its complex phase relationships. In this work, we have synthesized Zn-rich CZTS nanocrystals via hot-injection colloidal method. The tetragonal kesterite phase of CZTS nanocrystals was identified across all Zn concentrations through complementary analyses of X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Energy-dispersive X-ray spectroscopy (EDS) further substantiated near-stoichiometric compositions, with elemental ratios remaining consistent despite systematic variations in Zn. An increase in Zn concentration resulted in a blue shift of the optical band gap, as observed by UV-Visible spectroscopy. Photodetectors fabricated using these Zn-rich CZTS nanocrystals exhibited promising performance, demonstrating a photon responsivity of 8.50 × 10<sup>− 6</sup> A/W, a photon detectivity of 19.20 × 10<sup>5</sup> Jones, a low noise equivalent power of 5.20 × 10<sup>− 4</sup> W/Hz<sup>1/2</sup>, and an external quantum efficiency of 1.92 × 10<sup>− 5</sup>%. These results highlight the potential of Zn-enriched CZTS nanocrystals for high-performance optoelectronic devices.</p>

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Zn‑enriched Cu₂ZnSnS₄ nanocrystals: structure-property optimization for high‑performance energy-relevant photodetectors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月7日

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  • Bharat Bade,
  • Yogesh Hase,
  • Ashish Waghmare,
  • Shruti Shah,
  • Somnath Ladhane,
  • Vidya Doiphode,
  • Ashvini Punde,
  • Pratibha Shinde,
  • Swati Rahane,
  • Dhanashri Kale,
  • Mohit Prasad,
  • Shashikant P. Patole,
  • Sandesh Jadkar

摘要

Cu2ZnSnS4 (CZTS) nanocrystals have ignited significant scientific and commercial interest due to their favorable optoelectronic properties and earth-abundant constituents. However, synthesizing pure-phase CZTS remains challenging due to its complex phase relationships. In this work, we have synthesized Zn-rich CZTS nanocrystals via hot-injection colloidal method. The tetragonal kesterite phase of CZTS nanocrystals was identified across all Zn concentrations through complementary analyses of X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Energy-dispersive X-ray spectroscopy (EDS) further substantiated near-stoichiometric compositions, with elemental ratios remaining consistent despite systematic variations in Zn. An increase in Zn concentration resulted in a blue shift of the optical band gap, as observed by UV-Visible spectroscopy. Photodetectors fabricated using these Zn-rich CZTS nanocrystals exhibited promising performance, demonstrating a photon responsivity of 8.50 × 10− 6 A/W, a photon detectivity of 19.20 × 105 Jones, a low noise equivalent power of 5.20 × 10− 4 W/Hz1/2, and an external quantum efficiency of 1.92 × 10− 5%. These results highlight the potential of Zn-enriched CZTS nanocrystals for high-performance optoelectronic devices.