4.6 Article

Tunable structural and optical properties of CuInS2 colloidal quantum dots as photovoltaic absorbers

期刊

RSC ADVANCES
卷 11, 期 35, 页码 21351-21358

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra03659a

关键词

-

资金

  1. Department of Chemistry, School for Graduate Studies and Research
  2. Office of the Dean, Faculty of Science and Technology, University of the West Indies, St. Augustine campus
  3. TWAS Research Grant (UNESCO) [FR: 324026725]
  4. EPSRC [EP/R022518/1]
  5. EPSRC [EP/R022518/1] Funding Source: UKRI

向作者/读者索取更多资源

In this study, facile phase selective synthesis of CuInS2 (CIS) nanostructures was achieved using hot-injection colloidal synthesis, resulting in temperature-dependent structural variability and short radiative lifetimes of the synthesized quantum dots. The quantum dots also exhibited particle-size dependent tunable band gaps, with further structural and optical tunability achieved with possible time-dependent phase transformation at 180 degrees C.
Facile phase selective synthesis of CuInS2 (CIS) nanostructures has been an important pursuit because of the opportunity for tunable optical properties of the phases, and in this respect is investigated by hot-injection colloidal synthesis in this study. Relatively monodispersed colloidal quantum dots (3.8-5.6 nm) of predominantly chalcopyrite structure synthesized at 140, 180 and 210 degrees C over 60 minutes from copper(ii) hexafluoroacetylacetonate hydrate and indium(iii) diethyldithiocarbamate precursors exhibit temperature-dependent structural variability. The slightly off-stoichiometric quantum dots are copper-deficient in which copper vacancies , indium interstitials , indium-copper anti-sites and surface trapping states are likely implicated in broad photoluminescence emission with short radiative lifetimes, tau(1), tau(2), and tau(3) of 1.5-2.1, 7.8-13.9 and 55.2-70.8 ns and particle-size dependent tunable band gaps between 2.25 and 2.32 eV. Further structural and optical tunability (E-g between 2.03 and 2.28 eV) is achieved with possible time-dependent wurtzite to chalcopyrite phase transformation at 180 degrees C likely involving a dynamic interplay of kinetic and thermodynamic factors.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据