Vacancy-Ordered Double Perovskite Cs2TeI6 Thin Films for Optoelectronics
| Autor: | Wei Xie, Tim D. Veal, Lefteris Danos, Max Birkett, Mark Asta, Oliver S. Hutter, Ken Durose, Silvia Mariotti, Pabitra K. Nayak, Henry J. Snaith, Matthew Sherburne, Theodore D. C. Hobson, Isabel Vázquez-Fernández, Laurie J. Phillips |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Band gap H600 General Chemical Engineering 02 engineering and technology 010402 general chemistry 01 natural sciences Article F900 Surface conductivity symbols.namesake Engineering Vacancy defect Materials Chemistry Work function Thin film Materials G100 Spin coating Rietveld refinement business.industry G900 General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical Sciences symbols Optoelectronics 0210 nano-technology business Raman spectroscopy |
| Zdroj: | Chemistry of Materials Chemistry of materials : a publication of the American Chemical Society, vol 32, iss 15 |
| ISSN: | 0897-4756 |
| DOI: | 10.1021/acs.chemmater.0c02150 |
| Popis: | Alternatives to lead- and tin-based perovskites for photovoltaics and optoelectronics are sought that do not suffer from the disadvantages of toxicity and low device efficiency of present-day materials. Here we report a study of the double perovskite Cs2TeI6, which we have synthesized in the thin film form for the first time. Exhaustive trials concluded that spin coating CsI and TeI4 using an antisolvent method produced uniform films, confirmed as Cs2TeI6 by XRD with Rietveld analysis. They were stable up to 250 °C and had an optical band gap of ∼1.5 eV, absorption coefficients of ∼6 × 104 cm-1, carrier lifetimes of ∼2.6 ns (unpassivated 200 nm film), a work function of 4.95 eV, and a p-type surface conductivity. Vibrational modes probed by Raman and FTIR spectroscopy showed resonances qualitatively consistent with DFT Phonopy-calculated spectra, offering another route for phase confirmation. It was concluded that the material is a candidate for further study as a potential optoelectronic or photovoltaic material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|