Influence of Na in Cu2SnS3 film on its physical properties and photovoltaic performances
| Autor: | Hikaru Uegaki, Jakapan Chantana, Takashi Minemoto |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Photoluminescence Energy conversion efficiency Metals and Alloys Analytical chemistry 02 engineering and technology Surfaces and Interfaces Carrier lifetime Substrate (electronics) 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Crystal symbols.namesake law 0103 physical sciences Solar cell Materials Chemistry symbols 0210 nano-technology Raman scattering Monoclinic crystal system |
| Zdroj: | Thin Solid Films. 636:431-437 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2017.06.044 |
| Popis: | Cu 2 SnS 3 (CTS) is the promising absorber of thin-film solar cell due to earth-abandant and non-toxic element. Influence of sodium (Na) on physical properties of CTS layers is investigated. In this work, CTS films with different Na concentrations are fabricated by sulfurizations of NaF/Cu/SnS 2 and Cu/SnS 2 stacked precursors on both soda-lime glass (SLG) and quartz substrates. The Na from NaF precursor layer and SLG substrate is introduced into CTS films. It is demonstrated that Na in forms of Na x CuSnS 3 ( x : 0.5–1.0) and Na 2 S is segregated in the large grain regions of CTS films. The crystal grains are significantly enlarged by Na addition into CTS films. As a result, the carrier lifetime, examined by time-resolved photoluminescence, is enhanced. From Raman scattering measurement, CTS films possess the peaks of monoclinic CTS structure. In addition, Cu 2 Sn 3 S 7 and Na x CuSnS 3 peaks are clearly observed in CTS films with high Na content. Finally, conversion efficiency of CTS thin-film solar cell is strongly enhanced from 0.61 (without Na addition) to 2.01% (with Na addition), mainly attributed to the increases in open-circuit voltage and fill factor through the decrease in carrier recombination. |
| Databáze: | OpenAIRE |
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