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Thermoelectric properties of bismuth-selenide films with controlled morphology and texture grown using pulsed laser deposition
| Content Provider | Semantic Scholar |
|---|---|
| Author | Le, Phuoc Huu Liao, Chien-Neng Luo, Chih-Wei Lin, Jiunn Yuan Leu, Jihperng |
| Copyright Year | 2013 |
| Abstract | Abstract Polycrystalline, thermoelectric thin films of bismuth selenide (Bi 2 Se 3 ) were grown on SiO 2 /Si (1 1 1) substrates, using pulsed laser deposition (PLD). Bi 2 Se 3 films with highly c -axis-oriented and controlled textures were fabricated by maintaining the helium gas pressure ( P ) between 0.7 and 173 Pa and the substrate temperature ( T s ) between 200 and 350 °C. The carrier concentration ( n ) of films decreased with increasing P , which was attributed to the increase of Se concentration from Se deficiency ( P ≤ 6.7 Pa) to stoichiometry to slight Se enrichment ( P ≥ 40 Pa). The Seebeck coefficient ( S ) was enhanced considerably because of the reduction in n , following the S ∼ n − 2/3 relation approximately. The average grain size increased from approximately 100 to 500 nm when T s was raised from 200 to 350 °C, resulting in enhanced carrier mobility ( μ ) and electrical conductivity ( σ ) and a reduced full width at half maximum of (0 0 6) peaks. The shape of grains transformed from rice-like at T s of 200–250 °C to layered-hexagonal platelets (L-HPs) or super-layered flakes (S-LFs) at T s of 300–350 °C. Films that were grown at 300 °C and 40 Pa and contained highly c -axis oriented L-HPs possessed the highest power factor (PF = S 2 σ ), which reached 5.54 μW cm −1 K −2 , where S = 75.8 μV/K and σ = 963.8 S cm −1 . |
| Starting Page | 657 |
| Ending Page | 663 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.apsusc.2013.08.107 |
| Volume Number | 285 |
| Alternate Webpage(s) | https://ir.nctu.edu.tw/bitstream/11536/23261/1/000326579400077.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.apsusc.2013.08.107 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
