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Synthesis of chalcogenide compounds for energy harvesting applications
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 정인 | - |
dc.contributor.author | Hocheol Shin | - |
dc.date.accessioned | 2017-07-19T05:58:45Z | - |
dc.date.available | 2017-07-19T05:58:45Z | - |
dc.date.issued | 2017-02 | - |
dc.identifier.other | 000000140855 | - |
dc.identifier.uri | https://hdl.handle.net/10371/129436 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2017. 2. 정인. | - |
dc.description.abstract | The effect of ZnTe incorporation on PbTe to increase thermoelectric performance by valence band convergence was examined. Also structural and spectroscopic characterizations were noted from the theoretical calculations, and thermoelectric transport properties of Pb0.985Na0.015Te-x% ZnTe (x = 0, 1, 2, 4). The fact that solid solubility limit of ZnTe in PbTe is less than 1 mol% is studied. A tendency of Hall coefficients with ZnTe contents implies that valence band is a little converged. Therefore, there was no significant enhancement in the Seebeck coefficient. But, the lattice thermal conductivity was reduced from introduction of ZnTe in p-type Pb0.985Na0.015Te. In conclusion, the spark plasma sintered Pb0.985Na0.015Te-2% ZnTe reaches the best ZT of 1.73 at 700K, which arises from a relatively high power factor of ~27.0 μW cm-1 K-2 and a low lattice thermal conductivity of ~0.69 W m-1 K-1 at ~700 K. | - |
dc.description.tableofcontents | Part 1 INTRODUCTION 1
Part 2 EXPERIMENTAL SECTION 5 2.1 Synthesis of bulk ingot and powder processing 5 2.2 Spark plasma sintering 5 2.3 Powder X-ray diffraction (XRD) and infrared spectroscopy 6 2.4 Fisrt-principles electronic structure calculations 7 2.5 Electrical transport properties 8 2.6 Thermal conductivity 9 2.7 Hall measurement 10 Part 3. RESULTS AND DISCUSSION 11 3.1 Powder X-ray diffraction (XRD) and infrared spectroscopy analysis 11 3.2 Electronic band structures of Pb0.985Na0.015Te-x% ZnTe (x = 0, 1, 2, 4) 15 3.3 Electrical properties of Pb0.985Na0.015Te-x% ZnTe (x = 0, 1, 2, 4) 19 3.4 Thermal transport property of Pb0.985Na0.015Te-x% ZnTe (x = 0, 1, 2, 4) 32 3.5 Thermoelectric figure of merit ZT of Pb0.985Na0.015Te-x% ZnTe (x = 0, 1, 2, 4) 37 Part 4. CONCLUSIONS 39 REFERENCES 41 APPENDIX 46 | - |
dc.format | application/pdf | - |
dc.format.extent | 1660347 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | Thermoelectric | - |
dc.subject | PbTe | - |
dc.subject | ZnTe | - |
dc.subject | Hole doping | - |
dc.subject.ddc | 660 | - |
dc.title | Synthesis of chalcogenide compounds for energy harvesting applications | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.citation.pages | 56 | - |
dc.contributor.affiliation | 공과대학 화학생물공학부 | - |
dc.date.awarded | 2017-02 | - |
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