Creation of High-Performance Sulfide-Based Nanocomposite Thermoelectric Materials by Controlling Sea-Island Structure Using Colloidal Method

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H02440
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26030:Composite materials and interfaces-related
• Research Institution: Japan Advanced Institute of Science and Technology
• Principal Investigator: Maenosono Shinya 北陸先端科学技術大学院大学, 先端科学技術研究科, 教授 (00323535)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: ナノ粒子 / 熱電材料 / ナノ構造化 / ナノコンポジット / フォノン散乱 / 格子熱伝導率 / キャリア密度

Outline of Final Research Achievements

In the p-type, Cu3ZnSnS5-y, Cu3Al1-xGaxSnS5, Ag-doped SnS and SnSe nanoparticles were synthesised. Various nanocomposite thermoelectric materials were also created by blending Cu3AlSnS5 nanoparticles with Cu2SnS3 nanoparticles as nanoinclusions or blending Cu3ZnSnS5-y nanoparticles with other p-type thermoelectric nanoparticles such as Cu2SnS3 as nanoinclusions. In the case of n-type, nanoparticles of CuFe2S3, CoSbS, Ag-doped CuFeS2, Cu1-xZnxFeS2, CuFe2S1.5Se0.5 and SnSe2 were synthesised and various nanocomposite thermoelectric materials comprising these combinations were created.

Free Research Field

ナノ材料化学

Academic Significance and Societal Importance of the Research Achievements

地球上で産生されたエネルギーのうち約7割のエネルギーが200℃以下の低温廃熱として捨てられている現状がある。本研究の成果を基にして、環境調和型硫化物系熱電材料の熱電変換効率を実用化レベルにまで向上できれば、環境調和型硫化物系熱電材料を用いた熱電素子を開発することにより、これらの低温廃熱のエネルギーハーベスティングが実現でき、地球温暖化抑制や省エネ対策に大きく貢献する。