Control of non-equilibrium defects and n-type thin film of environmentally friendly next-generation solar cell material SnS
| Project/Area Number |
19H02430
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26020:Inorganic materials and properties-related
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| Research Institution | University of Yamanashi |
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Principal Investigator |
Yanagi Hiroshi 山梨大学, 大学院総合研究部, 教授 (30361794)
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| Co-Investigator(Kenkyū-buntansha) |
鈴木 一誓 東北大学, 多元物質科学研究所, 助教 (60821717)
川西 咲子 東北大学, 多元物質科学研究所, 助教 (80726985)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
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| Keywords | SnS / 太陽電池 / 昇華法 / n型SnS / 薄膜 / 薄膜太陽電池 / フラッシュ蒸着法 |
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| Outline of Research at the Start |
本研究では、SnS薄膜中で生じるキャリア電子を捕獲する欠陥の生成・消滅メカニズムを明らかにすることでSnS薄膜のn型化とpnホモ接合薄膜の形成を目指した研究を加速する。さらにSnS薄膜表面・界面の電子状態を明らかにすることで、pnホモ接合界面・電極/SnS界面の電子状態と欠陥を解明し、高性能pnホモ接合の作製指針を提言する。
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| Outline of Final Research Achievements |
To increase the Cl concentration in the films, we fabricated thin films using Cl-doped powders and single crystals as source materials and achieved a maximum Cl concentration of 1.8 at.%. By optimizing the film preparation method and conditions to reduce the in-gap states, a highly oriented film with an absorption coefficient of <2x10E4 cm-1 in the bandgap region was successfully fabricated. The carrier concentration was estimated to be <10E16 cm-3. It was also found that the p/n conduction type can be controlled by a slight change in the Sn/S ratio by optimizing the growth conditions of undoped single crystals. Furthermore, p-type SnS was deposited on n-type single crystals by the sublimation method to fabricate pn homojunctions, and clear rectifying properties were observed.
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| Academic Significance and Societal Importance of the Research Achievements |
簡便な昇華法などの製膜手法で欠陥濃度の低い薄膜を実現したことやundoped単結晶での不純物添加に頼らず伝導型の制御を実現したことはSnS太陽電池の高効率化に寄与していくものと考えられる。SnSは環境親和性が高く資源制約も少ない材料であるた。今回の研究成果は近い将来低コスト高効率太陽電池を実現しうる薄膜材料として期待させるものである。
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Report
(4 results)
Research Products
(17 results)
