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Creation of high-efficiency, toxic- and rare-element-free thin-film solar cells by defect control

Research Project

Project/Area Number 20H02680
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 31020:Earth resource engineering, Energy sciences-related
Research InstitutionNagaoka University of Technology

Principal Investigator

Tanaka Kunihiko  長岡技術科学大学, 工学研究科, 教授 (30334692)

Co-Investigator(Kenkyū-buntansha) 荒木 秀明  長岡工業高等専門学校, 物質工学科, 教授 (40342480)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2020: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Keywords環境調和半導体 / 薄膜太陽電池 / 半導体光物性 / 発光スペクトル / 発光分光 / 欠陥準位 / カルコゲナイド / 有毒元素・レアメタルフリー / 銅カルコゲナイド / Cu2SnS3
Outline of Research at the Start

Cu2Sn1-xGexS3(CTGS)薄膜太陽電池はCu削減, Na添加で効率改善することが知られている.しかし,Cu削減,Na添加で生じた欠陥がどのように高効率化,効率低下に寄与しているのかは不明である.そこで,本研究では,Na添加/無添加のCTGSにおいてCu添加量を変化させたCTGSからの光励起発光スペクトルを分析することで高効率化のために導入すべき欠陥,排除すべき欠陥を明らかにする.この結果を基にCTGS薄膜の欠陥を積極的に制御することで,高効率・有毒希少元素フリー・環境調和薄膜太陽電池を実現する.

Outline of Final Research Achievements

Solar cells which absorption layer is Cu2SnS3 (CTS) and Cu2Sn1-xGexS3 (CTGS) can be highly efficient, non-toxic, rare-element-free, environmentally friendly, and low-cost solar cells. However, the current power conversion efficiency of CTS and CTGS solar cells is much lower than the theoretical efficiency. In order to obtain a guideline for improving the efficiency, the defects that contribute to the efficiency reduction or improvement were investigated by observation of photoluminescence(PL). The defects revealed by PL observation are shallower than room temperature and are not a cause of efficiency reduction, and may contribute to efficiency improvement as a carrier supply source. In addition, the depth of shallow defects hardly changed with Ge content. Those facts indicate that CTS and CTGS are excellent as a solar cell light absorbing layer material.

Academic Significance and Societal Importance of the Research Achievements

Cu2SnS3(CTS)、Cu2Sn1-xGexS3(CTGS)は太陽電池光吸収層材料として注目されているものの、太陽電池素子作製の研究が中心であり発電効率に大きな影響を与える欠陥の研究はあまり進んでいない。特に発光分光観測による欠陥の解析はほとんど行われていない。本研究では発光分光により発電効率に影響を与える欠陥に関する知見を新たに得ることができた。したがってCTS、CTGS薄膜太陽電池の高効率化に対する有益な情報を提供できたといえる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021 2020

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (22 results) (of which Int'l Joint Research: 7 results,  Invited: 3 results)

  • [Journal Article] Dependence of photoluminescence on sulfurization temperature of Cu2SnS3 thin films2023

    • Author(s)
      Kunihiko Tanaka, Shogo Miyagi, Daiki Motai, Ryota Ohashi, Yoko Hosokawa, Kazuo Jimbo, Yoji Akaki and Hideaki Araki
    • Journal Title

      Applied Physics A

      Volume: 129 Issue: 5 Pages: 360-360

    • DOI

      10.1007/s00339-023-06641-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Photoluminescence properties of Cu-poor Cu2Sn1-xGexS3 thin films with varying Ge/(Ge+Sn) ratio2023

    • Author(s)
      Ayaka Kanai、Ryoma Hata、Mutsumi Sugiyama、Kunihiko Tanaka
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: - Issue: 26 Pages: 265102-265102

    • DOI

      10.1088/1361-6463/accc42

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of thiourea concentration during deposition of a CdS buffer layer on the electric properties of Cu<sub>2</sub>SnS<sub>3</sub> solar cells2023

    • Author(s)
      Kanai Ayaka、Saito Soichiro、Araki Hideaki、Tanaka Kunihiko
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: 57 Issue: 2 Pages: 025502-025502

    • DOI

      10.1088/1361-6463/ad00c7

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 発光分光による太陽電池光吸収層材料CuxSn1-yGeyS3の欠陥の検討2021

    • Author(s)
      阿部 司,田中 久仁彦
    • Journal Title

      Journal of Ternary and Multinary Compound

      Volume: 2021 Pages: 10-13

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 発光分光によるCu2Sn1-xGexS3のCu/IV族比依存の検討2021

    • Author(s)
      阿部 司、 田中 久仁彦
    • Journal Title

      令和2年 応用物理学会 多元系化合物・太陽電池研究会 年末講演会論文集

      Volume: - Pages: 40-13

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] NaF蒸着Cu2Sn1-xGexS3 薄膜のフォトルミネッセンス2024

    • Author(s)
      市原 稜大, 田崎 傑士, 荒木 秀明, 金井 綾香, 田中 久仁彦
    • Organizer
      第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 光学特性観測による銅硫化物系太陽電池光吸収層材料の評価2024

    • Author(s)
      田中 久仁彦, 金井 綾香, 荒木秀明, 杉山 睦
    • Organizer
      第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] CdS層成膜時の(NH2)2CS濃度がCu2SnS3薄膜太陽電池の太陽電池特性に与える影響2023

    • Author(s)
      金井 綾香,齋藤 聡一郎, 荒木 秀明, 田中 久仁彦
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Influence of (NH2)2CS concentration during deposition of an n-type CdS buffer layer on the electric properties of Cu2SnS3 thin-film solar cells2023

    • Author(s)
      Kanai Ayaka Saito Souichiro, Hideaki Araki, and Kunihiko Tanaka
    • Organizer
      第33回 日本MRS年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Cu2SnS3太陽電池の発光スペクトルへのCdS バッファ層形成時のチオ尿素濃度の影響2023

    • Author(s)
      市原 稜大, 金井 綾香, 齋藤 聡一郎, 荒木 秀明, 田中 久仁彦,
    • Organizer
      2023年度多元系化合物・太陽電池研究会 年末講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Fabrication of Cu2SnS3 based thin-film solar cells and modules2023

    • Author(s)
      Masaya Takahasi, Takeshi Tasaki, Daiki Motai, Yoji Akaki, Yuji Kurimoto, Tamotsu Okamoto, Aayaka Kanai, Kunihiko Tanaka, Hideaki Araki
    • Organizer
      The 1st KOSEN Research International Symposium (KRIS2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ge/(Ge+Sn)組成比がCu2(Sn,Ge)S3薄膜太陽電池の電気特性に与える影響2023

    • Author(s)
      大橋 零, 金井 綾香, 荒木 秀明, 田中 久仁彦
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Influence of Ge/(Ge+Sn) ratio on morphology and structure properties of Cu2(Sn1-xGex)S3 film2022

    • Author(s)
      Ayaka Kanai, Ryoma Hata, Mutsumi Sugiyama, Kunihiko Tanaka
    • Organizer
      the 33rd International Photovoltaic Science and Engineering Conference (PVSEC-33)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of basic physical properties in Cu2Sn1-xGexS3 by observation of photoluminescence2022

    • Author(s)
      Ryoma Hata, Ayaka Kanai, Mutsumi Sugiyama, Kunihiko Tanaka
    • Organizer
      the 33rd International Photovoltaic Science and Engineering Conference (PVSEC-33)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fabrication of monolithic integrated CTS thin film solar cells2022

    • Author(s)
      Masaya Takahashi, Takeshi Tasaki, Daiki Motai, Yoji Akaki, Yuji Kurimoto, Tamotsu Okamoto, Ayaka Kanai, Kunihiko Tanaka, Hideaki Araki
    • Organizer
      7th STI‐Gigaku2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of Ge inclusion on surface morphologies of Cu2(Sn1-xGex)S3 films grown by sulfurization of Cu/Sn-S precursors2022

    • Author(s)
      Mutsumi Sugiyama, Ayaka Kanai, Kunihiko Tanaka
    • Organizer
      2022 MRS Fall Meeting & Exhibit
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] n-CdS層成膜時の(NH2)2CS濃度がCu2SnS3(CTS)太陽電池の電気特性に与える影響2022

    • Author(s)
      金井 綾香,齋藤 聡一郎, 荒木 秀明, 田中 久仁彦
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] フォトルミネッセンス観測によるCu 2Sn1-xGexS3の基礎物性の調査2022

    • Author(s)
      羽田 涼馬,金井 綾香,杉山 睦,田中 久仁彦
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] モノリシック集積型CTS薄膜太陽電池モジュールの作製2022

    • Author(s)
      高橋 昌也, 茂田井 大輝, 田崎 傑士, 赤木 洋二,栗本 祐司,岡本 保,金井 綾香,田中 久仁彦,荒木 秀明,
    • Organizer
      第9回高専-TUT太陽電池合同シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 環境調和型化合物薄膜太陽電池の現状2022

    • Author(s)
      金井 綾香, 杉山睦, 荒木秀明, 田中久仁彦
    • Organizer
      日本太陽光発電学会Women in Photovoltaics分科会研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Cu2SnS3系太陽電池の特徴と高効率化技術2022

    • Author(s)
      金井 綾香, 杉山 睦, 荒木 秀明, 田中 久仁彦
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Investigation of Cu/IV ratio dependence of CuxSn1-yGeyS3 by photoluminescence observation2021

    • Author(s)
      Tsukasa Abe, Kunihiko Tanaka
    • Organizer
      2021 International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Photoluminescence from Cu2SnS3 thin films depend on sulfurization temperature2021

    • Author(s)
      Shogo Miyagi, Kunihiko Tanaka
    • Organizer
      2021 International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 発光分光による太陽電池光吸収層材料CuxSn1-yGeyS3の欠陥の検討2021

    • Author(s)
      阿部 司,田中 久仁彦
    • Organizer
      多元系化合物・太陽電池研究会 年末講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 発光分光による異なる硫化温度で作製したCu2SnS3薄膜の評価2021

    • Author(s)
      宮城 祥吾, 田中 久仁彦, 茂田井 大輝, 大橋 亮太,渡邉 奏汰, 細川 陽子, 神保 和夫, 赤木 洋二, 荒木 秀明
    • Organizer
      多元系化合物・太陽電池研究会 年末講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] フォトルミネッセンス観測によるCuxSn1-yGeyS3のCu/IV族比依存の検討2021

    • Author(s)
      阿部 司、 田中 久仁彦
    • Organizer
      応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 発光分光によるCu2Sn1-xGexS3のCu/IV族比依存の検討2020

    • Author(s)
      阿部 司、 田中 久仁彦
    • Organizer
      応用物理学会 多元系化合物・太陽電池研究会 年末講演会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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