Addition effects of halogen compounds on electron transport properties of lead-free perovskite solar cells

• Project/Area Number: 18K14316
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Kagawa National College of Technology (2019-2020); Shinshu University (2018)
• Principal Investigator: SHIRAHATA Yasuhiro 香川高等専門学校, 一般教育科(詫間キャンパス), 助教 (10791543)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 非鉛ペロブスカイト太陽電池 / 熱処理温度 / I/Bi比 / ハロゲン化合物 / 添加効果 / (CH3NH3)3Bi2I9 / 表面形態改良 / 変換効率 / NH4I添加 / 封止型ペロブスカイト太陽電池 / ペロブスカイト太陽電池 / 非鉛材料 / 電子輸送特性

Outline of Final Research Achievements

In this research, the effects of annealing temperature on photovoltaic properties of (CH3NH3)3Bi2I9 solar cells, one of the lead-free perovskite solar cells, were investigated. As a result, the (CH3NH3)3Bi2I9 photovoltaic cell annealed at 130 ℃ showed the highest conversion efficiency in the present research. Moreover, the iodide(I)/bismuth(Bi) ratio of the (CH3NH3)3Bi2I9 photoactive layers was investigated, and the highest I/Bi ratio was obtained at the annealing temperature of 130 ℃. These results indicate that it is necessary to obtain (CH3NH3)3Bi2I9 with a high I/Bi ratio to improve the conversion efficiency of (CH3NH3)3Bi2I9 solar cells.

Academic Significance and Societal Importance of the Research Achievements

CH3NH3PbI3をはじめとする鉛(Pb)ペロブスカイト太陽電池にはPbが使用されていることから，Pbを含まない，非鉛ペロブスカイト太陽電池に期待が集まっている。しかし，非鉛ペロブスカイト太陽電池の変換効率は低いことが知られていることから，非鉛ペロブスカイト太陽電池の変換効率向上が喫緊の課題となっている。そこで，本研究にて非鉛ペロブスカイト太陽電池の１つである(CH3NH3)3Bi2I9太陽電池の光電変換特性における熱処理温度の影響について調査し，高効率化に必要な知見を獲得することができれば，(CH3NH3)3Bi2I9太陽電池の高効率化が期待できる。

Research Products

• [Journal Article] Effects of annealing temperature on photovoltaic properties of lead-free (CH₃NH₃)₃Bi₂I₉ solar cells (2020)
  • Author(s): SHIRAHATA Yasuhiro
  • Journal Title: Journal of the Ceramic Society of Japan Volume: 128 Issue: 5 Pages: 298-303
  • DOI: 10.2109/jcersj2.19156
  • NAID: 130007839537
  • ISSN: 1348-6535, 1882-0743
  • Year and Date: 2020-05-01
  • Peer Reviewed
• [Journal Article] Structural and photovoltaic properties of perovskite solar cells with addition of ammonium iodide (2019)
  • Author(s): Yasuhiro Shirahata
  • Journal Title: AIP Conference Proceedings Volume: 2067 Pages: 020017-020017
  • DOI: 10.1063/1.5089450
  • Peer Reviewed / Open Access
• [Presentation] Fabrication and Characterization of Non-Lead Perovskite Solar Cells (2019)
  • Author(s): SHIRAHATA Yasuhiro
  • Organizer: The 3rd NIT-NUU Bilateral Academic Conference 2019
  • Int'l Joint Research
• [Presentation] Structural and Photovoltaic Properties of (CH3NH3)3Bi2I9 Solar Cells (2019)
  • Author(s): SHIRAHATA Yasuhiro
  • Organizer: Irago Conference 2019
  • Int'l Joint Research
• [Presentation] Influence of Electron Transport Layer Thickness on Photovoltaic Performance of Encapsulated Perovskite Solar Cells (2019)
  • Author(s): SHIRAHATA Yasuhiro
  • Organizer: Irago Conference 2019
  • Int'l Joint Research
• [Presentation] (CH3NH3)3Bi2I9太陽電池におけるアニール温度の影響 (2019)
  • Author(s): 白幡泰浩
  • Organizer: 第29回日本MRS年次大会
• [Presentation] Characterization of CH3NH3PbI3-xClx Films Added with Ammonium Halides for Photoelectric Device Application (2019)
  • Author(s): Yasuhiro Shirahata
  • Organizer: The 22nd SANKEN International Symposium and The 17th SANKEN Nanotechnology International Symposium
  • Int'l Joint Research
• [Presentation] Structural and Photovoltaic Properties of Perovskite Solar Cells with Addition of Ammonium Iodide (2018)
  • Author(s): Yasuhiro Shirahata
  • Organizer: Irago Conference 2018
  • Int'l Joint Research
• [Presentation] ペロブスカイト太陽電池におけるヨウ化アンモニウムの添加効果 (2018)
  • Author(s): 白幡泰浩
  • Organizer: 平成30年度(2018年) 応用物理学会 北陸・信越支部 学術講演会