Development of film processing strategy and optoelectronic performance of Sb,Bi-based photoelectric matrial using in-situ dynamic characterization

2024 Fiscal Year Final Research Report

• Project/Area Number: 23K13826
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Osaka University
• Principal Investigator: Nishikubo Ryosuke 大阪大学, 大学院工学研究科, 助教 (10909188)
• Project Period (FY): 2023-04-01 – 2025-03-31
• Keywords: 太陽電池 / 光センサー / 波長識別 / 非鉛材料

Outline of Final Research Achievements

Focusing on Bi- and Sb-based chalcohalide materials as stable and low-toxicity alternatives to lead-based photovoltaic materials, we have pursued material discovery, process development, and the exploration of novel functionalities. These efforts have resulted in the publication of 15 research papers, numerous presentations at domestic and international conferences, and the receipt of two prestigious awards. In particular, significant progress has been made in the study of SbSI materials, with a focus on the wavelength-dependent photoresponse effect (WDPE), a phenomenon first discovered by the principal investigator. Advances have also been achieved in the development of high-quality SbSI thin-film fabrication techniques utilizing gas-solid reaction processes. In addition to the results already published, two manuscripts have been completed and are currently in preparation for submission, with further research outcomes anticipated.

Free Research Field

無機材料化学、物性化学、エネルギー関連化学、半導体、デバイス

Academic Significance and Societal Importance of the Research Achievements

Bi,Sb系材料は鉛ペロブスカイトに比べ低毒かつ耐水性が高いという強力な利点がある。しかし太陽電池性能は低く、その大きな要因として鉛ペロブスカイトのような大粒径・高純度・高被覆性の薄膜作製が難しかったことが挙げられる。本研究では気固相反応を用いることで高結晶性かつ高い被覆性を実現する成膜プロセスを開発し、カルコハライドや硫化物材料の今後の発展の足場となる知見が得られた。これは学術的にも社会的にも意義がある。また、独自発見の波長識別機能の機構解明、波長センシング性能の向上、メモリ機能発現に成功した。これを応用すればイメージセンサの超小型化や光電融合への適用などが期待され、社会的意義は大きい。