Investigation of photo-induced carrier dynamics in solar cells consisting of multinary compound semiconductors using photo-assisted nanoprobes

2021 Fiscal Year Final Research Report

• Project/Area Number: 17H02783
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: The University of Tokyo
• Principal Investigator: Takahashi Takuji 東京大学, 生産技術研究所, 教授 (20222086)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: ナノプローブ / 多元系化合物半導体 / 太陽電池 / 光励起キャリア / 光起電力 / 再結合プロセス

Outline of Final Research Achievements

Photo-assisted nanoprobe methods such as photo-assisted Kelvin probe force microscopy (P-KFM) and photothermal mode atomic force microscopy (PT-AFM) have been developed and improved. By means of them, in addition, photo-induced carrier dynamics, especially their recombination property, in solar cells consisting of multinary compound semiconductor like Cu(In,Ga)(S,Se)2 have been investigated. Furthermore, the electrostatic force microscopy with multi-frequency bias modulation method which becomes a base of optical capacitance AFM (PCap-AFM) has been developed, and its validity has been confirmed through actual measurements on similar solar cells.

Free Research Field

ナノエレクトロニクスおよびナノ計測

Academic Significance and Societal Importance of the Research Achievements

多くの場合に微結晶系となる太陽電池用多元系化合物半導体に対して、局所計測が可能な光援用ナノプローブ技術を適用することによって、結晶粒界が光励起キャリアの再結合プロセスに与える影響などの微視的な知見を得るといった学術的な成果を上げた。また、それらの知見は、同種太陽電池の将来的な特性改善への貢献が期待されるといった社会的な意義も持っている。