Innovative performance improvement of electron source by heterojunction

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K17994
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: Nagoya University
• Principal Investigator: guo lei 名古屋大学, シンクロトロン光研究センター, 助教 (10816127)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: アルカリカソード薄膜 / ヘテロ接合 / 真空輸送装置 / 光電子分光

Outline of Final Research Achievements

In pursuit of realizing a novel NEA-GaAs structure utilizing heterojunctions with alkaline cathode thin films to attain negative electron affinity, we endeavored to comprehend the thin film NEA layer and challenged the elucidation of its chemical bonding states.
We developed a vacuum suitcase capable of transporting cathodes without compromising the functionality of fragile NEA layers. Utilizing this innovation, we achieved the successful transportation of cathodes from university laboratories to synchrotron facilities without damage for the first time worldwide.
Two deposition methods were explored, confirming differences in the composition of fabricated cathode structures. Striving for robust NEA layers, it was deduced that the composition obtained from K evaporation deposition method was optimal.

Free Research Field

加速器

Academic Significance and Societal Importance of the Research Achievements

今までカソードの性能とする量子効率と寿命だけに注目してカソードの研究開発を行っている。一方、その性能が更なる向上することが難しくなってきた。その問題に対して、本研究の成果では、カソードの研究開発に新しい手口を提供することができた。フォトカソード自体の化学結合状態及びその物理的なメカニズムの解明からフォトカソードの分子構造などの理解を深めることが可能になり、カソード性能の向上に繋ぐ。