Absolute photoluminescence spectroscopy for diagnosis and optimization of next-generation quantum nano solar cells

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05254
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28020:Nanostructural physics-related
• Research Institution: Kanagawa Institute of Industrial Sclence and Technology (2021-2022); The University of Tokyo (2020)
• Principal Investigator: Tamaki Ryo 地方独立行政法人神奈川県立産業技術総合研究所, 戦略的研究シーズ育成プロジェクト, 研究員(任期有) (10767742)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 中間バンド型太陽電池 / 量子ドット太陽電池 / 絶対値発光分光 / 光閉じ込め構造

Outline of Final Research Achievements

In quantum nanostructured solar cells, bias voltage, temperature, and light concentration dependences of absolute photoluminescence (PL) spectra were analyzed quantitatively. In addition to the increase in quasi-Fermi level splitting due to the light concentration, we found that voltage enhancement could be obtained by utilizing the hot carrier effect. As for the light confinement structure, Fabry-Perot cavity could be realized more than 10-fold enhancement of the optical field by controlling the position of the quantum nanostructure in the stacking direction.

Free Research Field

光物性

Academic Significance and Societal Importance of the Research Achievements

次世代高効率太陽電池の候補である量子ドット中間バンド型太陽電池において、絶対値発光分光による擬フェルミレベル分裂（内部電圧に相当）の定量解析と、光閉じ込め構造の設計及びデバイス実装に取り組んだ。高効率化実現に向けた電圧維持の要件達成と中間バンド型動作の原理実証に向けたデバイス設計指針を見出し、革新的原理に基づく次世代高効率太陽電池の特性向上に資する知見を得た。