Improvement of properties of solar cells by quantum dots with the function of UV - visible wavelength conversion

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H02061
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: Keio University
• Principal Investigator: ISOBE Tetsuhiko 慶應義塾大学, 理工学部(矢上), 教授 (30212971)
• Co-Investigator(Kenkyū-buntansha): 磯 由樹 慶應義塾大学, 理工学部(矢上), 助教 (00769705)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 蛍光体 / 量子ドット / 波長変換 / 太陽電池

Outline of Final Research Achievements

An ultraviolet light absorber is used in a photovoltaic module to protect its parts from ultraviolet light. As a result, in photovoltaic modules, the spectral sensitivity of wavelengths below 400 nm is reduced. If a phosphor converting ultraviolet light into visible light is used instead of the ultraviolet light absorber, it is possible to protect the photovoltaic module from ultraviolet light and at the same time to improve the spectral sensitivity of the photovoltaic module in ultraviolet range. In this research, we have developed core / shell type CuInS2/ZnS and CuGaS2/ZnS quantum dot phosphors that convert ultraviolet light to visible light and have high transparency to visible light with high spectral sensitivity of photovoltaic modules. We investigated the improvement of photoelectric conversion efficiency of the photovoltaic module by wavelength conversion of these quantum dots.

Free Research Field

ナノ蛍光体材料

Academic Significance and Societal Importance of the Research Achievements

本研究は、量子ドットのバンドギャップを調節できる特性を活かして、紫外光を可視光へ変換する波長変換材料を太陽電池へ応用するユニークな取り組みであり、学術的な意義がある。また、本研究のような太陽電池の効率を向上させる取り組みは、クリーンエネルギーを有効活用する面から社会的意義は大きい。