Development of electroabsorption spectroscopy with pumping and probing lights and the study of the internal electric field of organic thin-film solar cells under illumination

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05251
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 29010:Applied physical properties-related
• Research Institution: Shimane University
• Principal Investigator: Hiromitsu Ichiro 島根大学, 学術研究院理工学系, 教授 (40199138)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 有機薄膜太陽電池 / 動作原理 / 内部電場 / 電場変調分光法

Outline of Final Research Achievements

A new electroabsorption spectroscopy with pumping and probing lights (EAPP　method) has been developed, and the internal electric field of organic thin-film solar cells(OTFSC) was measured. OTFSC has a junction of two organic-semiconcuctor layers. By the EAPP method, the internal electric fields of the two semiconductor layers under a pumping excitation of either of the layers, which gives us an information on the carrier generation mechanism in the solar cells. It is a general understanding that the carrier generation in OTFSC occurs at the interface of the two organic layers. By the present study, however, it has been shown that the carrier generation occurs not only at the interface.

Free Research Field

有機半導体デバイス

Academic Significance and Societal Importance of the Research Achievements

有機薄膜太陽電池は次世代の太陽電池として研究されているが、その動作機構には不明な点があり、それを解明することで、更なる特性向上につなげることができる。動作機構の研究において、太陽電池中の内部電場の振る舞いを知ることは極めて重要である。本研究では、有機薄膜太陽電池の内部電場を研究するための新しい方法を開発し、動作機構に関する新たな知見を得た。