Optical study of two-dimensional organic-inorganic perovskite materials for solar cell applications

2016 Fiscal Year Final Research Report

• Project/Area Number: 26600119
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Optical engineering, Photon science
• Research Institution: Sophia University
• Principal Investigator: EMA Kazuhiro 上智大学, 理工学部, 教授 (40194021)
• Co-Investigator(Renkei-kenkyūsha): KUNUGITA Hideyuki 上智大学, 理工学部, 准教授 (50296886) ; TAKEOKA Yuko 上智大学, 理工学部, 准教授 (50338430)
• Research Collaborator: UDAGAWA Yosuke ; KIYOTA Yuki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 無機有機ハイブリッド物質 / 励起子 / 太陽電池 / 量子井戸

Outline of Final Research Achievements

We studied optical properties in two-dimensional structure (quantum well) of inorganic-organic hybrid perovskite material which attracts much attention in recent years for application to solar cell. Specifically, we studied excitonic properties and solar-power generation for two-dimensional structure, and excitonic properties for three-dimensional structure.
Although several reports showed that excitons are absent in the three-dimensional materials, we have evaluated the exciton binding energy by precise optical measurements to be 20 ~ 40 meV for CH3NH3PbBr3 and 10 ~ 20 meV for CH3NH3PbI3. This result indicates that the excitons are stable even at room temperature in CH3NH3PbBr3, and excitons are dissociated in CH3NH3PbI3.
Furthermore, we have succeeded in fabrication of the solar cell structure using the two-dimensional structure. We have confirmed that the solar cell shows power generation, although the power conversation efficiency was low at present.

Free Research Field

光物性