DataVXAdvanced Optical MaterialsPaper
journal article·2020-11

Role of Spontaneous Orientational Polarization in Organic Donor–Acceptor Blends for Exciton Binding

Yuuhi Ueda, Hajime Nakanotani, Takuya Hosokai, Yuya Tanaka, Hokuto Hamada, Hisao Ishii, Shuhei Santo, Chihaya Adachi

Advanced Optical Materials· Volume 8· Issue 21
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Source abstract

Abstract

Abstract Electron–hole pairs at the interface between electron‐donating and electron‐accepting molecules form charge‐transfer excitons (CTEs) via Coulomb attraction. Generally, the attraction energy of the CTE is weaker than that of the Frenkel exciton because of spatial separation of the charge pair; thus, the binding of the CTE is expected to be sensitive to an electric field. Here, the shielding of the binding energy of the CTEs by an internal electric field induced by spontaneous orientation polarization (SOP) of the solid‐state donor–acceptor blend film is reported. When the blend film forms a large SOP, the photogenerated CTEs spontaneously dissociate without an external electric field, resulting in carrier diffusion and carrier lifetimes that are in the milliseconds or longer. In the absence of a large SOP, the CTEs preferentially form exciplexes that quickly release their energy as light rather than dissociation. Hence, the control of SOP in the donor–acceptor blend films can provide new insights into exciton binding and facilitate the development of tailored high‐performance organic semiconductor devices.
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Research context

Electronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Organic Photonics and Electronics Research (OPERA) and Department of Applied Chemistry Kyushu University 744 Motooka Nishi Fukuoka 819‐0395 Japan

JST ERATO Adachi Molecular Exciton Engineering Project c/o Center for Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka, Nishi Fukuoka 819‐0395 Japan

International Institute for Carbon Neutral Energy Research (WPI‐I2CNER) Kyushu University 744 Motooka, Nishi Fukuoka 819‐0395 Japan

National Metrology Institute of Japan (NMIJ) National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐8565 Japan

Center for Frontier Science Chiba University Chiba 263‐8522 Japan

Graduate School of Science and Engineering Chiba University Chiba 263‐8522 Japan

Funding

Japan Science and Technology Agency · Exploratory Research for Advanced Technology · Japan Society for the Promotion of Science

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