Boosting charge separation in organic photovoltaics: unveiling dipole moment variations in excited non-fullerene acceptor layers

Author:

Yamakata Akira1ORCID,Kato Kosaku1,Urakami Takumi2,Tsujimura Sota3,Murayama Kasumi3,Higashi Masahiro4ORCID,Sato Hirofumi2ORCID,Kobori Yasuhiro356ORCID,Umeyama Tomokazu7ORCID,Imahori Hiroshi289ORCID

Affiliation:

1. Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushima-naka, Kita-ku, Okayama 700-8530, Japan

2. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan

3. Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan

4. Department of Complex Systems Science, Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

5. Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan

6. CREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan

7. Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201, Japan

8. Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan

9. Institute for Liberal Arts and Sciences (ILAS), Kyoto University, Kyoto 606-8316, Japan

Abstract

Neat ITIC films are found to facilitate charge transfer, dissociation, and free carrier formation without the need for donor layers. This process, driven by V-type molecular stacking, significantly boosts organic photovoltaic efficiency.

Funder

Ministry of Education, Culture, Sports, Science and Technology

Izumi Science and Technology Foundation

Nippon Sheet Glass Foundation for Materials Science and Engineering

Japan Science and Technology Agency

Publisher

Royal Society of Chemistry (RSC)

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