Synthesis of neutral Li-endohedral PCBM: an n-dopant for fullerene derivatives

Hiroshi Ueno; Daiki Kitabatake; Hao-Sheng Lin; Yue Ma; Il Jeon; Seiichiro Izawa; Masahiro Hiramoto; Fuminori Misaizu; Shigeo Maruyama; Yutaka Matsuo

doi:10.1039/D2CC03678A

Synthesis of neutral Li-endohedral PCBM: an n-dopant for fullerene derivatives†

Hiroshi Ueno,

*^ab Daiki Kitabatake,^a Hao-Sheng Lin,^c Yue Ma,‡^d Il Jeon,

^e Seiichiro Izawa,

^fg Masahiro Hiramoto,^fg Fuminori Misaizu,

^b Shigeo Maruyama

^h and Yutaka Matsuo

*^bch

Author affiliations

* Corresponding authors

^a Creative Interdisciplinary Research Division, The Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Japan
E-mail: hiroshi.ueno.d5@tohoku.ac.jp

^b Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Japan
E-mail: yutaka.matsuo@chem.material.nagoya-u.ac.jp

^c Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan

^d Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei, Anhui, China

^e Department of Nano Engineering, SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University (SKKU), Seobu-ro 2066, Jangan-gu, Suwon-si, Gyeonggi-do, Republic of Korea

^f Institute for Molecular Science, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, Japan

^g The Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, Japan

^h Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan

Abstract

Li@PCBM, the first neutral Li@C₆₀ derivative, was synthesized. The Li@PCBM exists in a monomer-dimer equilibrium in solution but as a monomer in the PCBM matrix. The fully dispersed Li@PCBM n-doped the surrounding empty PCBM, raising the Fermi level by 0.13 eV compared with the undoped PCBM film. The hybrid films were utilized as an ETL for PSCs, promoting the efficiency of the device.

Chemical Communications

Synthesis of neutral Li-endohedral PCBM: an n-dopant for fullerene derivatives†

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