Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals

Pritam Sadhukhan, Shu-Qi Wu, Shinji Kanegawa (), Sheng-Qun Su, Xiaopeng Zhang, Takumi Nakanishi, Jeremy Ian Long, Kaige Gao, Rintaro Shimada, Hajime Okajima, Akira Sakamoto, Joy G. Chiappella, Myron S. Huzan, Thomas Kroll, Dimosthenis Sokaras, Michael L. Baker and Osamu Sato ()
Additional contact information
Pritam Sadhukhan: Kyushu University
Shu-Qi Wu: Kyushu University
Shinji Kanegawa: Kyushu University
Sheng-Qun Su: Kyushu University
Xiaopeng Zhang: Kyushu University
Takumi Nakanishi: Kyushu University
Jeremy Ian Long: Kyushu University
Kaige Gao: Yangzhou University
Rintaro Shimada: Aoyama Gakuin University
Hajime Okajima: Aoyama Gakuin University
Akira Sakamoto: Aoyama Gakuin University
Joy G. Chiappella: The University of Manchester
Myron S. Huzan: The University of Manchester
Thomas Kroll: Stanford University
Dimosthenis Sokaras: Stanford University
Michael L. Baker: The University of Manchester
Osamu Sato: Kyushu University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract To alleviate the energy and environmental crisis, in the last decades, energy harvesting by utilizing optical control has emerged as a promising solution. Here we report a polar crystal that exhibits photoenergy conversion and energy storage upon light irradiation. The polar crystal consists of dinuclear [CoGa] molecules, which are oriented in a uniform direction inside the crystal lattice. Irradiation with green light induces a directional intramolecular electron transfer from the ligand to a low-spin CoIII centre, and the resultant light-induced high-spin CoII excited state is trapped at low temperature, realizing energy storage. Additionally, electric current release is observed during relaxation from the trapped light-induced metastable state to the ground state, because the intramolecular electron transfer in the relaxation process is accompanied with macroscopic polarization switching at the single-crystal level. It demonstrates that energy storage and conversion to electrical energy is realized in the [CoGa] crystals, which is different from typical polar pyroelectric compounds that exhibit the conversion of thermal energy into electricity.

Date: 2023
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DOI: 10.1038/s41467-023-39127-8

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