High-Performance Black Copolymers Enabling Full Spectrum Control in Electrochromic Devices

Dinghui Chen, Zizheng Tong, Qiushi Rao, Xingchen Liu, Hong Meng () and Wei Huang
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Dinghui Chen: Northwestern Polytechnical University (NPU)
Zizheng Tong: Peking University
Qiushi Rao: Peking University
Xingchen Liu: Peking University
Hong Meng: Peking University
Wei Huang: Northwestern Polytechnical University (NPU)

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Black-to-transparent electrochromism is hailed as the holy grail of organic optoelectronics. Despite its potential, designing black electrochromic materials that fully absorb visible light remains a significant challenge. Electroactive materials that simultaneously possess excellent cyclic stability, fast switching times, and high coloration efficiency are rare. In this study, we successfully designed copolymers that fully absorb the entire visible spectrum by judiciously selecting four types of monomers. We incorporated two types of polar side chains to synergistically enhance the ionic conductivity of the copolymers, thus improving the performance of electrochromic devices. Among these electrochromic devices, the P2-a device exhibits cycling stability exceeding 105 cycles, and the P2-c device demonstrates a coloring/ bleaching time of 0.82 s/0.86 s and achieves a coloration efficiency of 1078 cm²/C. This study proposes a strategy for designing and synthesizing high-performance black electrochromic copolymers.

Date: 2024
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DOI: 10.1038/s41467-024-52430-2

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