Exciton-Scissoring Perfluoroarenes Trigger Photomultiplication in Full Color Organic Image Sensors

Juhee Kim; Hyukmin Kweon; Myeongjae Lee; Mingyun Kang; Sangjun Lee; Sanghyeok An; Wonjong Lee; Seokran Choi; Hanbin Choi; Yujin Seong; Hyobin Ham; Hyojung Cha; Jongchul Lim; Do Hwan Kim; BongSoo Kim; Dae Sung Chung

doi:10.1002/adma.202302786

Exciton-Scissoring Perfluoroarenes Trigger Photomultiplication in Full Color Organic Image Sensors

Adv Mater. 2023 Nov;35(45):e2302786. doi: 10.1002/adma.202302786. Epub 2023 Sep 13.

Authors

Juhee Kim¹, Hyukmin Kweon², Myeongjae Lee³, Mingyun Kang¹, Sangjun Lee¹, Sanghyeok An¹, Wonjong Lee⁴, Seokran Choi², Hanbin Choi², Yujin Seong⁵, Hyobin Ham⁶, Hyojung Cha⁷, Jongchul Lim⁴, Do Hwan Kim^{2

8

9}, BongSoo Kim^{5

6

10}, Dae Sung Chung¹

Affiliations

¹ Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
² Department of Chemical Engineering, Hanyang University, Seoul, 04763, Republic of Korea.
³ Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea.
⁴ Graduate School of Energy Science & Technology, Chungnam National University, Daejeon, 34134, Republic of Korea.
⁵ Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.
⁶ Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.
⁷ Department of Hydrogen and Renewable Energy, Kyungpook National University, Daegu, 41566, Republic of Korea.
⁸ Institute of Nano Science and Technology, Hanyang University, Seoul, 04763, Republic of Korea.
⁹ Clean-Energy Research Institute, Hanyang University, Seoul, 04763, Republic of Korea.
¹⁰ Graduate School of Semiconductor Materials and Device Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.

PMID: 37421369
DOI: 10.1002/adma.202302786

Abstract

An unprecedented but useful functionality of perfluoroarenes to enable exciton scissoring in photomultiplication-type organic photodiodes (PM-OPDs) is reported. Perfluoroarenes that are covalently connected to polymer donors via a photochemical reaction enable the demonstration of high external quantum efficiency and B-/G-/R-selective PM-OPDs without the use of conventional acceptor molecules. The operation mechanism of the suggested perfluoroarene-driven PM-OPDs, how covalently bonded polymer donor:perfluoroarene PM-OPDs can perform as effectively as polymer donor:fullerene blend-based PM-OPDs, is investigated. By employing a series of arenes and conducting steady-state/time-resolved photoluminescence and transient absorption spectroscopy analyses, it is found that interfacial band bending between the perfluoroaryl group and polymer donor is responsible for exciton scissoring and subsequent electron trapping, which induces photomultiplication. Owing to the acceptor-free and covalently interconnected photoactive layer in the suggested PM-OPDs, superior operational and thermal stabilities are observed. Finally, finely patterned B-/G-/R-selective PM-OPD arrays that enable the construction of highly sensitive passive matrix-type organic image sensors are demonstrated.

Keywords: exciton scissoring; organic image sensors; perfluoroarenes; photomultiplication.

Abstract

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