Fast-Response,Highly Air-Stable,and Water-Resistant Organic Photodetectors Based on a Single-Crystal Pt Complex |
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Authors: | Dharmaraj Periyanagounder Tzu-Chiao Wei Ting-You Li Chun-Ho Lin Théo Piechota Gonçalves Hui-Chun Fu Dung-Sheng Tsai Jr-Jian Ke Hung-Wei Kuo Kuo-Wei Huang Norman Lu Xiaosheng Fang Jr-Hau He |
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Affiliation: | 1. Computer, Electrical, and Mathematical Sciences and Engineering Division, King Abdullah University of Science & Technology, Thuwal, 23955–6900 Saudi Arabia;2. Computer, Electrical, and Mathematical Sciences and Engineering Division, King Abdullah University of Science & Technology, Thuwal, 23955–6900 Saudi Arabia
Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, 106 Taiwan, ROC;3. KAUST Catalyst Centre, Physical Science and Engineering Division, King Abdullah University of Science & Technology, Thuwal, 23955–6900 Saudi Arabia;4. Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, 106 Taiwan, ROC;5. Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, 106 Taiwan, ROC;6. Department of Materials Science, Fudan University, Shanghai, 200433 China |
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Abstract: | Organic semiconductors demonstrate several advantages over conventional inorganic materials for novel electronic and optoelectronic applications, including molecularly tunable properties, flexibility, low-cost, and facile device integration. However, before organic semiconductors can be used for the next-generation devices, such as ultrafast photodetectors (PDs), it is necessary to develop new materials that feature both high mobility and ambient stability. Toward this goal, a highly stable PD based on the organic single crystal PtBr2(5,5′-bis(CF3CH2OCH2)-2,2′-bpy)] (or “Pt complex (1o)”) is demonstrated as the active semiconductor channel—a material that features a lamellar molecular structure and high-quality, intraligand charge transfer. Benefitting from its unique crystal structure, the Pt-complex (1o) device exhibits a field-effect mobility of ≈0.45 cm2 V?1 s?1 without loss of significant performance under ambient conditions even after 40 days without encapsulation, as well as immersion in distilled water for a period of 24 h. Furthermore, the device features a maximum photoresponsivity of 1 × 103 A W?1, a detectivity of 1.1 × 1012 cm Hz1/2 W?1, and a record fast response/recovery time of 80/90 µs, which has never been previously achieved in other organic PDs. These findings strongly support and promote the use of the single-crystal Pt complex (1o) in next-generation organic optoelectronic devices. |
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Keywords: | fluorine functionalization metal–ligand charge transfer organic photodetectors organic semiconductors transfer integrals |
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