Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

Jong-Woon Ha; Seung Hun Eom; Bo Kyung Cha; Seyeong Song; Hyeong Ju Eun; Jong H. Kim; Jong Mok Park; BongSoo Kim; Byoungwook Park; Seo-Jin Ko; Sung Cheol Yoon; Changjin Lee; In Hwan Jung; Do-Hoon Hwang

doi:10.1002/eem2.12750

Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (6) : e12750 DOI: 10.1002/eem2.12750

RESEARCH ARTICLE

Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

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¹. Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Korea

². Division of Advanced Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea

³. Electro-Medical Device Research Center, Korea Electrotechnology Research Institute (KERI), Ansan 15588, Korea

⁴. Graduate School of Carbon Neutrality, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea

⁵. Department of Molecular Science and Technology, Ajou University, Suwon 16449, Korea

⁶. Research Center for Advanced Specialty Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, Korea

⁷. Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea

⁸. Department of Organic and Nano Engineering, Human-Tech Convergence Program, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea

dohoonhwang@pusan.ac.kr

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Abstract

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency situations. However, this is quite challenging because of the heavy weight of the scintillator and silicon photodetectors. The weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic photodetectors. This study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer (∼700 nm), owing to the symmetric backbone and highly soluble molecular structure of bithienopyrroledione. The ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density (J_d ∼ 10⁻¹⁰ A cm⁻²) at a negative bias (−2.0 V) while maintaining high responsivity (R = 0.29 A W⁻¹) even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_sh* = 2.18 × 10¹³ Jones in the organic photodetectors. Printed organic photodetectors are developed by slot-die coating for use in X-ray detectors, which exhibit D_sh* = 2.73 × 10¹² Jones with clear rising (0.26 s) and falling (0.29 s) response times upon X-ray irradiation. Detection reliability is also proven by linear response of the X-ray detector, and the X-ray detection limit is 3 mA.

Keywords

low dark current / low detection limit / organic photodetector / printable / X-ray

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Jong-Woon Ha, Seung Hun Eom, Bo Kyung Cha, Seyeong Song, Hyeong Ju Eun, Jong H. Kim, Jong Mok Park, BongSoo Kim, Byoungwook Park, Seo-Jin Ko, Sung Cheol Yoon, Changjin Lee, In Hwan Jung, Do-Hoon Hwang. Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current. Energy & Environmental Materials, 2024, 7(6): e12750 DOI:10.1002/eem2.12750

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