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Selenide effect for oxidation stability of the organic solvent-free copper sulfide Nano-particles and its organic photodiode application.

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Title: Selenide effect for oxidation stability of the organic solvent-free copper sulfide Nano-particles and its organic photodiode application.
Authors: Jang, Woongsik1 (AUTHOR), Kwon, Young-Tae1,2 (AUTHOR), Lim, Hyo-Ryoung2 (AUTHOR), Choa, Yong-Ho1,2 (AUTHOR) choa15@hanyang.ac.kr, Wang, Dong Hwan1 (AUTHOR) king0401@cau.ac.kr
Source: Applied Surface Science. Aug2019, Vol. 484, p1253-1262. 10p.
Subjects: Copper sulfide, P-type semiconductors, Optoelectronic devices, Selenides, Oxidation, Potential energy
Abstract: The development of copper chalcogenide nanomaterials has shown a potential for advanced energy application, because copper chalcogenide are p-type semiconductors with high hole concentration. In this study, copper sulfide (CuS) was synthesized and alloyed with Se via a water-based method without the use of organic solvent. We demonstrated that Se alloying to CuS nano-particles (NPs) could improve oxidation stability of dispersion in aqueous solution. Through this, the NPs were integrated with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) into a simple mixing strategy, and used as a hole transporting materials with PEDOT:PSS for organic photodiodes (OPDs). OPD device with NPs showed suppressed dark current and remarkably enhanced detectivity in all wavelength regions due to formation of electron barrier compared to pristine PEDOT:PSS device. Moreover, when exposed to signal pulses, the photocurrent is improved, and the noise current is suppressed for the OPD with NPs. Therefore, incorporating stable copper chalcogenide NPs can improve performance, leading to cost-effective optoelectronic devices. Unlabelled Image • Se doped CuS NPs were synthesized in organic solvent-free system. • Se doping protected CuS NPs from surface oxidation was analyzed by Raman and XPS. • Dark currents were dramatically suppressed by electron barrier based on Se doped CuS NPs. • Signal current and noise current in OPD devices were investigated via real-time recording. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The development of copper chalcogenide nanomaterials has shown a potential for advanced energy application, because copper chalcogenide are p-type semiconductors with high hole concentration. In this study, copper sulfide (CuS) was synthesized and alloyed with Se via a water-based method without the use of organic solvent. We demonstrated that Se alloying to CuS nano-particles (NPs) could improve oxidation stability of dispersion in aqueous solution. Through this, the NPs were integrated with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) into a simple mixing strategy, and used as a hole transporting materials with PEDOT:PSS for organic photodiodes (OPDs). OPD device with NPs showed suppressed dark current and remarkably enhanced detectivity in all wavelength regions due to formation of electron barrier compared to pristine PEDOT:PSS device. Moreover, when exposed to signal pulses, the photocurrent is improved, and the noise current is suppressed for the OPD with NPs. Therefore, incorporating stable copper chalcogenide NPs can improve performance, leading to cost-effective optoelectronic devices. Unlabelled Image • Se doped CuS NPs were synthesized in organic solvent-free system. • Se doping protected CuS NPs from surface oxidation was analyzed by Raman and XPS. • Dark currents were dramatically suppressed by electron barrier based on Se doped CuS NPs. • Signal current and noise current in OPD devices were investigated via real-time recording. [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2019.04.166