High-Performance, Flexible, Inkjet Printed Heterostructure Photodetector for Biosensing Applications
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.69
High-Performance, Flexible, Inkjet Printed Heterostructure Photodetector for Biosensing Applications Ridwan F. Hossain1,2, Misook Min1,2, Anupama B. Kaul1,2* 1
Department of Materials Science and Engineering, PACCAR Technology Institute
2
Department of Electrical Engineering, University of North Texas; Denton, TX 76207
*Email: [email protected]
ABSTRACT
Age-related macular degeneration (AMD), a retinal degenerative disease that results in a continuous degeneration of photoreceptors in the retina, which eventually leads to complete blindness. One approach to combat AMD is through the use of artificially implantable photodetectors that are physically placed on the retina. Interestingly, 2D materials such as photosensitive and semiconducting molybdenum disulfide (MoS 2) and electrically conducting graphene have recently received tremendous promise due to their unique photonic and optoelectronic properties and their potential in various types of micro and nano-devices. In this study, a highly biocompatible 2D graphene-MoS2 photodetectors on a flexible polyimide substrate were designed, fabricated using inkjet printing to form photosensitive pixels and tested as a function of photo intensity and strain. The inkjet printed 2D heterostructure devices were photoresponsive and the photocurrent scaled proportionally with the incident light intensity, exhibiting a photoresponsivity R ~ 0.30 A/W at room temperature. The straindependent measurements of photocurrent with bending showed a photocurrent of Iph ~ 1.16 μA with strain levels for curvature up to ~ 0.262 cm-1. Inkjet printed graphene and MoS2 inks were also characterized using techniques such as Raman Spectroscopy, Photoluminescence (PL) and Scanning Electron Microscopy (SEM).
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INTRODUCTION Age-related macular degeneration (AMD) is a common condition of vision loss among older people, which causes damage to the macula near the retina. A blurred or blank spots in the central vision may appear and the objects also may not appear to be as bright as they used to be as AMD progresses [1]. Although the pharmaceutical treatments have been developed to slow down the progression of AMD, no method has been developed to halt it completely [2]. An alternative approach is the artificially implantable photodetectors on the retina, which has the potential to be in intimate contact to retinal pigment epithelium, as well as, to increase areal coverage, where photodetector pixels can be constructed to enhance the field of view by collecting more of the incoming radiation and focusing it onto the retina. Two-dimensional (2D) layered materials, such as graphene, molybdenum disulfide (MoS 2) have shown promise for a wide range of semiconducting devices, which can be for
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