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  • 文献标题:   Design and characterisation of graphene-based nano-photodiode array device for photo-stimulation of subretinal implant
  • 文献类型:   Article
  • 作　　者:   MOORTHY VM, SUGANTHARATHNAM M, RATHNASAMI JD, PATTAN S
  • 作者关键词:   photoconductivity, eye, solar cell, disease, graphene, biomedical electrode, prosthetic, photodiode, vision defect, nanophotonic, nanomedicine, singlewall carbon nanotube, semiconductor nanotube, prosthetic power supplie, energy harvesting, c, al, size 100 mum, voltage 0, 31 v, size 150, 0 mum, organic photovoltaicbased nanophotodiode array, macula degeneration, retinal disorder, retinal prosthesis application, retinal implant, retinitis pigmentosa, subretinal implant, graphenebased nanophotodiode array device, npda array, bhj cell employed photodiode array, photocurrent density, npda device, c60 semiconductor layer, semiconducting single wall carbon nanotube, graphene alone bottom anode, bulk heterojunction solar cell technology, subretinal stimulation, degenerative retinal disease
  • 出版物名称:   MICRO NANO LETTERS
  • ISSN:  
  • 通讯作者地址:   Annamalai Univ
  • 被引频次:   0
  • DOI:   10.1049/mnl.2019.0030
  • 出版年:   2019

▎ 摘　　要

Electrically stimulating the retina of the patients suffering due to extreme retinal disorders such as age related macula degeneration, retinitis pigmentosa is quickly turning into a feasible accomplishment through retinal implants. The objective of this work is to optimise the design, develop and test an organic photovoltaic based Nano Photo Diode Array (NPDA) device for retinal prosthesis application to restoring vision to patients blinded by degenerative retinal diseases. NPDA for subretinal stimulation has been fabricated based on Bulk heterojunction (BHJ) solar cell technology. Each pixel is composed by a graphene alone bottom anode, a semiconducting single wall carbon nanotube (S-SWCNT):C60 blend, and a top cathode in aluminum (Al) of 100 mu m or 150 diameter. This NPDA device photovoltaically converts incident light into electric current to stimulate nearby retinal neurons without wired power connections. The fabricated device is able to provide a photo current density of 245 mu A/cm(2) and photovoltage of 0.31 V. These results suggest that BHJ cell employed photodiode array used in this work make it better than POLYRETINA and SCNC. The significant improvement in photocurrent density paves the way for scaling up density of NPDA array in implant. Increased number of electrodes will indeed enhance visual acuity to greater extent.