Design and characterisation of graphene‐based nano‐photodiode array device for photo‐stimulation of subretinal implant

Moorthy, Vijai M.; Sugantharathnam, Mary; Rathnasami, Joseph Daniel; Pattan, Shanmugaraja

doi:10.1049/mnl.2019.0030

Cited by 9 publications

(5 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nanomaterials used in that work increased the BHJ performance for subretinal implants. In this present research work, the authors continue the previous work [ 38 , 39 , 40 , 41 , 42 ] by proposing an improved PHJ device using different nanomaterials in comparison with the reported works. In this present research work, the PHJ-based OSC structure (ITO/s-SWCNT/C 70 /Al) has been analyzed.…”

Section: Introductionsupporting

confidence: 62%

“…The active layer materials s-SWCNT and C 70 are chosen because of the thermal stability. s-SWCNT remains stable at temperatures T from 300 K up to 2000 K. C 70 fullerite is more stable than C 60, the C 70 remains stable at temperatures T from 300 K up to 1050 K [ 38 , 39 , 40 ]. Hydrogen bonding in PHJ solar cell plays a major role, this helps to improve the performance of the device.…”

Section: Device Modeling and Simulationmentioning

confidence: 99%

“…In previous research work, Moorthy et al [ 38 , 39 , 40 ] analyzed the BHJ and PHJ topologies utilizing various nanomaterials and successfully fabricated and evaluated a subretinal implant NPD device. The nanomaterials used in that work increased the BHJ performance for subretinal implants.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Device Modelling and Optimization of Nanomaterial-Based Planar Heterojunction Solar Cell (by Varying the Device Dimensions and Material Parameters)

Moorthy

Srivastava

2022

Nanomaterials

Self Cite

View full text Add to dashboard Cite

The objective of this work is to model a multi-disciplinary (multi-physics) organic photovoltaic (OPV) using mathematical modeling and analyzing the behavior of a standard planar heterojunction (PHJ) or bi-layer thin-film photovoltaic device, supporting the optimization of an efficient device for future production and assisting in evaluating and choosing the materials required for the efficient device. In order to increase photodiode performance, the device structure and geometrical properties have also been optimized and evaluated. In this work, the effects of varying the device size and transport parameters on the performance parameters of a PHJ OPV structure comprised of Indium Tin Oxide as the anode (ITO), semiconducting single-wall carbon nanotube (s-SWCNT) as the donor, fullerene C70 as the acceptor, and Aluminium (Al) as the cathode have been analyzed. The conclusion suggests that a highly effective ITO/s-SWCNT/C70/Al PHJ solar cell may be fabricated if the suggested device is appropriately built with a thin layer and a high exciton diffusion length, bi-molecular recombination coefficient, and improved mobility charge carriers, in particular hole mobility in the cell’s donor layer. In addition, the displayed current–voltage (I–V) characteristics of the proposed PHJ device are clearly indicated, with the ITO/s-SWCNT/C70/Al combination having the greatest short-circuit current density (Jsc) value of 5.61 mA/cm2, open-circuit voltage (Voc) of 0.7 V, fill factor (FF) of 79% and efficiency (ɳ) of 3.1%. Results show that the electrical performance of organic solar cells is sensitive to the thickness of the photoactive substance. These results open the path for developing inexpensive and highly efficient solar cells.

show abstract

Section: Introductionsupporting

confidence: 62%

Section: Device Modeling and Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Device Modelling and Optimization of Nanomaterial-Based Planar Heterojunction Solar Cell (by Varying the Device Dimensions and Material Parameters)

Moorthy

Srivastava

2022

Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Taken together, IPMC with MCC–CNT electrodes in model B were the most efficient options to restore the eyelid movements in patients with ptosis. The assessment of the effect of the rolled graphene layers on nanocomposites is also of great importance [ 58 , 59 , 60 ]. Table 2 shows the changes in electrical properties of MCC–CNT electrodes in different weight percentages and numbers of CNT under two rolled graphene layers: multi-wall CNT (MWCNT) and single-wall CNT (SWCNT).…”

Section: Discussionmentioning

confidence: 99%

Enhanced Ionic Polymer–Metal Composites with Nanocomposite Electrodes for Restoring Eyelid Movement of Patients with Ptosis

et al. 2023

View full text Add to dashboard Cite

The present study aims to use enhanced ionic polymer–metal composites (IPMC) as an artificial muscle (a soft-active actuator) to restore eyelid movement of patients with ptosis. The previous eyelid movement mechanisms contained drawbacks, specifically in the lower eyelid. We used finite element analysis (FEA) to find the optimal mechanism among two different models (A and B). In addition to common electrodes of IPMC (gold and platinum), the bovine serum albumin (BSA) and microcrystalline cellulose (MCC) polymers, with optimal weight percentages of carbon nanotube (CNT) nanofiller, were also utilized as non-metallic electrodes to improve the efficiency of the IPMC actuator. In both models, IPMC with nanocomposite electrodes had higher efficiency as compared to the metallic electrodes. In model A, which moved eyelids indirectly, IPMC with MCC-CNT electrode generated a higher force (25.4%) and less stress (5.9 times) as compared to IPMC with BSA-CNT electrode. However, the use of model A (even with IPMCs) with nanocomposite electrodes can have limitations such as possible malposition issues in the eyelids (especially lower). IPMC with MCC-CNT nanocomposite electrode under model B, which moved eyelids directly, was the most efficient option to restore eyelid movement. It led to higher displacements and lower mechanical stress damage as compared to the BSA-CNT. This finding may provide surgeons with valuable data to open a window in the treatment of patients with ptosis.

show abstract

“…However, there are some drawbacks of previously reported works. To overcome those issues, Moorthy et al (2019) recently reported bulk hetero junction (BHJ)-based nano photodiode array (NPDA)-utilizing organic photodiodes, featuring a graphene/semiconducting single-wall carbon nanotube (s-SWCNT/C 60 )/ aluminum (Al) pattern, and featuring 1600 electrodes (Figure 1)-as the ideal solution to this problem. The authors evaluated design optimization and developed and tested an NPDA device using conjugated polymers and nanomaterials to restore sight to patients blinded by degenerative retinal diseases in this work.…”

Section: Introductionmentioning

confidence: 99%

Geometrical Optimization and Simulation of NPDA Device for Future Use in Retinal Implant

Moorthy

Srivastava

2023

The Journal of Technology, Management, and Applied Engineering

View full text Add to dashboard Cite

The focus of this research was to improve the device structure and electrode geometry of nanophotodiode array (NPDA) subretinal implant devices for retinal implants, with the aim to restore the sight of people who have lost their vision and visual acuity (VA) to better than blindness level. In light of the electronic device simulator, the authors present a design depicting the configuration of a high-efficiency NPDA device by incorporating organic nanomaterials. The present researchers’ simulated NPDA device embeds 3600 stimulating pixels (100 μm in diameter) dispersed over a 5.5-mm active radius area. By optimizing the NPDA device geometry, authors demonstrated that each pixel has the potential to produce the required electrical current and voltage for neuronal stimulation utilizing an irradiance of 12 mW/mm2. Here, the authors concentrated on increasing the efficiency of the device because the increase in efficiency will tend to result in more pixels (greater number of electrodes by reducing the electrode geometry) if the increase in a pixel increases the visual perception. Therefore, theoretically, the 100-μm Tin electrode can reinstate VA up to 20/80.This NPDA implant has the potential to reinforce vision to a level of VA that is superior to that of the vision loss level.

show abstract

Design and characterisation of graphene‐based nano‐photodiode array device for photo‐stimulation of subretinal implant

Cited by 9 publications

References 55 publications

Device Modelling and Optimization of Nanomaterial-Based Planar Heterojunction Solar Cell (by Varying the Device Dimensions and Material Parameters)

Device Modelling and Optimization of Nanomaterial-Based Planar Heterojunction Solar Cell (by Varying the Device Dimensions and Material Parameters)

Enhanced Ionic Polymer–Metal Composites with Nanocomposite Electrodes for Restoring Eyelid Movement of Patients with Ptosis

Geometrical Optimization and Simulation of NPDA Device for Future Use in Retinal Implant

Contact Info

Product

Resources

About