Near-infrared tandem organic photodiodes for future application in artificial retinal implants

article






Simone, G.

Rasi, D. di carlo

Vries, X. de

Heintges, G.H.L.

Meskers, S.C.J.

Janssen, R.A.J.

Gelinck, G.H.
Photovoltaic retinal prostheses show great potential to restore sight in patients suffering from degenerative eye diseases by electrical stimulation of the surviving neurons in the retinal network. Herein, organic photodiodes (OPDs) sensitive to near-infrared (NIR) light are evaluated as photovoltaic pixels for future application in retinal prostheses. Single-junction and tandem OPDs are compared. In the latter, two nominally identical single-junction cells are processed on top of each other, effectively doubling the open-circuit voltage (VOC). Both single-junction and tandem OPD micropixels can deliver the required charge to stimulate neurons under pulsed NIR light at physiologically safe intensities when connected to stimulating microelectrodes in a physiological saline solution. However, only tandem OPD pixels can cover the entire charge per pulse neural stimulation window due to their higher VOC (≈1.4 V). This demonstrates the viability of high-resolution retinal prostheses based on flexible OPD arrays.
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Bulk heterojunctionsNeural stimulationOrganic photovoltaicsRetinasTandem cellsElectrophysiologyHeterojunctionsMicroelectrodesOpen circuit voltageOphthalmologyPhotodiodesPixelsProstheticsSodium chlorideInfrared devicesElectrodesInfrared RaysNeuronsVisual Prosthesis
TNO Identifier
955038
Repository link
https://resolver.tno.nl/uuid:98056835-b6cb-439e-9ad7-049da61d18c1
ISSN
09359648
Source
Advanced Materials, 30(51)
Publisher
Wiley-VCH Verlag
Article nr.
1804678
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