Fig. 1: High-density POLYRETINA device. | Communications Materials

Fig. 1: High-density POLYRETINA device.

From: Photovoltaic retinal prosthesis restores high-resolution responses to single-pixel stimulation in blind retinas

Fig. 1

a Picture of the high-density POLYRETINA prosthesis with 10,498 photovoltaic pixels. b Magnified view of the 80-µm diameter and 120-µm pitch photovoltaic pixels. c Sketch of the cross-section structure of the POLYRETINA photovoltaic interface before bonding to the hemispherical dome. The layer’s thicknesses are as follow base PDMS layer: 50 μm; SU-8 platforms: 6 μm; second PDMS layer embedding SU-8 platforms: 15 µm; PEDOT:PSS: 50 nm, P3HT:PCBM: 100 nm, Ti-TiN: 80–60 nm, final PDMS layer: 4 μm. PDMS polydimethylsiloxane, PEDOT poly(3,4-ethylenedioxythiophene), PSS poly(styrenesulfonate), P3HT regioregular poly(3-hexylthiophene-2,5-diyl), PC60BM [6,6]-phenyl-C61-butyric acid methyl ester, Ti titanium, TiN titanium nitride. d Tensile strain simulated at the level of TiN. e Tensile stress simulated at the level of TiN.

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