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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.43: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Nanostructured organic photodiode with adaptable sensitivity — •Steve Pittner and Veit Wagner — Jacobs University Bremen, Germany

Organic materials show promising properties for cheap and high volume manufacturing of electronic devices. For light detection a drawback of those materials is the short electron-hole pair (exciton) diffusion length of usually far less than 100 nm. Thus, in order to built an effective organic photodiode the geometrical dimensions have to be small, so that all excitons can dissociate in the strong fields at the contacts or internally built-in interfaces. Subsequently the separated e⁻ and h⁺ will drift to their appropriate contact. The approach of using a nanoscale lateral finger structure compared to the commonly used stacked layer geometry shows two advantages. An now possible additional gate electrode offers the option to tune the sensitivity of such an organic photodiode. Furthermore, no transparent and electrical conductive encapsulation is required so that a transparent insulating polymer can be used here. This approach is shown for devices made of dihexyl-sexithiophene (DH6T) or the polymer P3HT as photosensitive organic semiconductor on Si/SiO₂ substrate.