Photoresponsive device with a photoresponsive zone comprising a

Details Photoresponsive device with a photoresponsive zone comprising a Photoresponsive device with a photoresponsive zone comprising a

1995-11-22

1997-09-23

Tran, Minh-Loan

Active solid-state devices (e.g., transistors, solid-state diode

Organic semiconductor material

257184, 257461, H01L 3524

Patent

active

056707916

ABSTRACT:
First and second electrodes (3 and 4) are provided on respective ones (2' and 2") of the first and second major surfaces of a photoresponsive zone (2). The photoresponsive zone (2) is in the form of a polymer blend having regions (2a) of a first semiconductive polymer and regions (2b) of a second semiconductive polymer phase-separated from the first semiconductive polymer. The second semiconductive polymer has an electron affinity greater than that of the first semiconductive polymer so that, in use of the device (1), a photocurrent between the first and second electrodes (3 and 4) resulting from light incident on the photoresponsive layer comprises electrons travelling predominantly through the second semiconductive polymer and holes travelling predominantly through the first semiconductive polymer.

REFERENCES:
patent: 5247190 (1993-09-01), Friend et al.
patent: 5350459 (1994-09-01), Suzuki et al.
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"Polymer Leds" R. Friend et al, Physics World, Nov. 1992, pp. 42-46.
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"The Physics of Structurally Disordered Matter: An Introduction" Chapter 9, Percolation and Localisation, N.E. Cusack, Iop Publishing Ltd.1987.
"Chemical Tuning of Electroluminescent Copolymers to Improve Emission Efficiencies and Allow Patterning" P.L. Burn et al, Nature, vol. 356, pp. 47-49, 1992.

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