Light-induced switching in back-gated organic transistors with built-in conduction channel

V. Podzorov, V. M. Pudalov, M. E. Gershenson

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


We report an observation of light-induced switching of conductance in back-gated organic field-effect transistors (OFETs) with a built-in conduction channel. In the studied devices, the built-in channel is formed owing to the self-sensitized photo-oxidation of the rubrene surface. In the dark, the back gate controls charge injection from metal contacts into the built-in channel: The high-current ON state corresponds to zero or negative back gate voltage; the low-current OFF state-to a positive back gate voltage that blocks the Schottky contacts. Illumination of an OFET in the OFF state with a short pulse of light switches the device to the ON state, which persists in the dark for days. The OFF state can be restored by cycling the back-gate voltage. The observed effect can be explained by screening the back-gate electric field with the charges photogenerated in the bulk of organic semiconductor.

Original languageEnglish (US)
Pages (from-to)6039-6041
Number of pages3
JournalApplied Physics Letters
Issue number24
StatePublished - Dec 13 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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