Organic phototransistor based on intramolecular charge transfer in a bifunctional spiro compound

Saragi, Tobat P.I.; Pudzich, Robert; Fuhrmann, Thomas; Salbeck, Josef
March 2004
Applied Physics Letters;3/29/2004, Vol. 84 Issue 13, p2334
Academic Journal
We report on the fabrication of organic phototransistors based on the spiro-conjugated molecule 2,7-bis-(N,N[sup ′]-diphenylamino)-2[sup ′],7[sup ′]-bis(biphenyl-4-yl)-9,9[sup ′]-spirobifluorene. Intramolecular charge transfer leads to an increase in charge carrier density, providing the amplification effect. The sensitivity is better than 1 A/W for ultraviolet light at 370 nm, making the device interesting for sensor applications. © 2004 American Institute of Physics.


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