Increasing organic vertical carrier mobility for the application of high speed bilayered organic photodetector

Wu-Wei Tsai; Yu-Chiang Chao; En-Chen Chen; Hsiao-Wen Zan; Hsin-Fei Meng; Chain-Shu Hsu
November 2009
Applied Physics Letters;11/23/2009, Vol. 95 Issue 21, p213308
Academic Journal
The direct influence of the vertical carrier mobility on the frequency response of bilayered organic photodiodes (PDs) is investigated for the first time. With fullerene as the acceptor material, changing vertical hole mobility from 2.3×10-5 to 2.8×10-4 cm2/V s increases PD bandwidth from 10 to 80 MHz under a 4 V operation. The influence of deposition rate on vertical hole mobility of pentacene film is also discussed. Our results facilitate the application of bilayered organic PDs on the detection of very-high-frequency optical signals.


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