High response organic ultraviolet photodetector based on blend of 4,4′,4″-tri-(2-methylphenyl phenylamino) triphenylaine and tris-(8-hydroxyquinoline) gallium

Zisheng Su; Wenlian Li; Bei Chu; Tianle Li; Jianzhuo Zhu; Guang Zhang; Fei Yan; Xiao Li; Yiren Chen; Lee, Chun-Sing
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p103309
Academic Journal
The authors demonstrate high response organic ultraviolet (UV) photodetector (PD) using 4,4′,4″-tri-(2-methylphenyl phenylamino) triphenylaine (m-MTDATA) and tris-(8-hydroxyquinoline) gallium (Gaq3) to act as the electron donor and acceptor, respectively. The m-MTDATA:Gaq3 blend device shows a photocurrent of 405 μA/cm-2 at -8 V, corresponding to a response of 338 mA/W under an illumination of 365 nm UV light with an intensity of 1.2 mW/cm2. The high response is attributed to the enhanced dissociation of geminate hole-electron pairs in the distributed heterojunction of the blend and suppression of radiative decay. Photophysics of the PD involved is also discussed in terms of the performance and device structures.


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