Transparent polymer Schottky contact for a high performance visible-blind ultraviolet photodiode based on ZnO

Nakano, M.; Makino, T.; Tsukazaki, A.; Ueno, K.; Ohtomo, A.; Fukumura, T.; Yuji, H.; Akasaka, S.; Tamura, K.; Nakahara, K.; Tanabe, T.; Kamisawa, A.; Kawasaki, M.
September 2008
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p123309
Academic Journal
We report on a high performance visible-blind Schottky ultraviolet photodiode composed of a ZnO (0001) bulk single crystal and a transparent conducting polymer, poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate), fabricated with a simple spin-coating process at room temperature in air. The quantum efficiency as high as unity in ultraviolet region and a visible rejection ratio of about 103 were achieved in the spectral response of the photodiode under zero-bias condition. The normalized detectivity of the photodiode was evaluated to be 3.6×1014 cm Hz1/2/W at 370 nm.


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