Aggregates-induced dynamic negative differential resistance in conducting organic films

Xie, Xian Ning; Wang, Junzhong; Loh, Kian Ping; Wee, Andrew Thye Shen
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p203302
Academic Journal
This letter reports the negative differential resistance (NDR) behavior of perylene-3,4,9,10-tetracarboxylic-3,4,9,10-dianhydride films induced by aggregate formation in the film. It is observed that aggregate-states in the energy gap can by-pass the common charge conduction mode, and electron injection, trapping, and conduction through these states lead to the NDR characteristic. The rate-dependence of NDR is discussed in terms of the transit time and lifetime of the aggregates-states electrons. The quenching of NDR by photoillumination is also observed, and is attributed to the saturation of aggregates-states by photoelectrons.


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