Device structure dependence of the recording efficiency of organic bistable molecular memory using photochromic diarylethene (DAE) was studied. Devices with a thicker memory layer showed faster current decrease, that is, shorter writing time. This was attributed to effective isomerization at the many carrier traps in the memory layer. The device with an electron transport layer that consisted of a Silole derivative showed fast writing speed. The device with an Alq3 electron transport layer showed electroluminescence. This indicates the holes were transported through the DAE layer without contribution for isomerization. DAE molecules with good receptivity for both carriers should be developed for obtaining high speed memory.
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