Abstract
The charge storage behavior of a floating gate memory device using carbon nanotube-CdS nanostructures embedded in Bombyx mori silk protein matrix has been demonstrated. The capacitance – voltage characteristics in ITO/CNT–CdS-silk composite/Al device exhibits a clockwise hysteresis behavior due to the injection and storage of holes in the quantized valence band energy levels of CdS nanocrystals. The enhanced charge injection resulting in increase in memory window is observed at higher sweeping voltages. Nearly frequency independent hysteresis width over a wide range of 100kHz–2.0MHz, indicates its origin due to the charge storage in nanocrystals. The memory behavior of carbon nanotube–CdS nanostructures/silk nanocomposite devices has also been demonstrated on polyethylene terephthalate substrates, which may provide the way for flexible, transparent and printable electronic devices.
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