Polymer-based devices

Aside from dye-based cells, a good deal of study has been devoted to photovoltaic effects in polymer-based devices. Single-layer sandwich-type devices composed of aluminum—polyphenjienevinjiene—ITO have been fabricated with solution-cast polymer layers of These devices display... 

It is interesting to compare the EL response of the polymer-based device to that of the inorganic device. For time resolved measurements described below we used ac thin-film EL (ACTFEL) device, based on ZnS Cu, and commercially available from EL-AM, Jerusalem.17... 

Shown in Figure 7.9 transient EL response consists of two light flashes, both having the same decay pattern. Note that the time-scale associated with the EL decay in the case of inorganic device is of the order of microseconds to tens of microseconds, which is much longer than that of polymer-based device. 

Calculated in this way optimum frequency for inorganic device is equal to 33 kHz, that is in reasonable agreement with the experimentally measured value of 28 kHz. For our polymer device we get ro.25 = 0.4 /rsec, that corresponds to >o = 1 -25 MHz. So, the optimum ac-drive frequency for the polymer-based device is much higher than that for the inorganic device. 

In recent years great effort has been devoted to conjugated polymers as organic field-effect transistor (OFET) active layers [1]. An important parameter relevant to the operation of an OFET is the charge carrier mobility which determines the overall performance of any polymer-based devices. 

A typical definition that is often made when describing OLEDs is to categorize them as either small molecule or polymer-based devices. However, this distinction is somewhat misleading since small molecule- and polymer-based OLEDs do not markedly differ in their operating principles. The mechanistic discussions given Section 12.04.2.1 apply equally well to both types of devices. A more logical way to differentiate OLEDs is by the fabrication method. Molecular materials (typically referred to as small molecules) can be distilled or sublimed at reduced pressure, and are... 

Table 7 OLED performance parameters for polymer-based devices, utilizing organoiridium emitters... 

Carpi, F., De Rossi, D., 2005. Electroactive polymer-based devices for e-textiles in biomedicine. IEEE Transactions of Information Technology in Biomedicine 9 (3), 295—318. 

Islam MR, Serpe MJ (2014) Polymer-based devices for the label-free detection of DNA in solution low DNA concentrations yield large signals. Anal Bioanal Chem 406 4777... 

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