Dark and photoconductive properties of hydroxymethylferrocene

Influence of annealing on the surface semiconductive and photoconductive properties of nanostructured cadmium sulfide thin films

“…3b) may be due to the corresponding decrease in the factor of n 0 /h as evident from Eq. 6 and similar temperature dependence of V t has also been reported in the case of metallocene [50]. Photoconduction as a function of photoexcitation wavelength in nanostructured CdS thin films annealed at different temperatures When the nanostructured CdS thin films annealed at different temperatures were photoexcited after the measurement of dark currents, an enhancement in current upon photoexcitation was noticed in each case i.e., photoconduction was observed and the extent of enhancement in photocurrent was found to depend on the photoexcitation wavelength as well as the annealing temperature of the CdS thin films at a fixed bias voltage.…”

“…The estimated values of dark activation energy are different for the ohmic and SCLC regions. This shows that the nanostructured CdS thin films are non-extrinsic [50]. A small decrease in V t with increasing sample cell temperature (as shown in the inset of Fig.…”

“…where the exponent c is the characteristic of the photoconducting system [45,50], and it depends on the amount of recombination of the photogenerated charge carriers during transport to the electrodes. A plot of log I ph versus logI B yields a straight line (as in Fig.…”

“…In the case of organic/organometallic materials, the temperature (T) dependence of the steady-state photoconductivity (I ph ) generally follows the expression [38,50]:…”

“…In general, the photoactivation energy values are much lower than the dark activation energy values ( Table 2). The difference in the activation energy values in the dark and under illumination of light is evident due to the change in the carrier density and its distribution in different energy states and traps under illumination of light [50]. It should be mentioned here that for Figure 10 shows the plot of dark activation energy and photoactivation energy versus annealing temperature for the nanostructured CdS thin films at a bias voltage of 10 V. For the annealing temperatures in the range of 100-450°C, the dark activation energy and photoactivation energy values show a similar nature with increasing annealing temperature.…”