Light current

Fig. 13. Characteristics of a 50-)J.m long DFB laser, (a) Light-current properties, (b) spectral intensity plotted on a logarithmic scale to better illustrate...

When we derivatize the solvent-exposed oxide interfaces with an electrical insulator (described below), this cannot create an electrical junction. Yet, it does impart diodelike character to the dark and light currents measured with FeCp 2/0, that is, derivitization creates an electrochemical overpotential for the recombination reactions, just as there is naturally an overpotential for the reduction of I2/I3. This leads to the general conclusion that slowing the recombination reaction ) relative to the photodriven forward reactions, by whatever mechanism, establishes the necessary conditions for a successful photoconversion process. 

Figure 22. Anomalous photoeifect (APE) showing cross-over of the dark and light current-voltage curves for an n-type semiconductor-based interface. The dashed line is obtained as described in the text.

Fig. 2. Left light/current/voltage profile (recorded at 0.2 V/s) for a Ru(bpy)32+/TPA solution right (A) live image and (B) ECL image of Ru(bpy)32+-conjugated heavy-...

Carefully evaporate the combined extracts in a 250-ml beaker on a water bath. A light current of air over the beaker accelerates the evaporation process and reduces the risk of sensitive detergents being converted as a... 

Figure 18.2 Typical current-voltage characteristics for dark and light current in solar cells and the main photovoltaic parameters that define the device quality. Tc, short circuit current Voc, open circuit voltage FF, fill factor l ax nd V ax, the current and voltage values at the maximum power point rj, photoconversion...

Note that the light current and the short-circuit current differ numerically by the minority contact currents. Thus even though... 

The predominant wavelengths of ultraviolet (UV) light currently used in photomasking are 365 nm or above, but UV lamp spectra also contain significant energy in the actinic region below 315 nm. Normally, the... 

FIGURE 2.1 The dependence ofcurrents and potentials ofthe electrode with Zn-Pc film on the Pt substrate on the pH of the electrolyte. 1— 1, light-current 2—1, dark current 3— 1 1, photocurrent 4—U, light potential 5—dark potential 6—photopotential. 

Zhuze et al. [3]. The temperature dependence of is shown in Fig. 36a for -100 to -650 K. The thermal resistivity of the lattice 1/>.iat was determined by subtraction of the normal (calculated) electronic component 1/ iei from the experimental 1/ tot- It showed a decrease at high temperatures whereas theory predicts an increase. This is probably due to an anomalous behavior of the electronic component which is explained by the presence of a complex conduction band, consisting of subbands with heavy and light current carriers. The compound may be considered as a highly doped semiconductor with the Fermi level close to the bottom of the second band. The high values of 1/Xiat observed at low temperatures of -80 to 150 K are attributed to phonon scattering at the levels of the paramagnetic Ce ions split by the crystal field [1]-... 

---