Photovoltaic cells energy diagram

Fig. 2. Schematic energy diagram of a semiconductor/redox system/metal regenerative photovoltaic cell...

Fig. 10-33. Energy diagram for a photovoltaic cell composed of a metal cathode and an n>type semiconductor anode Vpi, = cell voltage in operation at current <.

Figure 10-34 shows the energy diagram of an operating photovoltaic cell which consists of a photoexcited anode of n-type semiconductor and a photoexdted cathode of p-lype semiconductor. The electromotive force, of this type of photovoltaic cell approximately equals the difference between the flat band potential of the n-type anode and the flat band potential fEg, of the p-type cathode as shown in Eqn. 10-62 ... 

Fig. 11.1 Energy level diagram for an electrochemical photovoltaic cell using an n-type semiconductor electrode...

At this voltage (U = f/ph), the anodic photocurrent and the cathodic dark current are equal. This is called the open-circuit condition as illustrated in the energy diagram (Fig. 11.1b). The conversion efficiency tj of a photovoltaic cell is defined as... 

Fig. 31. Energy level diagram of a photovoltaic cell, Nesa glass/HjPc (7)/In before and after contact...

In principle, an electrochemical photovoltaic cell can be constructed very simply. It consists of a semiconductor electrode, an electrolyte containing a redox system, and an inert counter electrode. The energy diagram for a cell with an n-type semiconductor and a redox system with a potential close to the valence band is shown in Figure 11.1. In the upper part of this figure, the equihbrium condition... 

Figure 7.16 (a) Device structure of the OSCs. (b) Energy band diagram for the photovoltaic cells in this study. (Reprinted from ref. 81, with permission from Elsevier, http //www.sciencedirect.com/science/article/pii/ S1566119909001396.1... 

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