By Mario Pagliaro, Giovanni Palmisano, Rosaria Ciriminna
With the decline within the world's traditional assets, the necessity for brand new and less expensive power resources is evolving. One such resource is the solar which generates light and heat which are harnessed and used to our advantage.
This reference booklet introduces the subject of photovoltaics within the type of versatile sunlight cells. There are motives of the rules in the back of this expertise, the engineering required to supply those items and the longer term percentages provided via this technology.
The chemistry and physics of the cells (both natural and inorganic) are clarified in addition to construction equipment, with info how this may then be utilized to the nanoscale as well.
an entire consultant to this new and fascinating method of manufacturing strength in an effort to be important to various humans from fabric scientists, chemists, electric engineers, to administration specialists and politicians.
Read Online or Download Flexible Solar Cells PDF
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Extra info for Flexible Solar Cells
17 Better utilization of the solar spectrum through the multijunction approach. 4 Multiple Junction Cells The tandem or multicolor cell uses the strategy of increasing the number of energy levels. Solar cells consisting of p–n junctions in different semiconductor materials of increasing bandgap are placed on top of each other, such that the highest bandgap intercepts the sunlight ﬁrst. The elegance of the approach – ﬁrst suggested by Jackson in 1955 – is that both spectrum splitting and photon selectivity are automatically achieved by the stacking arrangement.
When illuminated, the solar cell produces a photocurrent proportional to the light intensity. This photocurrent is divided by the load and the diode, in a ratio that depends on the light intensity and on the load resistance. In real cells, power is dissipated through the contact resistance and through leakage currents around the sides of the device. 13. 12 The solar cell is equivalent to a current generator in parallel to a resistive diode. (Reproduced from Ref. , with permission). 13 Effect of (a) increasing series resistance and (b) reducing parallel resistance on the current–voltage curve.
It thus follows that, for an ideal diode, V OC ¼ kB T ln(J SC þ1) q Jo ð2:9Þ In other words, the VOC increases logarithmically (and thus very slowly) with light intensity. 11 shows that the cell generates power when the voltage is between 0 and VOC. At V < 0 the cell acts as a photodetector, consuming power to generate a photocurrent. In certain cases, in this diode regime, the dark current in solar cells is accompanied by emission of light. 12). It is this diode that establishes a photovoltage enabling the photocurrent through the load.