Open circuit voltage ohmic shorting

The optical properties of electrodeposited, polycrystalline CdTe have been found to be similar to those of single-crystal CdTe [257]. In 1982, Fulop et al. [258] reported the development of metal junction solar cells of high efficiency using thin film (4 p,m) n-type CdTe as absorber, electrodeposited from a typical acidic aqueous solution on metallic substrate (Cu, steel, Ni) and annealed in air at 300 °C. The cells were constructed using a Schottky barrier rectifying junction at the front surface (vacuum-deposited Au, Ni) and a (electrodeposited) Cd ohmic contact at the back. Passivation of the top surface (treatment with KOH and hydrazine) was seen to improve the photovoltaic properties of the rectifying junction. The best fabricated cell comprised an efficiency of 8.6% (AMI), open-circuit voltage of 0.723 V, short-circuit current of 18.7 mA cm, and a fill factor of 0.64. 

If all the losses that we have looked at, activation, ohmic and concentration, are combined then the actual operational graph of a fuel cell, the J-V curve, is produced. The current is usually expressed as current density J, i.e. the quotient of the current divided by the geometrical surface of the electrodes. Thus from the j-V curve, we can get the short-circuit current density Jsc, the open-circuit voltage Vqc, and the fuel cell power density, i.e., the J x V product All of these parameters are very important in the evaluation of the photocatal)dic fuel cell performance. 

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