Photon-current conversion efficiency curves

Eigure 53. Photon-current conversion efficiency curves as a function of wavelength of the incident light for the sensitizers (-A-)[ Ru (dcbpy)2Cl 2(BPEB)] (l) (- -) [ Ru(bpy)2Cl 2(BPEB)] + (2), and (- -)[Ru(bpy)2Cl(BPEB)] + (3), and for bare Ti02(-H-). The absorption spectrum of the binuclear species 1 in aqueous solution is also shown (full line). 

Photovoltaic performance of the DSSC is described as follows Figure 8 shows the external spectral response curve of the photocurrent for nanocrystalline Ti02 solar cells sensitized by N3 and black dyes with the I /If redox mediator, where the incident photon-to-current conversion efficiency (IPCE) is represented as a function of wavelength. IPCE is obtained by the following equation ... 

The N3 and N719 dyes (Table 38.1) show the highest incident photon-to-current conversion efficiency (IPCE) as compared with other dyes. When the optical properties of the dyes are taking into consideration, there are two quantum efficiencies (QEs), that is, an external quantum efficiency (EQE) and an internal quantum efficiency (IQE) [43]. EQE includes the effect of optical losses by transmission and reflection, while IQE refers to the efficiency of the photons that are not reflected or transmitted out of the cell [43]. From the reflection and transmission of a solar cell, the EQE curve can be corrected to obtain the internal quantum efficiency curve [43]. IPCE is related to EQE and therefore IPCE depends on the absorption of light as well as the collection of charges. 

Evaluation of an SC photovoltaic performance is usually accomplished with a set of tests. Those involve measurements of the current-voltage (I-V) curves for the cell in the dark and under light illumination, fluorescent decay upon photoexcitation, determination of the incident photon-to-electron-conversion efficiency (TPCE), etc. 

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