Incident monochromatic photon-to-current conversion efficiency

The incident monochromatic photon-to-current conversion efficiency (IPCE), also called external quantum efficiency, is defined as the number of electrons generated by light in the external circuit divided by the number of incident photons as a function of excitation wavelength. It is expressed in Equation (7).29 In most cases, the photoaction spectrum overlaps with the absorption spectrum of the sensitizer adsorbed on the semiconductor surface. A high IPCE is a prerequisite for high-power photovoltaic applications, which depends on the sensitizer photon absorption, excited state electron injection, and electron transport to the terminals ... 

IPCE Incident monochromatic photon-to-current conversion efficiency... 

The incident monochromatic photon-to-current conversion efficiency (IPCE) is plotted as a function of excitation wavelength. The IPCE value in the plateau region is 80% for complex 2, while for complex 25 it is only about 66%. In the red region, the difference is even more pronounced. Thus, at 700 nm the IPCE value is twice as high for the fully protonated complex 2 as compared to the deprotonated complex 25. As a consequence, the short circuit photocurrent is 18-19 mAcrn-2 for complex 2, while it is only about 12-13 mA cm-2 for complex 25. However, there is a trade-off in photovoltage, which is 0.9 V for complex 25, as compared to 0.65 V for complex 2. Nevertheless, this is insufficient to compensate for the current loss. Hence, the... 

The incident monochromatic photon-to-current conversion efficiency (IPCE), sometimes referred to also as the external quantum efficiency (EQE), is another fundamental measurement of the performance of a device. The IPCE value corresponds to the photocurrent density generated in the external circuit under monochromatic illumination of the DSSC divided by the photon flux that strikes the cell [6]. From such an experiment, the IPCE as a function of wavelength can be calculated from the following formula ... 

Fig. 5 Photocurrent vs potential plot recorded for a ca. 45 pm thick nanoparticulate Ti02 film, immersed in a 0.1 M HCIO4/0.1 M HCOOH solution and irradiated with a 300-nm monochromatic light (700 pW cm ) from the side of the film/solution boundary. On the left axis is represented the corresponding incident photon-to-current conversion efficiency (IPCE). In the insert is represented schematically (marked in grey ) the illuminated part of the Ti02 film where the electron injection takes place. (Reproduced with permission from [12])...

The short circuit photocurrent, Jsc, is defined as integral over the solar spectrum of the monochromatic incident photon to current conversion efficiency (IPCE) of the solar cell under short circuit cmiditions ... 

In addition to being bound to T1O2 by carboxylate groups, this triruthenium(II) complex can be bound by peripheral sulfonate groups. These complexes absorb over a very broad range in the visible region of the spectrum, and monochromatic incident photon-to-current conversion efficiencies of over 80% have been observed... 

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