Mesoporous extinction coefficients

A sensitizer is of paramount importance to photovoltaic performance. The sensitizer is attached to the surface of a mesoporous wide band-gap semiconductor serving as electron transporter. While the trivial ultraviolet absorption for 375 with a molar extinction coefficient (s) of 50.0 x 103 M [ cm-1 peaks at 372 nm, the s value of its low-energy band at 525 nm (mainly stemming from the intramolecular charge transfer transition) is 44.8 x 103 IVT1 cm-1 (08JA9202). 

Here, a and c are the optical absorption cross section of the sensitizer and its concentration in the mesoporous film, respectively. The value of <7 can be derived from the decadic extinction coefficient e of the sensitizer using the relation ... 

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