Pop, S.D.; Kate, S.P.; Hinrichs, K.; Rappich, J.: Tunable optical constants of thermally grown thin porphyrin films on silicon for photovoltaic applications. Solar Energy Materials and Solar Cells 127 (2014), p. 169-174
10.1016/j.solmat.2014.04.032
Abstract:
The possibility to tune optical constants of porphyrins, only by varying the core substituents of the molecules, endorse them as promising thin film materials for dye-sensitized- or hybrid molecular heterojunction- solar cells. For the design and improvement of such optical devices involving porphyrin layers, exact knowledge of the optical properties is desirable. Here, thermally grown thin films of different meso-tetraphenyl porphyrins (i.e. H2TPP, NiTPP, and CoTPP) on silicon are assessed by spectroscopic ellipsometry and atomic force microscopy. Optical constants were determined in the near-IR to near-UV spectral range. A detailed discussion of the optical bands and the related electronic transitions is performed.