Group of optical spectroscopy of thin layers

Mgr. Zdeněk Remeš, Ph.D.

Employee function
Head of Working Group
Telephone
+420 220 318 540, +420 220 318 496, +420 220 318 486
E-mail
remes [at] fzu.cz
Locality
Cukrovarnická
Room
D 303
D 301
A 16
Text

The group is focused on the investigation of thin-film materials for photovoltaic cells by measuring the absorption edge by photothermal deflection spectroscopy (PDS), photocurrent and luminescence measurements. Especially photo current measurement has a strong tradition thanks to the FTPS (Fourier-Transform Photocurrent Spectroscopy) method developed in this group. The information obtained is the steepness of the absorbing edge (see Fig. A) and the absorption in the band gap (see Fig. B), which gives information about the semiconductor disorder and the concentration of deep traps. Currently, hybrid organic-inorganic perovskites CH3NH3PbI3, ZnO or diamond have become of interest. The group also deals with the preparation of these nanostructures and patented a solar cell with a nanostructured ZnO electrode (see Fig. C).

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Description

A) Historically the first measurement of CH3NH3PbI3 absorption edge steepness, B) defects in CH3NH3PbI3 due to illumination observed by FTPS below absorption edge and effect on efficiency, C) ZnO nanocolumns grown by hydrothermal growth.

Research activities: