Photosensitization and photocurrent switching effects in wide band gap semiconductors: CuI and TiO2 functionalized with iron and nickel complexes: from semiconductors to logic devices

  • Szymon Wojtyła
  • Tomasz BaranEmail author


Materials obtained by immobilization of nickel and iron complexes on the surface of n-type titanium dioxide and p-type copper iodide have interesting photoelectrochemical properties. Fe(NA)Cl2@TiO2, Fe(NA)Cl2@CuI, Ni-rutin@CuI and Ni-rutin@TiO2 exhibit pronounced photosensitization towards visible light and photoelectrodes prepared from these materials generate photocurrents over a broad light wavelength window. The polarity of the generated photocurrents varies with change of the applied potential. Photocurrent switching phenomena can be described in terms of photoinduced charges transfer involving semiconductor and excited metal complex. Various types of interaction between semiconductor and adsorbed complex reflected in different mechanism of photosensitization. The studied materials has been characterized using various spectroscopic, crystallographic and electrochemical methods. Based on the photochemical measurements and diffuse reflectance spectroscopy the mechanism of photosensitization as well as mechanism of photocurrent generation in various conditions have been suggested. Due to interesting photoelectrochemical properties, studied materials are promising for optoelectronic logic devices such as demultiplexer. Studied materials are particularly attractive due to high stability and photostability.


Semiconducting materials Optoelectronics Titanium dioxide Copper iodide Metal complex photosensitizers 



Authors are grateful to SajTom Light Future for financial support. We thank Overlack Sp. z o.o. for TiO2 sample.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10904_2016_484_MOESM1_ESM.docx (1.2 mb)
Supplementary material 1 (DOCX 1181 KB)


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.SajTom Light Future LTDCzaniecPoland
  2. 2.Department of ChemistryUniversity of MilanMilanItaly

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