The application of photovoltaic conversion devices due to interfacial charge-transfer transitions based on Nb doped TiO2 electrode
Reo Eguchi a, Morio Nagata a
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Reo Eguchi, 019
Publication date: 7th November 2016

Upon the formation of the surface complexes of organic molecules (TCNQ, 2-anthroic acid) with TiO2 nanoparticles, new visible light absorption bands appear due to interfacial charge-transfer (ICT) transitions from these organic molecule's adsorbates to the conduction band of TiO2 directly. Therefore, ICT transitions are expected to be a novel charge-separation mechanism for efficient photovoltaic conversion featuring one-step charge separation with energy loss [1]. In this study, the complexes of each organic molecules TCNQ and 2-anthroic acid with Nb doped TiO2 electrode were fabricated such as dye-sensitized solar cells (DSSCs) and investigated the improvement of charge-transfer process of them. The Nb doped TiO2 nanoparticles were prepared by hydrothermal method at 180 ºC for 24 h [2]. According to dope Nb into TiO2 lattice, its level of the conduction band could be closer to these organic molecule's adsorbates than its of Un doped TiO[3]. That is, the injection of ICT transitions could be shortly. This presentation will mainly discuss the surface of the Nb doped TiO2 nanoparticles chemically absorbed with these organic molecules by using incident photon-to-current conversion efficiencies (IPCE) and I-V measurement. Furthermore, the present description will also focus on the effect of carrier recombination due to ICT transitions with the Nb doped TiO2

Reference;

[1] J.Fujisawa phys.Chem.Chem.Phys.,2015,17,12228-12237

[2] T.Nikolay,L.Larina,O.Shevaleevskiy,B.T.Ahn Energy Environ. Sci.,2011,4,1480-1486

[3] J.Liu, Y.Duan, X.Zhou, Y.Lin Appl.Surf.Sci.,2013,277,231-236



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