Influence of physical and chemical post treatment with TiO2 Electrode for Dye-Sensitized Solar Cells

Dae-Kue Hwang^a, Shi-Joon Sung^a, Dae-Hwan Kim^a, Kang-Pil Kim^a, Jeong-Hwa Kim^a

^aDaegu Gyeongbuk Institute of Science & Technology, 50-1 Sang-Ri, Hyeonpung-Myeon, Dalseong-Gun, Daegu, 711, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Dae-Kue Hwang, 332
Publication date: 5th February 2015

The dye-sensitized solar cell (DSSC), based on a wide-band-gap semiconductor and a suitable dye, is a promising device for a low cost, efficient conversion of solar energy. The key component of the DSSC is its wide-band-gap semiconductor (TiO₂), with a large surface area for dye adsorption. There are many reports of the fabrication of TiO₂ films by various techniques. The doctor-blade method, the screen printing, electrospinning and electrospray methods are used techniques to prepare TiO₂ films for DSSC. Among the techniques, the electrospray method has advantages in that it utilizes purely electric field to form the aggregate structure, allowing independent control of the aggregation, size and crystallinity of the primary nanoparticles. Moreover, it offers inherent flexibility in controlling the size and size distribution of the aggregates by simply adjusting electrospray parameters, including the flow rate and the applied voltage. In addition, electrospraying allows one to tune the packing density or porosity of the aggregates by selecting the appropriate type of polymer additive. However, electrosprayed TiO₂ electrodes have many pores and disconnected electron pathways, both of which are major factors limiting the power conversion efficiency (PCE) of the device. One promising approach to enhance the electron transport is a physical or chemical technique as a form of hot-pressing followed by a titanium tetrachloride (TiCl₄) treatment process. In this study, we investigated the characteristics of DSSCs with an electrosprayed TiO₂ electrode after a post-treatment process, specifically a hot-pressing and TiCl₄ treatment method.

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