利用微波輔助合成法於溶熱系統中乾淨且省時的合成純銳鈦礦二氧化鈦奈米結晶於染敏太陽能電池的應用

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Research Express@NCKU - Articles Digest

Research Express@NCKU Volume 27 Issue 9 - November 7, 2014 [ http://research.ncku.edu.tw/re/articles/e/20141107/2.html ]

Clean and time-effective synthesis of anatase TiO

₂

nanocrystalline by microwave-assisted solvothermal method for dye-sensitized solar cells

Po-Shen Shen^a, Yu-Chuen Tai^b, Chao-Yu Chen^a,c,d,*, Yu-Chun Wu^b

a Department of Photonics, National Cheng Kung University

b Department of Resources Engineering, National Cheng Kung University

c Advanced Optoelectronic Technology Center, National Cheng Kung University

d Center for Energy Technology and Strategy, National Cheng Kung University [email protected]

Journal of Power Sources, Vol. 247, 444-451 (2014)

I

n this study, we employed microwave-assisted heating method to synthesize pure anatase TiO₂nanoparticles by solvothermal route. The synthesized TiO₂ nanoparticles of 20 nm are suitable as metal oxide semiconductor material for the application of dye-sensitized solar cells.

The major advantage of this recipe is the time-saving procedure for screen-printing paste

preparation, which prevents solvent exchange process. For the concern of industrial mass production, it would be beneficial to greatly reduce the cost for producing titanium dioxide.

Moreover, the dye-sensitized solar cells using microwave-synthesized TiO₂ nanoparticles delivered power conversion efficiency as high as 7.8%, which is the best device efficiency to date in the solvothermal system.

Figure 1 shows the XRD patterns of the microwave-synthesized TiO₂ dry powders and the results indicate pure anatase TiO₂ phase.

Figure 2a presents the scanning electron microscopy image of the synthesized TiO₂ dry powders where we observed uniform TiO₂ nanoparticles. In Figure 2b, the transmission electron microscopy image demonstrates TiO₂ nanoparticle size of 30 nm in length and 20 nm in width.

Figure 3a displays current-voltage characteristics of devices using microwave-synthesized TiO₂ nanoparticles and Figure 3b shows the incident photon to electron conversion efficiency (IPCE) curves of devices.

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Figure 1. XRD patterns of the microwave-assisted solvothermal synthesized TiO₂ dry powders.

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Figure 2. (a) SEM, (b) TEM and (c) HRTEM images of the microwave-assisted solvothermal synthesized TiO₂ dry powders.

Figure 3. Photovoltaic characteristics of dye-sensitized solar cells using microwave-synthesized nanoparticles : (a) current-voltage curves and (b) IPCE curves.

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