Effect of the Size of Bi 2 Te 3 nanoplates on the Performance of TiO 2 -based Novel Hybrid DSSC Combined PV and TE Effec
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Effect of the Size of Bi2Te3 nanoplates on the Performance of TiO2-based Novel Hybrid DSSC Combined PV and TE Effect Li Hu 1,2, Liang Fang1, 3, , Fang Wu1, JinMei Wang1 1 Deartment of Applied Physics, Chongqing University, Chongqing, 401331, P.R.China. 2 School of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing, 400067,P.R.China. 3 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720,United States. ABSTRACT In order to make use of the waste heat caused by the unabsorbed light based on photovoltaic(PV) effect, a novel hybrid dye-sensitized solar cells (DSSC) with the synergies of PV and thermoelectric(TE) effect has been proposed in present work. The main idea is to prepare a composite hybrid DSSC photoanode which can simultaneously achieve PV and TE conversion by incorporating the excellent TE Bi-Te alloys into TiO2 nanomaterial. In this paper, Bi2Te3 nanoplates with different size were doped in theTiO2 nanoparticle photoanode and the effect of the Bi2Te3 size on the properties of DSSCs was analyzed. It is found that with the decrease of the size of the Bi2Te3 nanoplates, the TE performance became better and the dye absorption and the conversion efficiency of DSSCs were improved. Preliminary results show that the efficiency of DSSC with Bi2Te3 increased at least 15.3% compared to the undoped. By further optimizing the parameters, the performance of DSSC is estimated to have a much more enhancement. Therefore, the way of combination PV and TE provides an alternative way to improve the performance of DSSC. INTRODUCTION Since 1991,the team of M.Gratzel made breakthrough in the Dye-sensitized solar cells(DSSCs)[1]，DSSCs have attracted extensive attention for their lower cost,simple fabrication methods and high power conversion efficiencies. The total photoelectric conversion efficiency has already enhanced to 15% [2] from its original 7.1%[1]. A typical DSSCs consists of a photoanode, a cathode, and an electrolyte solution containing a redox couple. The photoanode is almost always a porous nanocrystalline TiO2 layer where dye absorption and electron transfer happened, which has significant influence on cell performance of DSSCs. So a lot of researches have been made to optimize the performance of the photoanode[3-9]. The common methods are to fabricate light-scattering layer film or to use TiO2 hollow spheres3, while some cells utilize the doped TiO2 film[10]. However, most of these researches have focused on one type energy conversion of light to electricity. In solar cell operation, heat is mild and often produced from IR irradiation. Recently, the thermoelectric(TE) materials have been doped in the TiO2 film to Author to whom correspondence should be addressed.
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optimize the performance of DSSCs. The experiment show that mixing the TE materials can increase both the conversion efficiency and the stability of the DSSCs [11]. In present work, the excellent TE Bi2T
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