本研究的主要目的是開發一個串級結構，以應用於室內光照射下的染料敏化太陽能電池。此結構是堆疊兩個獨立的電池（稱為頂部電池和底部電池）而形成具「上下層電池」之串級結構。在此一結構中，未被頂部電池吸收的入射光可以再次被下方的底部電池吸收和利用，提高電池的吸光能力。因為串聯電池的光吸收是由頂部和底部電池共同分擔，所以可用兩個較薄的光電極來替代一個較厚的電極，藉此來降低電荷在TiO2薄膜中的傳輸阻力。因此，串級結構不只可以增加光的捕獲能力，亦可降低電荷轉移能力，提升電池的效率。研究中，我們利用Pt做為對電極，Y123作為敏化劑，首先探討不同厚度的頂部電池和底部電池對整個電池效率的影響，再利用紫外光-可見光光譜儀(UV-Vis)來分析入射光在上下兩電池的吸收性及穿透性。實驗結果顯示，此一串級電池在2000 lux的光強下可以得到34%的光電轉換效率。若將對電極為PEDOT及共敏染料，則效率可再提升至36.3%。此一電池在25℃存放1200小時的測試之後，仍有極佳的光電轉換表現。除了室內光的探討外，本研究亦將此串級結構電池應用於太陽光照射環境。與獨立電池相比，此一串級電池可以將光電轉換效率由9.27%提升至11.31%。

The main purpose of this study is to develop a tandem structure for application in dye-sensitized solar cells under indoor light illumination. This structure is to stack two separate cells (called the top cell and the bottom cell) to form a tandem structure with "upper and lower cells".
In this structure, the incident light that is not absorbed by the top cell can be absorbed and utilized by the bottom cell below again, thereby improving the light absorption capability of the cell. Since the light absorption of the tandem cells is shared by the top and bottom cells, two thinner photoelectrodes can be used to replace one thicker electrode, thereby reducing the charge transport resistance in the TiO2 film. Therefore, the tandem structure can not only increase the light trapping ability, but also reduce the charge transfer ability and improve the efficiency of the cell. In the study, we used Platinum as the counter electrode and Y123 as the sensitizer. First, we explored the effect of different thicknesses of the top cell and bottom cell on the overall cell efficiency, and then used a UV-Vis spectrometer (UV-Vis) to analyze the incident light. The absorbency and penetration of the upper and lower batteries. The experimental results show that the tandem cell can achieve a photoelectric conversion efficiency of 34% under the light intensity of 2000 lux.
If the counter electrode is replaced by PEDOT and co-sensitizer, the efficiency can be further increased to 36.3%. This cell still has excellent photoelectric conversion performance after being stored at 25℃ for 1200 hours.
In addition to the discussion of indoor light, this study also applies the tandem structure cell to the sunlight irradiation environment. Compared with the stand-alone cell, this cascade of cells can increase the photoelectric conversion efficiency from 9.27% to 11.31%.

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