近來石油及各生質能源短缺情形日漸嚴重，太陽能電池亦因此而更受重視、投資發展。無機矽太陽能電池自始至終皆有成本過高之致命傷，有別於此，有機太陽能電池以成本低廉、製程簡易快速且可以軟性物質為基板等特性，未來之發展備受矚目。
我們嘗試了三種結構來製作串疊太陽能電池。其一，將共軛高分子與有機小分子以Au作串疊，主動層材料分別為P3HT、PCBM與CuPc、C60，利用兩者光吸收波長範圍互補之特性，增加元件對光之吸收效率，其中高分子元件採溶液製程，以旋轉塗佈之方式成膜，而小分子元件則使用蒸鍍製程，以真空熱蒸鍍之方式成膜。其二，將兩共軛高分子串疊，同樣以Au作連接，藉由調變P3HT與PCBM之混合比例，讓兩個子元件之光吸收波長範圍不同，目的為製作VOC大JSC小之元件，將來可應用於大面積元件製作，減少電流經ITO路徑之能量損耗。其三，將正反相元件直接黏合。
本論文主要在研究有機串疊太陽能電池之製程方法，如何正確地定義層與層間之面積，以及如何真實地量測串疊元件與其子元件之效應。

Recently, the shortage of gasoline is getting serious. As a result, people pay much more attention to solar cells. Unfortunately, high cost is always a main problem for inorganic silicon solar cells to apply commercially. With characteristics of simple and cost-effective fabrication process, moreover, flexible materials being the substrate, organic solar cells play an more and more important role in the future.
We try to fabricate three kinds of tandem cells. The first cell is a bulk heterojunction consisting blending of P3HT and PCBM combined with blending of CuPc and C60 by gold as an interlayer. The efficiency of spectrum absorption will be enhanced by means of matching two active layers with complementary spectrum range. The blending of P3HT and PCBM was spin-coated on ITO-coated glass and small molecules was coated by evaporation. The second cell is combination of two conjugated polymers with the same interlayer and it is all-solution process. We adjust concentration ratio between P3HT and PCBM of two unit cells to make them absorb different spectrum range. The third one is formed by one normal-cell sticking to one inverted-cell.
The main work we studied is the method how to fabricate tandem cells and how to accurately define areas overlapped by every layer. Finally, we also studied how to reasonably and correctly measure tandem cells and the effect of two unit cells.

[1] K. M. Coakley, and M. D. McGehee, “Conjugated polymer photovoltaic cells,”
Chem. Mater. 16, 4533, 2004
[2] H. Hoppe, and N. S. Sariciftci, “Organic solar cells: An overview,” J. Mater.
Res., Vol. 19, No. 7, Jul 2004
[3] C. W. Tang, “Two-layer organic photovoltaic cell,” Appl. Phys. Lett. 48, 183,
1986
[4] N. S. Sariciftci, L. Smilowitz, A. J. Heeger, and F. Wudl, Science 258, 1474,
1992
[5] G. Yu, K. Pakbaz, and A. J. Heeger, “Semiconducting polymer diodes: Large
size, low cost photodetectors with excellent visible-ultraviolet sensitivity,”
Appl. Phys. Lett. 64, 3422, 1994
[6] P. Sullivan, S. Heutz, S. M. Schultes, and T. S. Jones, Appl. Phys. Lett., Vol.
84, No. 7, February 2004
[7] S. Uchida, J. Xue, B. P. Rand, and S. R. Forrest, Appl. Phys. Lett., Vol. 84, No.
21, May 2004
[8] A. Yakimov and S. R. Forrest, Appl. Phys. Lett., Vol. 80, No. 9, March 2002
[9] J. Xue, S. Uchida, B. P. Rand, and S. R. Forrest, Appl. Phys. Lett., Vol. 85, No.
23, December 2004
[10] G. Dennler, H.-J. Prall, R. Koeppe, M. Egginger, R. Autengruber, and N. S.
Sariciftci, Appl. Phys. Lett. 89, 073502, 2006
[11] A. Colsmann, J. Junge, C. Kayser, and U. Lemmer, Appl. Phys. Lett. 89,
203506, 2006
[12] A. G. F. Janssen, T. Riedl, S. Hamwi, H.-H. Johannes, and W. Kowalsky,
Appl. Phys. Lett. 91, 073519, 2007

[13] G. Li, V. Shrotriya, J. Huang, Y. Yao, T. Moriarty, K. Emery, and Y. Yang, Nat.
Mater. 4, 864, 2005
[14] K. Kim, J. Liu, M. A. G. Namboothiry, and D. L. Carroll, “Role of donor and
acceptor nanodomains in 6% efficient thermally annealed polymer
photovoltaic,” Appl. Phys. Lett. 90, 163511 (2007).
[15] 陳金鑫, 黃孝文, “OLED－有機電激發光材料與元件,” 五南, 2005
[16] 林豫立, “碩士論文－有機共軛高分子太陽電池之製程研究,” 國立清華大
學光電工程研究所, June 2007
[17] 李智聖, “碩士論文－高效率且半透光之有機反相太陽能電池製程研究,”
國立清華大學光電工程研究所, June 2008