本論文的研究主要分為兩部分，分別使用硼氫化合物溶液來修飾高功函數金屬電極和二氧化鈦表面以取代傳統元件。第一部分利用硼氫化合物溶液於高分子吸光層和高功函數金屬間進行修飾，並應用於高分子異質接面太陽能電池（polymer bulk hetero-junction solar cells，OPVs）；第二部分利用硼氫鹽化合物溶液修飾二氧化鈦電極表面並應用於倒置式高分子異質接面太陽能電池（Inverted-OPVs，IOPVs），兩部分內容分別詳述如下：
在第一部分中，我們將硼氫化鉀應用於高分子異質接面太陽能電池（OPVs）中作為電子收集層，經過修飾後元件光電轉換效率可達3.3~3.5%，已可媲美傳統元件效率（~3.5%），推測原因為硼氫化鉀分別與有機層和金屬電極進行化學反應降低載子萃取和注入的能量障礙而有利於載子的傳輸，藉由X射線光電子圖譜、單一載子注入量測、全反射紅外光光譜儀和交流阻抗分析圖譜等可以得到證實。
第二部分的研究中，我們將硼氫化鈉修飾二氧化鈦電極應用於倒置式高分子異質接面太陽能電池（IOPVs），經由改變不同電極表面性質來影響高分子薄膜吸光層的結構和型態使得元件效率可達3.64%，藉由低掠角X射線繞射法、可見光-紫外光吸收光譜圖、單色光光電轉換效率圖譜和交流阻抗圖譜等得到證實。

In this thesis we can enhance the PCE of polymer solar cell through simple solution-proceed a new material KBH4、NaBH4 as efficient electron extraction layer in the regular and inverted-type device in polymer bulk hetero-junction solar cell, and the detail as below：
For the first part, from the current-voltage (J-V) measurements under AM1.5G illumination conditions at an intensity of 100 mW/cm2, we find that the significant increasing in Voc from 0.42V to 0.56V, and FF from 0.45% up to 0.61%, resulting for the maximum power conversion efficiency (PCE) from 1.8% to 3.5% with vacuum-evaporation Al、Ag、Au、Cu as negative electrode. We also performed the electron-only device to analyze the electron injection barrier of negative electrode, and further using x-ray photoemission spectroscopy (XPS)、Attenuation total reflection Infrared spectroscopy（ATR-IR）to confirmed the mechanism of the interlayer on solar cell device.
For the second part, we study an novel salts NaBH4, to deposit on TiO2 surface by solution fabrication process to improve the efficiency for the TiO2-based I-OPVs. From device current density-voltage (J-V) characteristics it found that the overall power conversion efficiency was increased from 2.80% to 3.64% when NaBH4 was inserted between TiO2 and active layer. This value is as high as the PCE for Ca/Al-based regular device (3.5%). The significant improve for PCE mainly resulting from the increase of short-circuit current from 9.92 to 12.62 (mA/cm2). We assume that the improvement of Jsc is due to the morphology of the active layer. In order to determine the morphology of P3HT:PCBM on the different substrates, IPCE、 Grazing-incidence X-ray diffraction (GI-XRD)、UV-Vis measurements were performed；From these results, the crystalline structures of P3HT:PCBM film on TiO2 and TiO2/ NaBH4 were different. Therefore, we can adjust the morphology of P3HT:PCBM on different substrates to achieve high efficiency I-OPVs.
The significant enhancement in Voc、FF、Jsc, and the simplicity of incorporating an interlayer by solution processing rather by thermal evaporation make materials as KBH4、NaBH4 a good candidate for further enhancing the performance of polymer solar cells (PSCs).

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