近年來鈣鈦礦太陽能電池的研究一直不斷的進展，其優異的光伏性能，被視為具有發展潛力的新世代太陽能電池之一。然而，在鈣鈦礦太陽能電池的製程中，由於鈣鈦礦本身對於水氣及氧氣高度敏感，容易導致其結構缺陷的生成，影響其元件效能及穩定性。因此，典型鈣鈦礦太陽能電池的製程都是以有機溶劑作為前驅液。儘管有機溶劑有助於太陽能元件製程的發展，但對環境及生態的發展仍然相對不友善。因此如何建置環境友善的鈣鈦礦元件製程並維持其高效的元件性能，是現今各界高度關注的研究課題。
在此次研究中，我們提出一水溶性共軛高分子誘導在鈣鈦礦介質中形成異質接面的策略，藉以增強其鈣鈦礦對水氣及氧氣的容忍性、結晶特性及光學效能。由於水溶性共軛高分子與鈣鈦礦之間存在異質接面，能夠有效鈍化鈣鈦礦於結晶時所產生的缺陷，從而改變鈣鈦礦的結晶特性，使其晶粒更加均勻及緻密。此外，也因為共軛高分子的能帶特性能有助於調控鈣鈦礦主動層之能階，促進能量的傳遞，增進其元件內部載子的傳載，最終達到18.8 %光電轉換效率。總體來說，此新興開發的系統不僅展現出特異的互補特性，未來也極具潛力應用於鈣鈦礦太陽能電池的發展。

In recent years, research on perovskite solar cells has been continuously advancing, and its excellent photovoltaic performance has positioned them as one of the promising next-generation solar cell technologies. However, the processing of perovskite solar cells involves the use of organic solvents as a precursor solution, as perovskite itself is highly sensitive to moisture and oxygen, making it prone to the formation of structural defects that can affect device efficiency and stability. Although organic solvents have facilitated the development of the solar cell fabrication processes, they are relatively environmentally unfriendly. Therefore, creating an environmentally friendly fabrication process for perovskite devices while maintaining their high efficiency has become a highly focused research topic from both academia and industry.
In this thesis, we propose a strategy to utilize the water-soluble conjugated polymers to induce the formation of heterojunction interfaces in perovskite matrix, in order to enhance the tolerance of perovskite to moisture and oxygen, as well as its crystalline characteristics and optical performance. The presence of a heterojunction interface between the water-soluble conjugated polymer and perovskite effectively passivates the defects generated during perovskite crystallization, leading to improved crystalline properties with more uniform and compact grains. In addition, the energy band characteristics of the conjugated polymers contribute to the control of the energy levels within the perovskite active layer, thus facilitating energy transfer and enhancing the transport of carriers within the device, eventually resulting in an impressive photoelectric conversion efficiency of 18.8 %. Overall, this newly developed system not only exhibits unique complementary properties, but also holds great potential for future applications in perovskite solar cells.

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