一步沉積法(One-step deposition method，一步法)以及二步沉積法(Two-step deposition method，二步法)是薄膜製備常見的方法，形成鈣鈦礦的機制不同，也各有優劣。因此在本研究主要分為兩部分，第一部分為製程參數的調控，以雙元陽離子鈣鈦礦FAMAPbI3做為吸收層材料並分別以一步法及二步法沉積鈣鈦礦薄膜製備太陽能電池。由於雙元陽離子鈣鈦礦為本實驗室首次開發，因此需進行實驗參數的調控、製程的優化以得到高效率且高穩定性的元件，結果顯示，由於兩種沉積方法結晶鈣鈦礦的工作原理不同，因此實驗最佳條件幾乎完全相異，使用二步法進行沉積使元件可獲得較高的光電轉換效率。
第二部分則進一步深入探討不同沉積方法之間的鈣鈦礦薄膜性質及元件光伏表現，透過種種分析結果證明利用二步法進行沉積其薄膜性質以及光伏表現均有大幅提升，鈣鈦礦太陽能電池的最佳光電轉換效率可以在一太陽光照射下從一步法之18.90 %提高到二步法之21.34 %，穩定性也隨之提高，顯示了以不同沉積方法製備的雙元陽離子鈣鈦礦太陽能電池在薄膜性質以及光伏表現上均有明顯的差異。

The “One-step deposition method”(One-step method) and the “Two-step deposition method”(Two-step method) are common techniques for thin film fabrication, each with distinct mechanisms for forming perovskites and their own advantages and disadvantages. This study is thus divided into two main parts. The first part focuses on adjusting the processing parameters. Using a binary cation perovskite, FAMAPbI3, as the absorbing layer material, we fabricated solar cells using both the one-step and two-step deposition methods. Since this binary cation perovskite is being developed for the first time in our laboratory, experimental parameter adjustments and process optimizations are necessary to achieve high-efficiency and high-stability devices. The results show that, due to the different principles of perovskite crystallization in the two deposition methods, the optimal experimental conditions are almost entirely different. The two-step method results in devices with higher photoelectric conversion efficiency.
The second part of the study delves further into the properties of perovskite thin films and the photovoltaic performance of devices fabricated using different deposition methods. Various analyses demonstrate that the two-step deposition method significantly enhances both the film properties and photovoltaic performance. The optimal photoelectric conversion efficiency of perovskite solar cells can be increased from 18.90 % with the one-step method to 21.34 % with the two-step method under one-sun illumination. Stability is also improved, indicating that binary cation perovskite solar cells fabricated using different deposition methods exhibit significant differences in thin film properties and photovoltaic performance.

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