無機鈣鈦礦材料具有優異的光學特性和熱穩定性相較於有機鈣鈦礦材料，因此已廣泛應用在光學元件當中，其中製備成鈣鈦礦薄膜的方式大多以溶液製程為主，有化學溶劑汙染環境的困境，而採用熱蒸鍍沉積法為解決的方法之一。因此本論文以單源熱蒸鍍的方式進行無機鈣鈦礦薄膜的製備，與傳統的雙源共蒸鍍法相比，製程無需準確控制蒸鍍原料之鍍率和熱處理等優勢。並且使用由實驗室以水系統合成的CsPbBr3粉末作為蒸鍍原料，可提升熱蒸鍍製程中鈣鈦礦薄膜的品質。 為了證明蒸鍍單一相CsPbBr3粉末的優勢，將混和CsBr和PbBr2粉末至坩堝中進行比較。除此之外，我們也探討CsPbBr3粉末在不同蒸鍍溫度所沉積的鈣鈦礦薄膜組成分，發現隨著蒸鍍溫度與預鍍時間的變化，會影響鈣鈦礦薄膜中Pb原子的比例，進而衍生出CsPb2Br5晶體或Cs4PbBr6晶體，因此我們透過調整蒸鍍溫度與延遲預鍍時間的方式，改善蒸鍍過程中鈣鈦礦薄膜的原子比例，並且可製備CsPb2Br5、CsPb2Br5-CsPbBr3、CsPbBr3、CsPbBr3-Cs4PbBr6的鈣鈦礦薄膜。由XRD、SEM、TEM、XPS分析不同蒸鍍參數的晶格結構、表面形貌與化學組成分，同時使用UV-Vis、PL、UPS分析不同鈣鈦礦薄膜之光學特性，其中製備的CsPbBr3薄膜能帶結構位置為CBM : -3.43 eV與VBM : -5.76 eV，此研究有助於在光電元件之能階匹配。 本研究成功的以實驗室自行合成的CsPbBr3粉末進行單源熱蒸鍍的製程，製備具有連續性、緻密、無孔洞的高品質無機鈣鈦礦薄膜，未來將採用此技術應用於太陽能電池與發光二極體中，期望元件具有優異的轉換效率。;In this study, we prepared the perovskite film by single-source vacuum deposition. Compared with the conventional dual-source co-evaporation method, single-source vacuum deposition will be fast and simple; and the CsPbBr3 powder synthesized by the water-based system. To improve the quality of the perovskite film during the thermal evaporation process. We were mixed CsBr and PbBr2 powder into the crucible to compare CsPbBr3 powder have high purity thin film by single-source vacuum deposition. Therefore, we discuss the perovskite film at different evaporation temperatures. The different of temperature and pre-evaporation process will affect the content of Pb in the thin film, and then derivative the Cs4PbBr6 or CsPb2Br5 phase. We used the XRD, SEM and TEM to analyze perovskite thin film of different evaporation parameters. We adjusted the temperature and pre-evaporation process to improve the ratio of Cs and Pb during the evaporation process. Moreover, Single- source vacuum deposition without a post-heat-treating process was used to prepare high-quality CsPbBr3 thin films. And we also analyze the perovskite film of different crystal phases, where CsPbBr3 thin film has emission wavelength at 525 nm and FWHM less than 18.5 nm. According to UPS analysis, the valence band maximum (VBM) and the conduction band minimum (CBM) were calculated to be -5.76 eV and -3.43 eV. Finally we fabricated high-quality CsPbBr3 thin films and applied to photovoltaic light-emitting diode by single-source vacuum deposition.
