鈣鈦礦太陽能電池的光電轉換效率發展迅速，使再生能源的研究展露出一道曙光。尤其因應全球暖化的影響，無鉛鈣鈦礦的成長更是備受矚目，因此為了達到商業化生產，除了優異的光電轉換效率之外，還需考慮電池的長時間工作穩定性，因此本篇論文的研究動機為提升鈣鈦礦太陽能電池的穩定性。
本篇論文的研究主要探討摻雜不同比例的有機材料HAI (n-Hexylammonium iodide)對於其合成的鈣鈦礦太陽能電池元件長時間穩定性的影響。鈣鈦礦吸光層的製備是藉由溶液工程(solution engineering)將FAI (Formamidinium iodide)、HAI、SnI2、SnF2混合旋塗，再使用反溶劑(Chlorobenzene)沖刷基板，形成緻密薄膜，調變滴定時間、退火溫度以及旋轉速度得到優化後的鈣鈦礦薄膜。添加微量的 EDAI2和摻雜HAI 則有助於晶體的成核以及成長，減少缺陷以及漏電流的產生。利用吸收圖譜(UV-vis)、受激螢光放光(Photoluminescence)以及 GIWAXS (Grazing-Incidence Wide-Angle X-ray Scattering)等光學儀器分析摻雜HAI 後形成的鈣鈦礦薄膜對元件結構以及光學性質的變化。

The emerging lead-Free perovskite has attracted enormous attention due to its eco-friendly nature. Among the lead-free perovskites, tin-based perovskite has lots of excellent optoelectronic properties, such as appropriate band gap of 1.41 eV, high absorption coefficient (105 cm-1), long carrier length (500 nm) and so on. However, the easy oxidation of Sn2+ to Sn4+ in tin-based perovskite will create vancancy which alter the electronic properties of tin-based perovskite. As a result, the oxidation reaction is a key issue for stabilizing the tin-based perovskite and the device performance. In this study, we codope HAI and EDAI2 in FASnI3 perovskite to stabilize the perovskite film as well as device stability. The device performance is optimized at a precursor ration HAI:FAI=3:97 with a doping level of 10% EDAI2 to attain a power conversion efficiency (PCE) of 5.17%. The device works stably on different temperature at 80C, 100C, and 120C for 12hr in a globe box. Additionally, the device without encapsulation displayed can survive for 9 hr in air. Doping cation in tin-based perovskite paves the way for stable tin-based perovskite solar cells. The new material is doped in lead-free perovskite to help promotion of the efficiency and stability.

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