本論文以三碘化甲胺鉛(CH3NH3PbI3)作為鈣鈦礦材料，主要探討在三鹵化甲胺鉛中添加微量的乙胺碘(ethylammonium iodide)，製作出平面異質接面的鈣鈦礦太陽能電池，其光電轉換效率由10.03% 提升至10.61%。為了瞭解乙胺碘對於鈣鈦礦主動層的影響，本研究利用X光繞射、高解析掃描式電子顯微鏡、光吸收頻譜、外部量子效率、載子傳輸能力等材料分析，更進一步探討乙胺碘在鈣鈦礦主動層的變化。經由實驗結果發現，添加適量的乙胺碘可以提升鈣鈦礦的結晶度，使鈣鈦礦晶格形成一混相的狀態，同時晶形大小變大，孔洞變少，改善了鈣鈦礦太陽能電池的開路電壓及填充因子，提升鈣鈦礦太陽能電池的光電轉換效率。然而，我們亦將適量乙胺碘添加於甲脒碘(CH3(NH2)2PbI3)中，其光電轉換效率由9.26% 大幅提升至11.48%。從本研究的結果顯示，乙胺碘對於鈣鈦礦主動層之改善確實有著關鍵性的作用。

In this research, we utilized the methylammonium lead iodide (CH3NH3PbI3) as the material of the perovskite with a small addition of ethylammonium iodide (CH3CH2NH3I) to produce planar heterojunction perovskite solar cells. The power conversion efficiency of MAPbI3 device with the volume ratio of 2.5% of ethylammonium iodide has increased from 10.03% up to 10.61%. We have observed that the perovskite had higher crystallinity with larger grain sizes and less pin-holes in a hybrid phase of the structure, improving the open-circuit voltage, the fill factor and the power conversion efficiency. In addition, we have demonstrated the same method on the formamidinium iodide (CH3(NH2)2PbI3) perovskite solar cell with much improvement of power conversion efficiency from 9.26% up to 11.48%. Overall, further discussions have been investigated on the understanding of the additives of ethylammonium iodide.

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