開發雙層結構於穩定高效能錫鈣鈦礦太陽能電池之應用

Development of Bilayer Structures for Highly Efficient and Stable Tin-based Perovskite Solar Cells

鄭博元(Po-Yuan Cheng)

指導教授 ： 刁維光

國立交通大學/理學院/應用化學系所/碩士(2020年)

摘要

本篇論文主要以無鉛錫鈣鈦礦為主，透過使用六氟異丙醇(1,1,1,3,3,3-Hexafluoro-2-propanol,HFP)來取代異丙醇，並使用順序沉積八種不同的胺陽離子在3D E1G20鈣鈦礦層上，形成2D/3D或是quasi-2D/3D結構作為光吸收層，並使用GIWAXS、SEM、PL、XRD、C-AFM 及TAS證明其雙層結構的存在。在使用苯胺陽離子後，能大幅使轉換效率從最高效率8.7 %提高至10.4 %，並在元件未封裝的情況下，在空氣環境中保持優異的穩定性。我們也首次在錫鈣鈦礦太陽能電池上進行熱穩定的測試，在持續光照並加熱再冷卻元件後，我們觀察到苯胺雙層結構有所謂的自癒現象發生，並表現出遠優於E1G20的熱穩定性。

關鍵字

鈣鈦礦 ； 雙層結構 ； 錫 ； 太陽能電池

並列摘要

To solve the toxic issue for new-generation solar cells, tin-based perovskite solar cells are promising alternative to their lead counterparts but they suffered from poor stability due to their tempting tin oxidation. Herein we report a new sequential deposition approach using the solvent, hexylfluoro-2-propanol (HFP), to deposit eight bulky ammonium cations on top of the 3D layer to form a 2D/quasi-2D layer to protect the tin perovskite grains from moisture penetration. The formation of the 2D layer was confirmed by GIWAXS, SEM, PL,XRD and TAS studies. We found that the alilinium (AN) device showed remarkable performance for the efficiency over 10 % with great stability in ambient air without encapsulation. The AN device also showed a self-healing effect on performance when it was imposed to severe environment under continuous light-soaking in one-sun illumination and thermal stress between 20 and 50 C for 10 cycles.

並列關鍵字

perovskite ； bilayer ； tin-based ； solar cells

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