摻雜銀離子於主動層之鈣鈦礦太陽能電池研究

The study of perovskite solar cells with a silver iodide-doped active layer

黃馨葒

none ； none

義守大學電子工程學系學位論文

2018年

碩士

蘇水祥

繁體中文

本論文旨在以連續溶液法製作鈣鈦礦太陽能電池並探討其光電特性，分別於鈣鈦礦前驅材料碘化鉛(PbI2)及甲基碘化胺(MAI)中以氯化銀(AgCl)摻雜以及二甲基甲醯胺(DMF)添加劑方式置入。不參與鈣鈦礦結晶反應的銀離子及DMF分子占據鈣鈦礦框架中，利用分子交換方式延長鈣鈦礦反應進行時間，減緩鈣鈦礦快速反應結晶進而形成大晶粒尺寸且無缺陷之鈣鈦礦主動層，藉此提升元件能量轉換效率(power conversion efficiency, PCE)。 研究結果顯示，1 wt% AgCl摻雜及0.5 wt% DMF添加劑反應形成之鈣鈦礦主動層，可生成較大晶粒尺寸之鈣鈦礦結晶提升主動層對於光之吸收強度。在優化條件下元件展現出優異的光轉換能力、低遲滯現象以及延長壽命。最佳化之鈣鈦礦太陽能電池元件結構為 ITO/PEDOT:PSS/Perovskite/PCBM/Ag，元件特性:開路電壓(open circuit voltage, VOC)為0.89 V、短路電流密度(short circuit current density, JSC)為11.55 mA/cm2、填充因子(F.F.)為67.43%及PCE為6.90%。

In this thesis, polycrystalline perovskite films were synthesized by applying AgCl doping in PbI2/DMF solution and an additive of DMF into MAI/IPA solution using a two-step spin-coating method. Employing silver iodide (Ag+), chlorine incorporation and an additive of DMF could ingeniously prevent volume expansion and retard the crystal growth appropriately to further facilitate charge-transfer efficiency in pinhole-free perovskite films Under the conditions of doping 1 wt% of AgCl and 0.5 wt% of DMF as an additive to make the perovskite crystal-growth slowly and fabricate uniformly perovskite film with void-free and large grain size. The perovskite films exhibit an optimum light harvesting capability. Optimized solar cells achieve the highest power conversion efficiency (PCE) of 6.90% and fill factor (F.F.) of 67.43%, which is 35.0% higher than that of the pure PbI2-based one. This work provides a simple, low-cost but effective strategy to improve the PCE of the perovskite solar cells.

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