以光激螢光光譜與電性量測研究甲基胺碘鉛 (CH3NH3PbI3) 鈣鈦礦的穩定性

Study on the Stability of Methylaamine Iodide Lead (CH3NH3PbI3) Perovskite by Photoluminescence Spectroscopy and Electrical Measurement

郭國盛(Kuo-Sheng Kuo)

指導教授 ： 鐘元良

中原大學/理學院/物理研究所/碩士(2018年)

https://doi.org/10.6840/cycu201800720

摘要

在一般環境下，有機－無機混成鈣鈦礦的穩定性非常差，其很容易與外界環境中的元素發生反應進而降解。而我們為了提升甲胺碘鉛鈣鈦礦的穩定性，嘗試使用覆蓋保護層的方式，讓保護層隔絕鈣鈦礦樣品及外界大氣環境。我們分別使用了二氧化矽以及氟化鋰兩種材料作為保護層，其原因為這兩種材料都可以不影響到之後電性量測上的進行，同時在數十奈米厚的情況之下，這兩種材料所製的保護層也都具有不錯的光穿透率而不影響到光致發光量測的進行。接著我們以光致發光量測以及電性量測兩種方式來驗證甲胺碘鉛鈣鈦礦隨著時間以及隨著量測次數上的改變。從實驗結果中，我們發現兩種保護層材料都有發揮隔絕大氣中的氣體以提升樣品穩定性的作用。不過在二氧化矽的保護層製作中，容易使氧氣擴散進入甲胺碘鉛鈣鈦礦的晶格之中，使得在經過量測之後的樣品會迅速發生降解。而氟化鋰保護層之樣品則可以有效的發揮作用，大幅提升甲胺碘鉛鈣鈦礦之穩定性。

關鍵字

鈣鈦礦 ； 甲基胺碘鉛 ； 光激螢光

並列摘要

The organic-inorganic hybrid perovskite has very poor stability in the environment; it easily reacts with elements in the environment to degrade.
To improve the stability of the methotrexate lead perovskite, we tried to using a cover layer to keep the perovskite sample from the harmful element in the environment.
We use SiO2 and LiF as cover layer, because this two materials won’t affect the electrical measurement, and tens of nanometers thick of this two materials have good light transmittance without affecting the photoluminescence measurement.
Then we used photoluminescence measurement and electrical measurement to verify the change of methyl iodide lead perovskite with time and with the number of measurements.
From the experimental results, we found that both protective layer materials have the effect of insulating the gas in the atmosphere to improve the stability of the sample.
However, in the production of the cover layer of SiO2, it’s easy to diffuse oxygen into the crystal lattice of the methyl iodide-lead perovskite, so that the sample after the measurement is rapidly degraded. The lithium fluoride protective layer sample can effectively play a role in greatly improving the stability of the MAPbI3 perovskite.

並列關鍵字

Perovskite ； CH3NH3PbI3 ； Photoluminescence Spectroscopy

參考文獻

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