鈣鈦礦太陽能電池之阻抗分析

鈣鈦礦薄膜太陽能電池從2009年發展到現在，鈣鈦礦太陽能電池的結構從介孔結構到平面異質接面 p-i-n 結構，除了製程變方便之外效率也有一定的突破。本論文所製作的鈣鈦礦太陽能電池中的鈣鈦礦薄膜是利用旋轉塗佈的方式做沉積，將 CH3NH3PbI3 和 PbI2 混和溶液在基板上作旋轉塗佈，在特定的時間參數下滴差溶劑做快速結晶。在第一個實驗中，做了 Delay time 為2、4、6秒的條件，並且比較其電性跟電化學阻抗以及觀察薄膜的表面形貌。在第二個實驗中，做了有無添加 DMSO 及不同的旋轉塗佈轉速(5000 rpm、6000rpm)，並且比較其電性跟電化學阻抗以及觀察薄膜的表面形貌。結果發現在第一個實驗當中 Delay time 為2秒的條件，其表面孔洞很多且很大，光轉電效率平均為1.17%。Delay time 為4秒的條件其表面也有少許孔洞，光轉電效率平均表現為9.32%。Delay time 為6秒的條件其表面平整，光轉電效率平均為7.68%，但是光轉電效率超過10%的元件很多。第二個實驗當中有添加DMSO的開路電壓及填充因子會提高，轉速為6000 rpm的元件電流密度較高。在不照光0V狀況下量測的阻抗圖形有效率越好復合電阻越高的現象；好的元件有外加偏壓越高復合電阻越小的趨勢。

關鍵字

鈣鈦礦太陽能電池,電性量測,阻抗

並列摘要

Since 2009 to nowadays, Perovskite solar cells have a good development. Perovskite solar cells from mesoporous structures to heterojunction plane p-i-n structures have something improved. In addition to production process becoming simpler also have better efficiency. We report that flat, uniform thin films of this material can be deposited by a one-step, solvent-induced, fast crystallization method involving spin coating of a DMF solution of CH3NH3PbI3 followed immediately by exposure to chlorobenzene to induce crystallization. In the first experiment, we set different delay time (2 s/ 4 s /6 s) to drop the poor solvent. And we observed their surface topography, electrical measurement, and electrochemical impedance. In the second experiment, there are four different conditions on the Perovskite thin films. Added DMSO or not and two different spin coating transfers speeds (5000 rpm, 6000rpm). And then we observed their surface topography, electrical measurement, and electrochemical impedance. In the first experiment, we found there are many holes on the surface which delay time is 2 seconds. And its average efficiency achieves 1.17%. In addition, a little holes on the surface which delay time is 4 seconds. However, its average efficiency achieves 9.32%. At last, there are a flat thin film when the delay time is 6. Although its average efficiency only achieves 7.68%, but there are many samples’ efficiency achieve more than 10%. In the second experiment, we found that adding DMSO contribute to improving open circuit voltage and fill factor. And current density is higher when rotating speed at 6000 rpm. The electrochemical impedance is measured without illumination and the potential is 0V. We found the efficiency is higher and the recombination resistance is higher. Applied bias voltage is higher and the recombination resistance is smaller.

並列關鍵字

Perovskite solar cells,impedance spectroscopic

參考文獻

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鈣鈦礦太陽能電池之阻抗分析

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