以溶液製程製備之可撓性鈣鈦礦太陽能電池

Abstract

本研究以噴閥塗佈製備奈米銀線薄膜對電極並搭配低溫燒結之奈米顆粒TiO2電子傳輸層，成功於PEN / ITO基板上開發可撓性平面正規結構鈣鈦礦太陽能電池。接著以短時間紫外光臭氧處理奈米銀線對電極，以提升元件特性。最後，研究可撓性鈣鈦礦太陽能電池在多次彎曲後特性的變化。 研究中奈米銀線對電極以噴閥式塗佈法製備，藉由調控載流氣體(空氣)壓力、噴塗次數與基板加熱溫度對元件進行最佳化。接著，再對奈米銀線對電極面進行紫外光臭氧處理30、60、120與180 s。由電化學阻抗分析顯示，在短時間的紫外光臭氧處理後，奈米銀線/spiro-OMeTAD界面傳輸阻抗有所下降，於處理時間60 s時達到最佳效果，此時元件的能量轉換效率為12.13 %，開路電壓為1.04 V，短路電流密度為19.97 mA/cm2，填充因子為61.5 %；相較於未經紫外光臭氧處理之元件(能量轉換效率11.15 %，開路電壓1.031 V，短路電流密度19.2 mA/cm2與填充因子53.4 %)，效率顯著提升8 %。最後針對紫外光臭氧處理之元件進行彎曲穩定性測試，在經過100次和500次的彎曲後，元件效率仍保持在未彎曲前的94%和75%。

In this study, all-solution processed flexible n-i-p type planar perovskite solar cells were demonstrated by using low-temperature nanoparticle TiO2 electron transpart layers and solution-processed silver nanowires (AgNWs) counter electrodes. Next, an ultraviolet ozone (UVO) treatment was applied to the AgNWs counter electrode to improve the cell performance. Finally, the effect of cyclic bending on the performace of the flexible perovskite cells was investigated. The deposition of AgNWs was carried out by spray coating with air as carrier gas. The optimization paramters include: the pressure of the carrier gas, the number of scans and the substrate temperature. Next, an UVO treatment was performed on the AgNWs counter electrode for 30, 60, 120 and 180 s. The electrochemical impedance spectroscopy analysis reveals that the short UVO treatment can reduce the charger transfer resistance at the spiro-OMeTAD/AgNWs interface. With an optimal UVO treatment duration of 60 s, the cell exhibits a photoelectric conversion efficiency (PCE) of 12.13 %, open circuit voltage (Voc) of 1.04 V, short circuit current density (Jsc) of 19.97 mA/cm2, and fill factor (F.F.) of 61.5 %. Compared with the counterpart without UVO treatment (PCE of 11.15 %, Voc of 1.031 V, Jsc of 19.2 mA/cm2 and F.F. of 53.4 %), the PCE is greatly improved 8 %. Finally, we perform the bending test on the UVO treated cell. After 100 and 500 bending cycles, the cell efficiency remaines at 94% and 75% of its initial value, respectively.