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The application of fluorine-modified PEDOT:PSS on recovering the S-shaped curve and improving reliability for the organic solar cells
organic solar cell
本研究中的有機太陽能電池以ITO基板塗佈上PEDOT:PSS成膜再利用旋轉塗佈P3HT與PCBM混合層(blend)當作吸光材料，並蒸鍍BCP當作電洞阻擋層(hloe blocking layer)和Ag當作陰極。
提高元件的耐久度研究上，相較於標準元件其耐久時間可延長三倍。元件封裝後經過一個月，未經氟修飾之元件，效率只剩下0.61%，而經過F2含氟分子修飾之元件效率為1.88% 。 探討效率降低的主要原因是來自Voc的大幅下降(從0.64 V降至0.45 V)，原因在於BCP緩衝層損壞所造成。|
In this study, we investigate the s-shape recovery and the improvement of reliability of the fluorine-modified poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) buffer layer based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blends polymer photovoltaic cells. The results of humidity-controlled experiments show that the degradation of the device performance can be recovered simply by the interfacial modification, even though the PEDOT:PSS layer has been seriously deteriorated by the air ambient. The anomalous S-shape photocurrent owing to the deterioration of the PEDOT:PSS layer can be rectified significantly as an ideal diode behavior by the surface treatments with fluorine-containing materials. Accordingly, the great enhancements of Fill factor from 30% to 62% can be achieved, where the efficiency is improved from 1.90% to 4.09%. The mechanism is due to the interfacial dipole and hydrophobicity generating by fluorine-modified PEDOT:PSS layer. Moreover, the reliability of the devices with modification shows significant increase than those without modification. The efficiency of the modified devices retains about half (1.9%) of its initial efficiency (4.1%) after 30 days compared to the unmodified one (0.6%). This phenomenon is investigated and reported for the first time. Furthermore, the overall device performance is also enhanced by ~20% as compared with the control device.
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