Interfacial layer for efficiency improvement of solution-processed small molecular solar cells

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• 作者：Yang Liu ; Fujun Zhang ; Haidao Dai ; Weihua Tang ; Zixuan Wang ; Jian Wang ; Aiwei Tang ; Hongsheng Peng ; Zheng Xu ; Yongsheng Wang
• 关键词：Small molecule organic solar cells ; Solution processed ; Interfacial layer ; Power conversion efficiency ; Illumination intensity
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：118
• 期：Complete
• 页码：135-140
• 全文大小：3665 K

文摘

A series of solution-processed small molecular solar cells (SMSCs) were fabricated with 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] (DIB-SQ) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC₇₁BM) as the active layer. The cells with MoO₃ as anode interfacial layer and LiF as cathode interfacial layer have the maximum power conversion efficiency (PCE) 2.68 % , with short circuit density (J_sc) of 8.2 mA/cm², open circuit voltage (V_oc) of 0.9 V and fill factor (FF) of 36.3 % under 100 mW/cm² illumination intensity. The key parameters, including J_sc V_oc, and FF of cells with MoO₃ as anode interfacial layer and LiF as cathode interfacial layer, are improved about 54.7 % , 26.9 % , and 23.5 % compared with these of cells using PEDOT:PSS as anode interfacial layer and LiF as cathode interfacial layer. The underlying reasons are mainly attributed to the effect of MoO₃ layer on charge carrier collection and morphology of active layer. The effect of illumination intensity on the performance of cells was also discussed in detailed.