【摘 要】
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Cathode buffer layer interface modification is a commonly used strategy to prepare high-efficient organic solar cells (OSCs).Non-fullerene OSCs based on PM7∶ IT-4F were prepared and modified with PFN-
【机 构】
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Department of Physics, Beijing Technology and Business University, Beijing 100048, P.R.China
【出 处】
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第八届新型太阳能材料科学与技术学术研讨会
论文部分内容阅读
Cathode buffer layer interface modification is a commonly used strategy to prepare high-efficient organic solar cells (OSCs).Non-fullerene OSCs based on PM7∶ IT-4F were prepared and modified with PFN-Br cathode buffer layer.The introduction of PFN-Br buffer layer boosts the photovoltaic performance of PM7∶ IT-4F based OSCs obviously,however the stability of the PFN-Br modified device shows a serious degradation.By excluding the influence of heat,oxygen,moisture and light illumination,the degradation was verified to be triggered by the electric effect.As soon as the devices undergo electrical measurement such as applying bias voltage for current density-voltage test,the degradation begins.The degradation mechanism of the PFN-Br modified OSCs was investigated in detail with intensity modulated photovoltage spectroscopy/photocurrent spectroscopy (IMPS/IMVS),photo-induced charge extraction linear increasing voltage (Photo-CELIV),impendence spectroscopy (IS) technology.The results show that the PFN-Br cathode buffer layer is deteriorated and increase the interface resistance between active layer and cathode,which hinder charge transport and collection at the electrode,thus weaken the performance of PM7∶ IT-4F based OSCs.The degradation of PM7∶IT-4F/PFN-Br OSCs induced by electric effect proposed in this study provides a new inspiration for the degradation study of OSCs.
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