Organic photovoltaic cells using polymer belonging to the aniline-heteroaryl family as electron donor have been achieved by thermal evaporation. We show that the properties of the polymer film, morphology, molecule or...Organic photovoltaic cells using polymer belonging to the aniline-heteroaryl family as electron donor have been achieved by thermal evaporation. We show that the properties of the polymer film, morphology, molecule order and conductivity depend strongly on the bottom anode buffer layer. While cells without anode buffer layer or with MoO3 or CuI anode buffer layer have been probed, we show that CuI allows improving strongly the cells efficiency through an improvement of the morphology and conductivity of the polymer film. This shows that although it is necessary a good band matching at the interface, this is not sufficient, because the templating effect of CuI on the polymer film is primordial for photovoltaic cells improvement.展开更多
采用真空热蒸发方法,以高纯CdTe粉末为蒸发源,在石英和AZO玻璃上沉积了厚度约为485 nm的CdTe薄膜,随后在N2氛围中于250~400℃条件下进行后退火处理。利用X射线衍射仪、拉曼光谱仪、分光光度计和数字源表测量了不同退火温度条件下样品的...采用真空热蒸发方法,以高纯CdTe粉末为蒸发源,在石英和AZO玻璃上沉积了厚度约为485 nm的CdTe薄膜,随后在N2氛围中于250~400℃条件下进行后退火处理。利用X射线衍射仪、拉曼光谱仪、分光光度计和数字源表测量了不同退火温度条件下样品的结构、光学和电学特性。结果表明,所制备的薄膜为立方闪锌矿结构,择优取向为<111>晶向,提高退火温度可以促进薄膜结晶;光学测量结果证实,随退火温度升高,薄膜样品的光学带隙由1.527 e V减小到1.496 e V;电流-电压测试表明,薄膜电导率随退火温度的增加,由0.97μS/cm增大至87.3μS/cm。展开更多
文摘Organic photovoltaic cells using polymer belonging to the aniline-heteroaryl family as electron donor have been achieved by thermal evaporation. We show that the properties of the polymer film, morphology, molecule order and conductivity depend strongly on the bottom anode buffer layer. While cells without anode buffer layer or with MoO3 or CuI anode buffer layer have been probed, we show that CuI allows improving strongly the cells efficiency through an improvement of the morphology and conductivity of the polymer film. This shows that although it is necessary a good band matching at the interface, this is not sufficient, because the templating effect of CuI on the polymer film is primordial for photovoltaic cells improvement.
文摘采用真空热蒸发方法,以高纯CdTe粉末为蒸发源,在石英和AZO玻璃上沉积了厚度约为485 nm的CdTe薄膜,随后在N2氛围中于250~400℃条件下进行后退火处理。利用X射线衍射仪、拉曼光谱仪、分光光度计和数字源表测量了不同退火温度条件下样品的结构、光学和电学特性。结果表明,所制备的薄膜为立方闪锌矿结构,择优取向为<111>晶向,提高退火温度可以促进薄膜结晶;光学测量结果证实,随退火温度升高,薄膜样品的光学带隙由1.527 e V减小到1.496 e V;电流-电压测试表明,薄膜电导率随退火温度的增加,由0.97μS/cm增大至87.3μS/cm。
