基于持续光电流的SnS薄膜及其光伏应用研究
A study of SnS thin films and its suitability for photovoltaic application based on the existence of persistent photocurrent
摘要：
硫化锡是一种层状化合物，当通过热蒸发沉积为薄膜时，其保持其结构。发现薄膜具有取向生长，取向方向随薄膜厚度而变化。发现薄膜的形貌随取向而变化。较厚样品的导电性差，这使得很难进行光电导特性。然而，与报道不同的是，较薄的样品显示出与薄膜厚度和晶粒尺寸无关的光敏性，具有高的持续光电流。由于它们的吸收、光敏性、最佳带隙和带隙内的陷阱使载流子具有更长的寿命，硫化锡的薄样品提供了足够的范围来设计有效的光致发光材料。折射率模型采用Sellmeir模型，而以前的研究大多采用Wemple-DiDomenico单振子模型或柯西色散关系。报告了Sellmeir的拟合参数，可用于椭圆偏振研究。
英文摘要：
Tin Sulphide is a layered compound which retains its structure when deposited as thin films by thermal evaporation. The films were found to have oriented growth with the direction of orientation changing with film thickness. The film's morphology was found to change with orientation. The poor conductivity of the thicker samples made it difficult to make photocunductivity characterisation. However, unlike reported the thinner samples showed photo-sensitivity to be independent of film thickness and grain size with a high persistent photocurrent. With their absorption, photosensitivty, optimum band-gap and traps within the band-gap giving the charge carriers a longer life-time, thin samples of tin sulphide gives adequate scope designing efficient photovoltaics. The refractive index was modeled using Sellmeir's model, while most of the previous studies talk of Wemple-DiDomenico single oscillator model or Cauchy's dispersion relation. The Sellmeir's fitting parameters are reported which can be of use in ellipsometric studies.
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