PbS QDs and PbS QDs decorated with reduced graphene (rGO) are prepared by hot-injection method using PbO and hexamethyldisilathiane (HMDS) as Pb and S sources, respectively. PbS QDs and PbS QDs:rGO are used as an addition to poly(3-hexylthiophene-2,5-diyl):phenyl-C₆₁-butyric acid methyl ester (P3HT:PC₆₁BM) composite. The effect of their addition on the morphological, topographical and optical properties of spin-coated P3HT:PC₆₁BM thin films are investigated. These additions tune the films to be more homogenous and more flatness as investigated in terms of field scanning electron microscope. The topographical properties of the films are explored by atomic force microscope. The results show decreasing in the grain size and the surface roughness in P3HT:PbSQDs:PC₆₁BM film compared to other composites films. The optical properties of the films are studied over the spectral range 200–2500 nm. On one hand, the absorption coefficient of different films is computed and the optical band gap of the films is found to decrease after addition of PbS QDs and PbS QDs:rGO. On the other hand, the refractive index of the films is explained according to the single-oscillator model to get the dispersion parameters. In addition, the lattice dielectric constant and the ratio of the free-carriers concertation to their effective mass are evaluated.

分别以PbO和六甲基二硅硫烷(HMDS)为Pb源和S源，通过热注射法制备了PbS量子点和还原石墨烯(rGO)修饰的PbS量子点。PbS QD 和 PbS QD:rGO 用作聚(3-己基噻吩-2,5-二基):苯基-C ₆₁ -丁酸甲酯(P3HT:PC ₆₁ BM)复合材料的添加剂。研究了它们的添加对旋涂 P3HT:PC ₆₁ BM 薄膜的形态、形貌和光学性能的影响。根据场扫描电子显微镜的研究，这些添加物使薄膜变得更加均匀和平坦。通过原子力显微镜探索薄膜的形貌特性。结果表明，与其他复合薄膜相比，P3HT:PbSQDs:PC ₆₁ BM 薄膜的晶粒尺寸和表面粗糙度有所减小。在 200–2500 nm 的光谱范围内研究了薄膜的光学特性。一方面，计算了不同薄膜的吸收系数，发现添加PbS QDs和PbS QDs:rGO后薄膜的光学带隙减小。另一方面，根据单振荡器模型解释薄膜的折射率，得到色散参数。此外，还评估了晶格介电常数以及自由载流子协同与其有效质量的比率。