We present theoretical and experimental results in PbS nanocrystalline thin films systematically doped with Co²⁺ ions utilizing the green Chemical Bath Deposition technique at ∼90 °C. All growth parameters are kept constant by systematically adding different solution's volume containing the Co²⁺ ions. We apply the first-order chemical kinetic reaction model to investigate some physicochemical parameters. The crystalline phase is investigated by X-ray Diffraction, identifying the cubic phase in all samples. After dopping the PbS sample (PbSCo²⁺), the grain size decreases from ∼29.7 nm to ∼15.7 nm and dislocation density increases from ∼3.4 lines m^-2 to ∼6.4 lines m^-2. The absorbance and bandgap studies conducted in the Vis-UV region show the typical ¹S_e→¹S_h and ¹S_e→¹P_h electronic transitions and the excitonic bands located at ∼1.5 eV and ∼1.8 eV due to higher energy transitions from ¹D_h→¹D_e, and ¹F_h→¹F_e respectively in nanocrystals. Finally, we apply three theoretical models to elucidate the correlation associated with the crystal radius and the bandgap energy (E_g).

我们利用绿色化学浴沉积技术在约90°C的温度下系统地掺杂Co ²⁺离子的PbS纳米晶体薄膜中提供了理论和实验结果。通过系统地添加包含Co ²⁺离子的不同溶液体积，可使所有生长参数保持恒定。我们应用一阶化学动力学反应模型来研究一些理化参数。通过X射线衍射研究结晶相，确定所有样品中的立方相。掺杂PbS样品（PbSCo ²⁺）后，晶粒尺寸从〜29.7 nm减小到〜15.7 nm，位错密度从〜3.4线m ^-2增大到〜6.4线m ^-2。在Vis-UV区进行的吸光度和带隙研究表明，典型的¹ S _e → ¹ S _h和¹ S _e → ¹ P _h电子跃迁，由于较高的能量跃迁，激子能带位于〜1.5 eV和〜1.8 eV从¹ D _h → ¹ D _e，和¹ F _h → ¹ F _e分别在纳米晶体中。最后，我们应用三个理论模型来阐明与晶体半径和带隙能量（E _g）。