Abstract
In this paper we have presented a power conversion efficiency (PCE) enhanced Pb-chalcogenide/CdS quantum dots (QDs) solar cells with novel tandem absorption layers synthesized by using chemical bath deposition (CBD) method. The tandem absorption layer is assembled by orderly stacking PbS-QDs layer, PbS-QDiM layer and PbSe-QDiM layer. Compared to single layer PbS-QDs/CdS solar cells, the solar cell with double-tandem layers (PbS-QDiM/QDs) shows the highest short current density (Jsc) of 47.5mA/cm2 due to smoothing of the photo-generated carrier transportation and enhancing the absorption in the visible region 530–800nm. However, the decreased open circuit voltage (Voc) of 0.14eV results in a low power conversion efficiency (PCE) of 2.2%. The triple-tandem absorber (PbSe-QDiM/PbS-QDiM/QDs) enhances the spectra absorption both in the visible (500–800nm) and near-infrared (1000–1700nm) regions, resulting in a higher short current density (Jsc) of 40mA/cm2, while keeping a relatively large open circuit voltage (Voc) of 0.28eV. Through an architectural modification, an enhancement of power conversion efficiency (PCE) of 4.2% has been achieved.
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