A broadband Pb-chalcogenide/CdS solar cells with tandem quantum-dots embedded in the bulk matrix (QDiM) absorption layers by using chemical bath deposition

作者：Qiu Jijun; Weng Binbin; Ge Wanyin; McDowell Lance L; Cai Zhihua; Shi Zhisheng

来源：Solar Energy Materials and Solar Cells, 2017, 172: 117-123.

DOI：10.1016/j.solmat.2017.07.025

• PbSe
• Solar cells
• Quantum dots embedded in the bulk matrix (QDiM)
• Tandam
• Chemical bath deposition (CBD)

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 (J,) of 47.5 mA/cm(2) due to smoothing of the photo generated carrier transportation and enhancing the absorption in the visible region 530-800 nm. However, the decreased open circuit voltage (V-oc) of 0.14 eV 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 (500-800 nm) and near-infrared (1000-1700 nm) regions, resulting in a higher short current density (J(sc)) of 40 mA/cm(2), while keeping a relatively large open circuit voltage (V-oc) of 0.28 eV. Through an architectural modification, an enhancement of power conversion efficiency (PCE) of 4.2% has been achieved.

• 出版日期2017-12