Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 21, Pages 10525-10529Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm31177a
Keywords
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Funding
- National Natural Science Foundation of China [81071229, 61106056]
- Nature Science Foundation of Hubei Province [2008CDA042]
- Foundation of Wuhan National Laboratory for Optoelectronics [P080017]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100142110002]
- Educational Commission of Hubei Province [B20102802]
- Hust [2010ZD005, 2011TS020]
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Tunable energy band CdSexS(1-x) quantum dots (QD) are developed for QD-sensitized solar cells(QDSSCs) by the successive ionic layer adsorption and reaction (SILAR) technique. The results indicated that the energy band and the light absorption of CdSexS(1-x) QDs could be controlled by the ratio of the sulphur (S) and the selenium (Se). Compared with the conventional CdS/CdSe system, its absorption spectrum and monochromatic incident photon-to-electron conversion efficiency (IPCE) spectrum show higher light harvest ability and a broader response wavelength region. As a result, a high energy conversion efficiency of 2.27% was obtained with the CdSexS(1-x) QDSSCs under AM 1.5 illumination of 100 mW cm(-2). After being further treated with CdSe QDs, the CdSexS(1-x)/CdSe QDSSC yielded an energy conversion efficiency of 3.17% due to the enhanced absorption and the reduced recombination. It can be expected that tunable energy band QDs controlled by the ratio of atoms can contribute to higher efficiency QDSSCs.
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