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Issue 33, 2016
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Tuning band alignment by CdS layers using a SILAR method to enhance TiO2/CdS/CdSe quantum-dot solar-cell performance

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Abstract

We report tuning band alignment by optimized CdS layers using a SILAR method to achieve the recorded best performance with about 6% PCE in TiO2/CdS/CdSe QDSSCs. Combining experimental and theoretical studies, we find that a better lattices match between CdS and TiO2 assists the growth of CdSe, and the combined effect of charge transfer and surface dipole moment at the TiO2/CdS/CdSe interface shifts the energy levels of TiO2 upward and increases Voc of the solar cells. More importantly, the band gap of CdS buffer layers is sensitive to the distortion induced by lattice mismatch and numbers of CdS layers. For example, the barrier for charge transfer disappears when there are more than 4 layers of CdS, facilitating the charge injection from CdSe to TiO2.

Graphical abstract: Tuning band alignment by CdS layers using a SILAR method to enhance TiO2/CdS/CdSe quantum-dot solar-cell performance

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Publication details

The article was received on 24 Feb 2016, accepted on 21 Mar 2016 and first published on 21 Mar 2016


Article type: Communication
DOI: 10.1039/C6CC01664B
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Citation: Chem. Commun., 2016,52, 5706-5709

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    Tuning band alignment by CdS layers using a SILAR method to enhance TiO2/CdS/CdSe quantum-dot solar-cell performance

    B. Zhang, J. Zheng, X. Li, Y. Fang, L. Wang, Y. Lin and F. Pan, Chem. Commun., 2016, 52, 5706
    DOI: 10.1039/C6CC01664B

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