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Enhanced performance of all solid-state quantum dot-sensitized solar cells via synchronous deposition of PbS and CdS quantum dots

Abstract

All solid-state quantum dot-sensitized solar cells (QDSCs) become increasingly attractive owning to their ability to solve the issues of package difficulty and poor long-term stability. However, the commonly used colloidal lead sulfide (PbS) quantum dots (QDs) suffer from complicated synthesis with the use of high-temperature, harmful organic solvents and protective atmosphere. In this work, the synchronous deposition of PbS and CdS QDs, realized through a facile successive ionic layer adsorption and reaction (SILAR), was proposed to construct efficient and stable solid-state QDSCs. This design concept affords two benefits: (1) the synchronous deposition of two sulfides suppresses the excessive growth of PbS QDs in the mesopores of films, thereby ensuring the efficient electron injection from PbS to TiO2; (2) the intimate interpenetration of two sulfides allows superior passivation of high-density defects on the surface of PbS QDs, which reduces the severe interfacial charge recombination. As a result, the solid-state (Pb,Cd)S QD-sensitized TiO2 solar cell achieved more than 5 times efficiency enhancement in contrast to the conventional PbS/CdS pattern based device. This work highlights the design of novel QD schemes for high performance solid-state solar cells.

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Publication details

The article was received on 25 Oct 2019, accepted on 28 Nov 2019 and first published on 28 Nov 2019


Article type: Paper
DOI: 10.1039/C9NJ05344A
New J. Chem., 2019, Accepted Manuscript

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    Enhanced performance of all solid-state quantum dot-sensitized solar cells via synchronous deposition of PbS and CdS quantum dots

    X. Mao, J. Yu, J. Xu, J. Zhou, C. Luo, L. Wang, H. Niu, J. Xu and R. Zhou, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ05344A

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