A comparison of ZnS and ZnSe passivation layers on CdS/CdSe co-sensitized quantum dot solar cells

Author(s): Fei Huang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Qifeng Zhang ⁵ ^, ⁶ ^, ⁷ ^, ⁸ , Benke Xu ¹ ^, ² ^, ³ ^, ⁴ , Juan Hou ⁹ ^, ¹⁰ ^, ¹¹ ^, ¹² ^, ⁴ , Yuan Wang ⁵ ^, ⁶ ^, ⁷ ^, ⁸ , Robert C. Massé ⁵ ^, ⁶ ^, ⁷ ^, ⁸ , Shanglong Peng ⁵ ^, ⁶ ^, ⁷ ^, ⁸ , Jianshe Liu ¹ ^, ² ^, ³ ^, ⁴ , Guozhong Cao ⁵ ^, ⁶ ^, ⁷ ^, ⁸

Publication date (Electronic): 2016

Journal: Journal of Materials Chemistry A

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Significant influences of different passivation materials on the performance of the resultant quantum dot-sensitized solar cells (QDSCs) were investigated.

Abstract

The design and synthesis of passivation materials are of significant importance to reducing surface charge recombination in quantum dot-sensitized solar cells (QDSCs). In this study, the systematic characterization and comparison of the optical and electrochemical properties of ZnS and ZnSe passivation layers and their impacts on the performance of the resulting QDSCs have been investigated. The ZnS and ZnSe passivation layers were all deposited viaa reproducible and controlled successive ionic layer adsorption and reaction method. QDSCs with a ZnSe passivation layer demonstrated strongly inhibited interfacial charge recombination and greatly enhanced light harvesting, resulting in a power conversion efficiency of up to 6.4%, which is appreciably higher than 4.9% for the solar cells with a ZnS passivation layer and 3.4% for the solar cells without a passivation layer.

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A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films

Brian C. O'Regan, Michael Grätzel (1991)

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Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers.

Simon Mathew, Aswani Yella, Peng Gao … (2014)

Dye-sensitized solar cells have gained widespread attention in recent years because of their low production costs, ease of fabrication and tunable optical properties, such as colour and transparency. Here, we report a molecularly engineered porphyrin dye, coded SM315, which features the prototypical structure of a donor-π-bridge-acceptor and both maximizes electrolyte compatibility and improves light-harvesting properties. Linear-response, time-dependent density functional theory was used to investigate the perturbations in the electronic structure that lead to improved light harvesting. Using SM315 with the cobalt(II/III) redox shuttle resulted in dye-sensitized solar cells that exhibit a high open-circuit voltage VOC of 0.91 V, short-circuit current density JSC of 18.1 mA cm(-2), fill factor of 0.78 and a power conversion efficiency of 13%.