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Influence of Mn+2 incorporation in CdSe quantum dots for high performance of CdS–CdSe quantum dot sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
26432 43952 2016 8 PDF Available
Title
Influence of Mn+2 incorporation in CdSe quantum dots for high performance of CdS–CdSe quantum dot sensitized solar cells
Abstract

•Effect of Mn-doping on the photovoltaic performance of QDSSCs was investigated.•22% increase in PCE is achieved in Mn-doped CdS–CdSe than the bare CdS–CdSe QDSSCs.•The photo-excited electron lifetimes in the photoanode were significantly improved.•The stability of CdS–Mn–CdSe is superior to CdS–CdSe QDSSCs.

Quantum dot sensitized solar cells (QDSSCs) have attracted considerable attention recently and become promising candidates for realizing a cost-effective and facile fabrication of solar cell with improved photovoltaic performance. QDs were directly grown on the TiO2 mesostructure by the successive ionic layer absorption and reaction (SILAR) technique. QDSSC based on CdS–CdSe photoanode achieves a power conversion efficiency of 3.42% under AM 1.5 G one sun illumination. The loading of Mn+2 metal ions was applied to a CdSe (CdS–Mn–CdSe) photoanode to enhance the absorption in QDSSCs, which greatly improved the power conversion efficiency. Without the passivation layer, the solar cell based on a CdS–Mn–CdSe QD-sensitized TiO2 photoelectrode shows higher Jsc (14.67 mA/cm2), Voc (0.590 V) and power conversion efficiency (4.42%) comparing to Mn-undoped CdS–CdSe QD sensitized TiO2 (Jsc: 11.29 mA/cm2, Voc: 0.568 V, and efficiency: 3.42%), which can be ascribed to superior light absorption, faster electron transport and slower charge recombination for the former. The effective electron lifetime of the device with CdS–Mn–CdSe was higher than those with CdS–CdSe, leading to more efficient electron–hole separation and slower electron recombination. The effects of Mn+2 metal ions on the chemical, physical, and photovoltaic properties of the QDSSCs have been investigated have been investigated by X-ray photon spectroscopy (XPS), UV–vis spectra, photocurrent–voltage (J–V) characteristics and electrochemical impedance spectra (EIS).

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Keywords
Quantum dot sensitized solar cells; Mn-doping; CdSe; Stability; Recombination
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Influence of Mn+2 incorporation in CdSe quantum dots for high performance of CdS–CdSe quantum dot sensitized solar cells
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 315, 15 January 2016, Pages 34–41
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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