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Open AccessFeature PaperArticle

TiO2 Passivation Layer on ZnO Hollow Microspheres for Quantum Dots Sensitized Solar Cells with Improved Light Harvesting and Electron Collection

by Zhen Li 1,2,*, Libo Yu 1,2,*, Hao Wang 1, Huiwen Yang 1 and Huan Ma 1
1
College of Chemistry and Chemical Engineering, Hexi University, Zhangye City 734000, China
2
Key Laboratory of Hexi Corridor Resources Utilization of Gansu, Hexi University, Zhangye City 734000, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 631; https://doi.org/10.3390/nano10040631
Received: 7 March 2020 / Revised: 22 March 2020 / Accepted: 24 March 2020 / Published: 28 March 2020
(This article belongs to the Special Issue Functional Inorganic Nanomaterials)
Light harvesting and electron recombination are essential factors that influence photovoltaic performance of quantum dots sensitized solar cells (QDSSCs). ZnO hollow microspheres (HMS) as architectures in QDSSCs are beneficial in improving light scattering, facilitating the enhancement of light harvesting efficiency. However, this advantage is greatly weakened by defects located at the surface of ZnO HMS. Therefore, we prepared a composite hollow microsphere structure consisting of ZnO HMS coated by TiO2 layer that is obtained by immersing ZnO HMS architectures in TiCl4 aqueous solution. This TiO2-passivated ZnO HMS architecture is designed to yield good light harvesting, reduced charge recombination, and longer electron lifetime. As a result, the power conversion efficiency (PCE) of QDSSC reaches to 3.16% with an optimal thickness of TiO2 passivation layer, which is much higher when compared to 1.54% for QDSSC based on bare ZnO HMS. View Full-Text
Keywords: TiO2 passivation layer; ZnO hollow microspheres; quantum dots sensitized solar cells TiO2 passivation layer; ZnO hollow microspheres; quantum dots sensitized solar cells
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MDPI and ACS Style

Li, Z.; Yu, L.; Wang, H.; Yang, H.; Ma, H. TiO2 Passivation Layer on ZnO Hollow Microspheres for Quantum Dots Sensitized Solar Cells with Improved Light Harvesting and Electron Collection. Nanomaterials 2020, 10, 631.

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