The fabrication of ZnO solar cells double-sensitized by CdS@CdSe quantum dots through anion exchange method
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The fabrication of ZnO solar cells double-sensitized by CdS@CdSe quantum dots through anion exchange method Hongbo Liu1, Hongmei Luan1, Yunfei Sun2,*, Jie Hu3, Fengyou Wang1, Yingrui Sui1, Shiquan Lv1, and Lili Yang1,* 1
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, Jilin, China 2 College of Information Technology, Jilin Normal University, Changchun 130103, Jilin, China 3 Department of Mechanical Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA
Received: 16 October 2019
ABSTRACT
Accepted: 20 September 2020
CdS@CdSe QDs were introduced onto the interface of ZnO nanorods by SILAR and anionic replacement process. A wide light absorption spectrum was obtained in the CdS@CdSe QDs double-sensitized solar cells. The conversion efficiency of the ZnO solar cell is 1.06% (Voc = 0.58 V, Jsc = 5.90 mA/cm2, FF = 0.31). Band alignment was investigated by UPS pattern. The consequence implies that the energy level structure of CdS@CdSe QDs double-sensitized solar cell varied compared with a single-sensitized one. This new appearance of CdSe can not only work efficiently on broadening the absorption wavelength, but also promote the efficiency of charge injection. Ultimately, photovoltaic performance of the CdS@CdSe double-sensitized device was improved.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Solar cell is becoming an important photovoltaic conversion device in modern world, more and more researchers participate in the investigation of solar cell [1–3]. Quantum dot-sensitized solar cells (QDSSCs), as a third-generation solar cells, are famous for simple fabrication processes and low price. So far, QDSSCs as promising devices are widely studied by many scientific research workers for the effect of multiexciton [4–11].
CdS [12–14] and CdSe [15–19] are usually applied in QDSSCs due to their high absorption intensity between 400 and 800 nm in the wavelength of sunlight. Sun et al. [13] reported that CdS QDs were utilized to sensitize TiO2 nanostructure. CdS/TiO2 structure is sensitive to the visible region of the sunlight and photoelectric performance of the structure is good, which suggests important applications of CdS QDs in solar cell application. Hongkang Wang developed a relatively convenient low-temperature method to fabricate CdSe quantum dots within thin films and CdSe/TiO2 nanostructure was formed. The
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https://doi.org/10.1007/s10854-020-04529-7
J Mater Sci: Mater Electron
CdSe quantum dots are uniformly distributed, the conversion efficiency of 2.2% was obtained in the ultimate solar cell device. Since the bandgap of CdS and CdS is diverse, absorption region of CdS and CdSe is different. If both CdS and CdSe are used in one QDs sensitized solar cell, performance of the photovoltaic device will be improved remarkably as the photo-absorption is enhanced. Moreover, CdSe is capable of bein
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