Solution processed CdTe/CdSe nanocrystal solar cells with more than 5.5% efficiency by using an inverted device structure

Liu, Ran; Tian, Yiyao; Zhang, Yijie; Gao, Kuo; Lu, Kuankuan; Wu, Rongfang; Qin, Donghuan; Wu, Hongbin; Peng, Zuosheng; Hou, Lintao; Huang, Wenbo

doi:10.1039/c4tc02816c

Cited by 41 publications

(43 citation statements)

References 33 publications

(67 reference statements)

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“…ZnO precursor and CdTe NCs were prepared by the method reported in previous works [23,24]. CdS NCs were fabricated by a non-injection method (CdS NC is formed gradually during the reaction) using tetraethylthiuram disufide and 2,2 -dithiobisbenzothiazole as nucleation initiators [38].…”

Section: Synthesis Methodsmentioning

confidence: 99%

Solution-Processed Efficient Nanocrystal Solar Cells Based on CdTe and CdS Nanocrystals

Liu

Heng

et al. 2018

Coatings

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Solution-processed CdTe nanocrystals solar cells have attracted much attention due to their low cost, low material consumption, and potential for roll-to-roll production. Among all kinds of semiconductor materials, CdS exhibits the lowest lattice mismatch with CdTe, which permits high junction quality and high device performance. In this study, high quality CdS nanocrystals were prepared by a non-injection technique with tetraethylthiuram disufide and 2,2 -dithiobisbenzothiazole as the stabilizers. Based on the CdTe and CdS nanocrystals, devices with the architecture of ITO/ZnO/CdS/CdTe/MoO x /Au were fabricated successfully by a solution process under ambient condition. The effects of annealing conditions, film thickness, and detailed device structure on the CdTe/CdS nanocrystal solar cells were investigated and discussed in detail. We demonstrate that high junction quality can be obtained by using CdS nanocrystal thin film compared to traditional CdS film via chemical bath deposition (CBD). The best device had short circuit current density (J sc ), open circuit voltage (V oc ) and fill factor (FF) of 17.26 mA/cm 2 , 0.56 V, and 52.84%, respectively, resulting in a power conversion efficiency (PCE) of 5.14%, which is significantly higher than that reported using CBD CdS as the window layer. This work provides important suggestions for the further improvement of efficiency in CdTe nanocrystal solar cells.

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Section: Synthesis Methodsmentioning

confidence: 99%

Solution-Processed Efficient Nanocrystal Solar Cells Based on CdTe and CdS Nanocrystals

Liu

Heng

et al. 2018

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“…The thickness of the ZnSe NC buffer layer and the annealing temperature have great impact on the performance of NC solar cells, as shown in Figure 2e, f. To compare device performance with different thicknesses of ZnSe NC, all the samples are prepared at the same conditions and annealed at 350 • C with CdCl 2 treatment after five layers of CdTe NC are deposited. We found that the J sc increases from 3.58 mA/cm 2 to 10.35 mA/cm 2 when ZnSe thickness increases from 25 nm to 110 nm and decreases to 5.61 mA/cm 2 at 125 nm, which is significantly lower than the thickness among CdTe/CdSe or CdTe/CdS NC solar cells [10,19]. By contrast, the thickness of the ZnSe NC buffer layer has significant effects on the V oc , FF (fill factor), and PCE of NC solar cells.…”

Section: Resultsmentioning

confidence: 89%

“…The ZnO precursor and CdTe NCs synthesis is similar to methods reported previously [10]. ZnSe NCs were fabricated by using the hot injection method with ZnO as a precursor [30,31].…”

Section: Nanocrystal (Nc) Synthesismentioning

confidence: 99%

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Solution-Processed CdTe Thin-Film Solar Cells Using ZnSe Nanocrystal as a Buffer Layer

et al. 2018

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Abstract:The CdTe nanocrystal (NC) is an outstanding, low-cost photovoltaic material for highly efficient solution-processed thin-film solar cells. Currently, most CdTe NC thin-film solar cells are based on CdSe, ZnO, or CdS buffer layers. In this study, a wide bandgap and Cd-free ZnSe NC is introduced for the first time as the buffer layer for all solution-processed CdTe/ZnSe NC hetero-junction thin-film solar cells with a configuration of ITO/ZnO/ZnSe/CdTe/MoOx/Au. The dependence of the thickness of the ZnSe NC film, the annealing temperature and the chemical treatment on the performance of NC solar cells are investigated and discussed in detail. We further develop a ligand-exchanging strategy that involves 1,2-ethanedithiol (EDT) during the fabrication of ZnSe NC film. An improved power conversion efficiency (PCE) of 3.58% is obtained, which is increased by 16.6% when compared to a device without the EDT treatment. We believe that using ZnSe NC as the buffer layer holds the potential for developing high-efficiency, low cost, and stable CdTe NC-based solar cells.

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“…They demonstrated minimal differences in film morphology and device performance in devices fabricated by using toxic salt of cadmium chloride or non-toxic salt of NH 4 Cl. More recently, Qin et al [59] developed a novel inverted device structure of ITO/ZnO/CdSe/CdTe/Au. This devices structure has many benefits.…”

Section: Cdte/cdse Ncs Heterojunction Solar Cellsmentioning

confidence: 99%

Recent Progress on Solution-Processed CdTe Nanocrystals Solar Cells

Hao

Xie

et al. 2016

Applied Sciences

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Solution-processed CdTe nanocrystals (NCs) photovoltaic devices have many advantages, both in commercial manufacture and daily operation, due to the low-cost fabrication process, which becomes a competitive candidate for next-generation solar cells. All solution-processed CdTe NCs solar cells were first reported in 2005. In recent years, they have increased over four-fold in power conversion efficiency. The latest devices achieve AM 1.5 G power conversion efficiency up to 12.0%, values comparable to those of commercial thin film CdTe/CdS solar cells fabricated by the close-space sublimation (CSS) method. Here we review the progress and prospects in this field, focusing on new insights into CdTe NCs synthesized, device fabrication, NC solar cell operation, and how these findings give guidance on optimizing solar cell performance.

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Solution processed CdTe/CdSe nanocrystal solar cells with more than 5.5% efficiency by using an inverted device structure

Cited by 41 publications

References 33 publications

Solution-Processed Efficient Nanocrystal Solar Cells Based on CdTe and CdS Nanocrystals

Solution-Processed Efficient Nanocrystal Solar Cells Based on CdTe and CdS Nanocrystals

Solution-Processed CdTe Thin-Film Solar Cells Using ZnSe Nanocrystal as a Buffer Layer

Recent Progress on Solution-Processed CdTe Nanocrystals Solar Cells

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