Tailoring Absorber Thickness and the Absorber-Scaffold Interface in CdSe-Coated ZnO Nanowire Extremely Thin Absorber Solar Cells

Majidi, Hasti; Edley, Michael E.; Spangler, Leah C.; Baxter, Jason B.

doi:10.1016/j.electacta.2014.07.150

Cited by 12 publications

(25 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additional details on the physical structure and relationship to processing parameters can be found in our earlier reports. ,, Electrodeposited CdSe is an appropriate candidate for consideration in ETA cells because the length scale for charge collection is significantly shorter than the length scale for light absorption. Our previous work on planar cells showed that internal quantum efficiency (IQE) decreased for CdSe thicknesses beyond 50 nm because of uncollected holes . However, the light harvesting efficiency (LHE) for 500 nm photons was found to be only 20% with a CdSe thickness of 50 nm.…”

Section: Resultsmentioning

confidence: 99%

“…ETA cell photoanodes consisting of CdSe-coated ZnO nanowire arrays with an ultrathin CdS buffer layer were fabricated following procedures that we have published previously . All samples were prepared on FTO (Sn 2 O:F, TEC 15) purchased from Hartford Glass or on ITO (Sn:In 2 O 3 ).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Before nanowire growth, FTO substrates were seeded with ZnO films via dip coating in an ethanolic solution of zinc acetate and monoethanolamine. To improve nucleation of CdSe and prevent shunting, an ultrathin CdS (5 nm) buffer layer was deposited via 16 cycles of successive ionic layer adsorption and reaction (SILAR) with 50 mM cadmium sulfate and 50 mM sodium sulfide …”

Section: Experimental Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Ultrafast Charge Carrier Dynamics in Extremely Thin Absorber (ETA) Solar Cells Consisting of CdSe-Coated ZnO Nanowires

Edley

Guglietta

et al. 2016

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

The extremely thin absorber (ETA) solar cell architecture can enable higher efficiencies than planar cells for absorbers that have low carrier lifetimes or mobilities. Efficient charge separation requires that interfacial electron and hole transfer proceed much faster than the recombination lifetime of photoexcited carriers. In this work, transient absorption spectroscopy was employed to measure these ultrafast photophysical processes in CdSe-coated ZnO nanowire ETA cells and model planar films. At low pump fluences, carrier lifetime was controlled by Shockley–Read–Hall and surface recombination. Annealing the electrodeposited CdSe films increased the lifetime 50-fold, to >1 ns as measured by transient absorption spectroscopy, which correlated to improved ETA cell performance. Interfacial electron transfer from the CdSe coating into the ZnO nanowires occurred 3 orders of magnitude faster, within 1 ps, independent of the presence or absence of an interfacial CdS buffer layer. Interfacial hole transfer to the ferri(o)cyanide redox couple could not be directly measured, but photodegradation of the semiconductor surface in the presence of electrolyte under prolonged light exposure resulted in faster dynamic response due to higher densities of surface electron trap states. This study provides a framework for understanding photophysics and improving performance of nanostructured, semiconductor-sensitized solar cells through a combination of device measurements and ultrafast probes.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast Charge Carrier Dynamics in Extremely Thin Absorber (ETA) Solar Cells Consisting of CdSe-Coated ZnO Nanowires

Edley

Guglietta

et al. 2016

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has been theoretically and experimentally proved that the microstructure of the heterojunction networks is essential for the performance of nanostructured solar cells. 13,[18][19][20] Therefore, understanding the formation mechanism and well controlling the microstructure of the heterojunction networks are the prerequisite for the fabrication of high-performance solar cells. As for the heterojunction networks in the glassceramics GeSe 2 -Sb 2 Se 3 -CuI, its formation is intimately related to the crystallization process.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, nanostructured cells using organic absorber materials are widely studied, such as bulk heterojunction organic photovoltaic cells and hybrid solar cells . Despite the diversity of device structures (e.g., nanoporous, nanowire arrays, and blended polymers), all these cells contain heterojunction networks at submicrometer scales in order to benefit from nanoscale effects. Due to the significantly reduced dimension of the absorber layer, the charge generation occurs much closer to an interface where charge separation occurs, than that in a regular flat cell .…”

Section: Introductionmentioning

confidence: 99%

Formation of Heterojunction Networks in the Photoelectrical Glass–Ceramics: A Thermal Analysis

et al. 2016

View full text Add to dashboard Cite

The photoelectrical glass-ceramics GeSe 2 -Sb 2 Se 3 -CuI which contain self-organized heterojunction networks is a novel and promising photovoltaic material. Here, a series of these glassceramics with gradually changed GeSe 2 /Sb 2 Se 3 ratios are studied. The composition dependence of the crystallization behavior is analyzed by differential scanning calorimetry and compared with the composition dependence of the photoelectrical properties. It is revealed that the glass-ceramics with evident photoelectrical response show two common features in differential scanning calorimetry curves: an overlapping crystallization peak attributed to the coprecipitation of Cu 2 GeSe 3 and Sb 2 Se 3 , and peak profiles showing the characteristics of direct impingement growth. Based on these results, it is concluded that the formation of the heterojunction networks in the photoelectrical glass-ceramics is ascribed to the kinetically allowed eutectoid crystallization of Cu 2 GeSe 3 and Sb 2 Se 3 .

show abstract

Synthesis of hierarchical structure cuprous oxide by a novel two-step hydrothermal method and the effect of its addition on the photovoltaic properties of ZnO-based dye-sensitized solar cells

Zhou

Xie

et al. 2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Tailoring Absorber Thickness and the Absorber-Scaffold Interface in CdSe-Coated ZnO Nanowire Extremely Thin Absorber Solar Cells

Cited by 12 publications

References 34 publications

Ultrafast Charge Carrier Dynamics in Extremely Thin Absorber (ETA) Solar Cells Consisting of CdSe-Coated ZnO Nanowires

Ultrafast Charge Carrier Dynamics in Extremely Thin Absorber (ETA) Solar Cells Consisting of CdSe-Coated ZnO Nanowires

Formation of Heterojunction Networks in the Photoelectrical Glass–Ceramics: A Thermal Analysis

Synthesis of hierarchical structure cuprous oxide by a novel two-step hydrothermal method and the effect of its addition on the photovoltaic properties of ZnO-based dye-sensitized solar cells

Contact Info

Product

Resources

About