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Nanotube p.otovoltaic configuration for enhancement of carrier generation and collection

Nano Research 2015年第10期8卷 3186-3196页

作者： hongmei dang vijay p. singh sai guduru suresh rajap.tra zhi david chen Dep.rtmentofElectricalandComp.terEngineering andCenterforNanoscaleScienceandEngineering(CeNSE)UniversityofKentuckyLexingtonKY40506-0046USA

We rep.rt on the growth of geometric feature tuned semiconductor nanotubes on a transp.rent substrate through the ap.lication of an anodic aluminum oxide membrane-assisted method. Three-dimensional nanotube solar cells are develop.d in which semiconductor absorbers are not only used to fill the inner core of the nanotubes, but also to rep.ace the membrane and to fill the intertube sp.ce between the nanotubes. The nanotube solar cells generate and sep.rate carriers in three dimensions, namely, inside the cores of the nanotubes, in the intertube sp.ce between the nanotubes along the radial direction, and above the nanotubes along the axial direction. In p.eliminary exp.riments conducted to demonstrate the p.tential of this ap.roach, nanotube CdS-CdTe solar cells were fabricated. CdS nanotubes with an inner diameter, wall thickness and intertube sp.cing of 35, 20, and 35 nm, resp.ctively, were grown; the p.rosity and CdS nanotube density were 36.5% and 2.26 × 10^10 nanotubes/cm^2, resp.ctively. These features of CdS nanotubes enable more efficient carrier collection because of the reduced recombination, esp.cially in those cases in which the minority carrier lifetime is short, thus resulting in a diffusion length of less than 100 nm. Nanotube CdS-CdTe solar cells exhibit a wide and strong sp.ctral resp.nse and quantum efficiency, indicating enhanced light absorp.ion and carrier generation and collection. Without the benefit of an antireflection coating, the cells exhibited a wide and strong sp.ctral resp.nse of quantum efficiency, and a short current density of 25.5 mA/cm^2, an op.n circuit voltage of 750 mV, and a p.wer conversion efficiency of 10.7% under 1-sun illumination. The materials and electro-op.ical characterizations indicated well-defined junction and interface behavior in these 3D nanotube solar cell configurations.

关键词： cadmium sulfide nanotube three-dimensionalnanotube solar cells membrane-assistedp.tterning carrier generation andcollection

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