物质非平衡合成与调控教育部重点实验室
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 研究进展
The New Paper of Professor Peidong Yang
发布时间:2011-10-13 11:50:08

NATURE NANOTECHNOLOGY  卷: 6   期: 9   页: 568-572

Solution-processed core–shell nanowires for efficient photovoltaic cells
Jinyao Tang1,3†, Ziyang Huo1,3†, Sarah Brittman1,3, Hanwei Gao1,3 and Peidong Yang1,2,3*

 

Semiconductor nanowires are promising for photovoltaic applications1–11, but, so far, nanowire-based solar cells have had lower efficiencies than planar cells made from the same materials6–10,12,13, even allowing for the generally lower light absorption of nanowires. It is not clear, therefore, if the benefits of the nanowire structure, including better charge collection and transport14 and the possibility of enhanced absorption through light trapping4,15, can outweigh the reductions in performance caused by recombination at the surface of the
nanowires and at p–n junctions. Here, we fabricate core–shell nanowire solar cells with open-circuit voltage and fill factor values superior to those reported for equivalent planar cells, and an energy conversion efficiency of ∼5.4%, which is comparable to that of equivalent planar cells despite low light absorption levels16. The device is made using a low-temperature solution-based cation exchange reaction17–21 that creates a heteroepitaxial junction between a single-crystalline CdS core and single-crystalline Cu2S shell. We integrate multiple
cells on single nanowires in both series and parallel configurations for high output voltages and currents, respectively. The ability to produce efficient nanowire-based solar cells with a solution-based process and Earth-abundant elements22–24 could significantly reduce fabrication costs relative to existing high-temperature bulk
material approaches.




物质非平衡合成与调控教育部重点实验室