共 46 条
Nanostructured p-n Junctions for Kinetic-to-Electrical Energy Conversion
被引:97
作者:
Briscoe, Joe
[1
]
Stewart, Mark
[2
]
Vopson, Melvin
[2
]
Cain, Markys
[2
]
Weaver, Paul M.
[2
]
Dunn, Steve
[1
]
机构:
[1] Queen Mary Univ London, Sch Engn & Mat Sci, Ctr Mat Res, London E1 4NS, England
[2] Natl Phys Lab, Teddington TW11 0LW, Middx, England
基金:
英国工程与自然科学研究理事会;
关键词:
energy harvesting;
hybrid;
p-n junctions;
piezoelectrics;
zinc oxide;
DEPOLARIZATION-FIELD;
ZNO;
POLARIZATION;
COMPLEX;
SYSTEM;
CHARGE;
FILMS;
D O I:
10.1002/aenm.201200205
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Piezoelectric ZnO nanorods grown on a flexible substrate are combined with the p-type semiconducting polymer PEDOT:PSS to produce a p-n junction device that successfully demonstrates kinetic-to-electrical energy conversion. Both the voltage and current output of the devices are measured to be in the range of 10 mV and 10 mu A cm-2. Combining these figures for the best device gives a maximum possible power density of 0.4 mW cm-3. Systematic testing of the devices is performed showing that the voltage output increases linearly with applied stress, and is reduced significantly by illumination with super-band gap light. This provides strong evidence that the voltage output results from piezoelectric effects in the ZnO. The behavior of the devices is explained by considering the time-dependent changes in band structure resulting from the straining of a piezoelectric material within a p-n junction. It is shown that the rate of screening of the depolarisation field determines the power output of a piezoelectric energy harvesting device. This model is consistent with the behavior of a number of previous devices utilising the piezoelectric effect in ZnO.
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页码:1261 / 1268
页数:8
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