Journal
NANO LETTERS
Volume 17, Issue 7, Pages 4240-4247Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01154
Keywords
Silicon nanowires; organic/inorganic hybrid solar cells; supercapacitors; integrated self-charging power unit
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Funding
- National Key Research and Development Program of China [2016YFA0202402]
- Thousands Talents Program for Pioneer Researcher and His Innovation Team
- National Natural Science Foundation of China [61674108, 91333208]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Chinese Scholars Council
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An integrated self-charging power unit, combining a hybrid silicon nanowire/polymer heterojunction solar cell with a polypyrrole-based supercapacitor, has been demonstrated to simultaneously harvest solar energy and store it. By efficiency enhancement of the hybrid nanowire solar cells and a dual-functional titanium film serving as conjunct electrode of the solar cell and supercapacitor, the integrated system is able to yield a total photoelectric conversion to storage efficiency of 10.5%, which is the record value in all the integrated solar energy conversion and storage system. This system may not only serve as a buffer that diminishes the solar power fluctuations from light intensity, but also pave its way toward cost-effective high efficiency self-charging power unit. Finally, an integrated device based on ultrathin Si substrate is demonstrated to expand its feasibility and potential application in flexible energy conversion and storage devices.
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