期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 11, 页码 4678-4684出版社
AMER CHEMICAL SOC
DOI: 10.1021/am302893r
关键词
silicon nanowire arrays; organic monolayer; surface passivation; hybrid Schottky solar cell; charge recombination
资金
- National Basic Research Program of China (973 Program) [2012CB932402]
- National Natural Science Foundation of China [91123005, 61176057, 61211130358, 60976050]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
We demonstrate a hybrid Schottky junction solar cell based on methyl/allyl groups terminated silicon nanowire arrays (SiNWs) and poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) with a power conversion efficiency (PCE) of 10.2%. The methyl/allyl organic monolayer on silicon Can act as an excellent passivation layer for suppressing surface charge, recombination, which is characterized by grazing angle attenuated total reflectance Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy measurements. The transient and steady electric output characteristics measurements indicate that the density of trap states of SiNWs are dramatically suppressed by methyl/allyl surface modification. In addition, the device based on methyl/allyl passivated SiNWs exhibits improved stable electrical output over those based on either methyl or allyl passivated ones. The improved PCE and good stability of the device are ascribed to efficient functionalization of the SiNW surface.
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