光电流
材料科学
钝化
非晶硅
硅
原子层沉积
分解水
能量转换效率
电解质
光电子学
无定形固体
化学工程
图层(电子)
纳米技术
电极
光电化学电池
晶体硅
化学
催化作用
有机化学
物理化学
工程类
光催化
生物化学
作者
Yanhao Yu,Zheng Zhang,Xin Yin,A. Kvit,Qingliang Liao,Zhuo Kang,Xiaoqin Yan,Xudong Wang
出处
期刊:Nature Energy
[Springer Nature]
日期:2017-03-27
卷期号:2 (6)
被引量:218
标识
DOI:10.1038/nenergy.2017.45
摘要
Black silicon (b-Si) is a surface-nanostructured Si with extremely efficient light absorption capability and is therefore of interest for solar energy conversion. However, intense charge recombination and low electrochemical stability limit the use of b-Si in photoelectrochemical solar-fuel production. Here we report that a conformal, ultrathin, amorphous TiO2 film deposited by low-temperature atomic layer deposition (ALD) on top of b-Si can simultaneously address both of these issues. Combined with a Co(OH)2 thin film as the oxygen evolution catalyst, this b-Si/TiO2/Co(OH)2 heterostructured photoanode was able to produce a saturated photocurrent density of 32.3 mA cm−2 at an external potential of 1.48 V versus reversible reference electrode (RHE) in 1 M NaOH electrolyte. The enhanced photocurrent relative to planar Si and unprotected b-Si photoelectrodes was attributed to the enhanced charge separation efficiency as a result of the effective passivation of defective sites on the b-Si surface. The 8-nm ALD TiO2 layer extends the operational lifetime of b-Si from less than half an hour to four hours. Nanostructured black silicon can be used as a photoelectrode for solar-driven water splitting, but its high surface area can increase charge recombination and accelerate corrosion. Here the authors show that a thin, conformal film of TiO2 can increase both the photocurrent and the stability of black silicon.
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