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작성일 : 14-09-29 15:12
Photoelectrochemical water splitting employing a tapered silicon nanohole array
 글쓴이 : 최고관리자
조회 : 5,501  
We demonstrated tapered SiNH photocathodes that increased the effectiveness of photoelectrochemical water splitting. Forming a refractive index gradient and alleviating the refractive index mismatch allowed for the utilization of a thin SiNH array with a depth of only 200 nm for superior light absorbance, such that the undesirable surface recombination loss could be Minimized. The larger bandgap found in the tapered SiNHs was capable of establishing a surface field for further suppression of the recombination loss by enhancing the passivation capability. The enhancement of photovoltage resulted in the anodic shift of the onset potentials. These remarkable advantages of our tapered SiNH array led to a significantly improved PEC performance when compared to planar Si; photocurrent enhancement and a reduced overpotential