期刊
JOURNAL OF POWER SOURCES
卷 473, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228580
关键词
Si photocathodes; Photoelectrochemical response; Controllable nanowires; Size influence; Carrier collection
资金
- National Natural Science Foundation of China [61675142, 61875143]
- Natural Science Foundation of Jiangsu Province [BK20181169, BK20180042]
- China Postdoctoral Science Foundation [2017M611898, 2018T110549]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJA480004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions of Jiangsu Higher Education Institutions
For photoelectrochemical (PEC) photoelectrodes composed by semiconductor wire arrays, the precisely designed wires play a crucial role in regulating the photoelectrochemical performances; however, an experimental evaluation of the size effect for high PEC performances relies on a controllable fabrication of the wires by preferentially the cost-effective and large-area method. Here, the fabrication of large-area and homogeneous silicon wire arrays with a good size controllability is realized by using the nanosphere lithography, inductively coupled plasma-reactive ion etching, and metal-catalyzed electroless etching. It is verified that the effects of the wire length/diameter on the PEC responses and carrier collection can be completely different for the PEC systems with or without surface passivation. Compared to the case with a relative-small length, the silicon wire array photocathode with a relative-large length shows the inferior (superior) PEC performances before (after) surface passivation (e.g., the saturated photocurrent density under AM 1.5G irradiation is significantly improved from 18.2 to 35.6 mA cm(-2)); moreover, a substantial anodical shift of the onset potential up to 0.95 V is realized for only increasing the wire diameter. The underlying mechanisms are revealed through analyzing the optical absorption, surface recombination, surface catalytic activity, and spatial flux density of the photogenerated carriers.
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