材料科学
光电子学
半导体
带隙
兴奋剂
钝化
纳米技术
量子隧道
光电流
欧姆接触
量子效率
光电化学
量子点
图层(电子)
电极
化学
电化学
物理化学
作者
Yang Li,Xianying Dai,Yuyu Bu,Hanzhi Zhang,Jie Liu,Wenyu Yuan,Xiaohui Guo,Jin-Ping Ao
出处
期刊:Small
[Wiley]
日期:2022-04-01
卷期号:18 (21): 2200454-2200454
被引量:10
标识
DOI:10.1002/smll.202200454
摘要
Surface passivation of the photoelectrode by wide bandgap semiconductor quantum layer is an important strategy to improve work stability and surface state inhibition. However, an inevitable energy barrier is generated during the quantum tunneling process of the photocarriers. To overcome this shortage, a tandem photo-generated hole transfer route is fabricated on BiVO4 photoanode by doped dual-quantum layers modification, Ni-ZnO (5 nm) and Rh-SrTiO3 (≈10 nm). Modulated photoelectrochemical (PEC), Scanning Kelvin Probe (SKP), and DFT calculation method results indicate that a tandem hole ohmic contact route is formed in the photoanode to reduce the quantum tunneling energy barrier, meanwhile, the photon absorption capacity of BiVO4 is improved after doped quantum layers modification. Both a phenomenal attribute to the energy band hybridization between Ni, Rh 3d orbits in quantum layers with BiVO4 photoanode. Then, the modified BiVO4 photoanode achieves the recoded photocurrent density of 6.47 and 5.18 mA cm-2 (Na2 SO3 electrolyte, VRHE = 1.23 V) under simulated sun light (100 mW cm-2 AM 1.5 G) by xenon lamp illumination without and with UV composition cutting down to ≈5%, respectively. Generally, this work will highlight a potential application in the fields of PEC water splitting and photovoltaic conversion for various semiconductor nanomaterials.
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