BiVO₄/WO₃/SnO₂ Double-Heterojunction Photoanode with Enhanced Charge Separation and Visible-Transparency for Bias-Free Solar Water-Splitting with a Perovskite Solar Cell
- Authors
- Baek, Ji Hyun; Kim, Byeong Jo; Han, Gill Sang; Hwang, Sung Won; Kim, Dong Rip; Cho, In Sun; Jung, Hyun Suk
- Issue Date
- Jan-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- double-heterojunction photoanode; BiVO₄/WO₃/SnO₂; charge transport; transmittance; tandem PEC device
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.2, pp.1479 - 1487
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 2
- Start Page
- 1479
- End Page
- 1487
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/21254
- DOI
- 10.1021/acsami.6b12782
- ISSN
- 1944-8244
- Abstract
- Coupling dissimilar oxides in heterostruetures allows the engineering of interfacial, optical, charge separation/transport and transfer properties of photoanodes for photo electrochemical (PEC) water splitting. Here, we demonstrate a double-heterojunction concept based on a BiVO₄/WO₃/SnO₂ triple-layer planar heterojunction (TPH) photoanode, which shows simultaneous improvements in the charge transport (similar to 93% at 1.23 V vs RHE) and transmittance at-longer wavelengths (>500 nm). The TPH photoanode was prepared by a facile solution method: a porous SnO₂ film was, first deposited on a fluorine-doped tin oxide (FTO)/glass-substrate followed by WO₃ deposition, leading to the formation of a double layer of dense WO₃ and a WO₃/SnO₂ mixture at the bottom. Subsequently, a BiVO₄ nanoparticle film was deposited by spin coating. Importantly, the WO₃/(WO₃+SnO₂) composite bottom layer forms a disordered heterojunction enabling intimate contact, lower interfacial resistance, and efficient charge transport/transfer. In addition, the top BiVO₄/WO₃ heterojunction layer improves light absorption and charge separation. The resultant TPH photoanode shows greatly improved internal quantum efficiency (similar to 80%) and PEC water oxidation performance, (similar to 3.1 mA/cm(2) at 1.23 V vs RHE) compared to the previously reported BiVO₄/WO₃ photoanodes. The PEC performance was , further improved by a reactive-ion etching treatment and CoOx electrocatalyst deposition. Finally, we demonstrated a bias-free and stable solar water-splitting by constructing a tandem PEC device with a perovskite solar cell (STH similar to 3.5%).
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