Article
Full-space potential gradient driven charge migration inside BiFeO₃ Photocathode
Author/s | Tan, Bing
Reyes, Abdul M. Menéndez-Proupin, Eduardo Reyes-Lillo, Sebastián E. Li, Yanbo Zhang, Zemin |
Department | Universidad de Sevilla. Departamento de Física Aplicada I |
Publication Date | 2022-09 |
Deposit Date | 2024-04-23 |
Abstract | Solar–fuel conversion depends on effective collection of photocarriers in the photoelectrode. In practice, however, considerable photocarriers are lost in the bulk through recombination due to the absence of a driving ... Solar–fuel conversion depends on effective collection of photocarriers in the photoelectrode. In practice, however, considerable photocarriers are lost in the bulk through recombination due to the absence of a driving force. To overcome this, herein, a full-space electric field is induced in BiFeO₃ photocathodes by building a gradient homojunction through Fermi level engineering. As expected, the BiFeO₃ photocathodes with forward electric field show significantly enhanced performance: a state-of-the-art photocurrent of −1.02 mA·cm⁻² at 0.5 V vs RHE and H₂O₂ production of 380 mmol·(L·m²)⁻¹ within 50 min. First-principles calculations and experimental analysis suggest that the Bi vacancies as shallow acceptors can significantly modulate the Fermi level of BiFeO₃. The resulting internal electric field serves as an additional driving force to promote charge collection. This work provides an approach to induce a full-space electric field in semiconductor films through gradient defects modulation, which can be broadly applied to other optoelectronic systems. |
Funding agencies | Fondo Nacional de Desarrollo Científico y Tecnológico, Fondecyt. Chile Laboratorio Nacional de Computación de Alto Rendimiento (NLHPC). Chile |
Project ID. | ANID FONDECYT 1220986
NLHPC ECM-02 |
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AM_AIMS_2.pdf | 129.9Kb | [PDF] | View/ | |
ACSEL_menendez-proupin_2022_fu ... | 4.583Mb | [PDF] | View/ | |