Photoinduced charge transfer in ZnO/Cu2O heterostructure films studied by surface photovoltage technique

Literature Information

Publication Date 2010-10-25
DOI 10.1039/C0CP01228A
Impact Factor 3.676
Authors

Tengfei Jiang, Tengfeng Xie, Yu Zhang, Liping Chen, Linlin Peng, Haiyan Li, Dejun Wang


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Abstract

ZnO/Cu2O heterostructure films were prepared by a two-step electrodeposition method in aqueous solution on fluorine-doped tin oxide (FTO) substrates. Scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and UV-vis transmission measurements were utilized to characterize the films. Surface photovoltage (SPV) technique was used to investigate the process of photoinduced charge transfer. The results show that there is an electric field located at the interface between ZnO and Cu2O film and the photoinduced electrons in Cu2O film inject into ZnO under the effect of interfacial electric field with visible light irradiation. While under ultraviolet light illumination, the photoinduced electrons in Cu2O film accumulate at the surface of Cu2O film instead of injecting into ZnO under the action of surface built-in electric field of Cu2O film. The work function measurements confirm that the direction of interfacial electric field is from ZnO to Cu2O. These results are help to future design of high performance heterostructure photovoltaic devices.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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