Photoresponse from single upright-standing ZnO nanorods explored by photoconductive AFM.
作者： Igor Beinik , Markus Kratzer , Astrid Wachauer , Lin Wang , Yuri P Piryatinski
DOI: 10.3762/BJNANO.4.21
关键词: Photoluminescence 、 Photoconductive atomic force microscopy 、 Photoconductivity 、 Photoexcitation 、 Photocurrent 、 Spectroscopy 、 Nanorod 、 Materials science 、 Optoelectronics 、 Charge carrier
摘要: Background: ZnO nanostructures are promising candidates for the development of novel electronic devices due to their unique electrical and optical properties. Here, photoconductive atomic force microscopy (PC-AFM) has been applied investigate transient photoconductivity photocurrent spectra upright-standing nanorods (NRs). With a view evaluate properties NRs get information on recombination kinetics, we have also performed time-resolved photoluminescence measurements macroscopically. Results: Persistent from single was observed about 1800 s studied with help spectroscopy, which recorded locally. The revealed that minimum photon energy sufficient excitation is 3.1 eV. This value at least 100 meV lower than band-gap determined experiments. Conclusion: obtained results suggest photoresponse in under ambient conditions originates preferentially photoexcitation charge carriers localized defect states dominates over oxygen photodesorption mechanism. Our findings agreement previous theoretical predictions based density functional theory calculations as well earlier experiments carried out variable pressure.
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