The perception of light is crucial for humans to explore the external world.However,challenges of current planar photosensors include inherent limitations in depth of field and field of view.Flexible electronic device...The perception of light is crucial for humans to explore the external world.However,challenges of current planar photosensors include inherent limitations in depth of field and field of view.Flexible electronic devices offer a solution to this issue by allowing adaptation to curved surfaces,ensuring stable interfaces and excellent signal quality.Compared to photoelectric sensors,flexible photosensors based on photothermal conversion can respond to a wider spectrum of light,simplify design processes,and overcome issues such as instability and high toxicity.The review introduces progress on the flexible photosensors based on photothermal conversion,and summarizes the combination of photothermal conversion with pyroelectric,thermoelectric,and thermoresistive effects,allowing for the conversion of light signals into thermal signals and then into electric signals.Additionally,the review outlines the challenges for future research in this field.展开更多
The mixed-dimensional van der Waals （vdW） heterostructure is a promising building block for strained electronics and optoelectronics because it avoids the bond fracture and atomic reconstruction under strain. We pro...The mixed-dimensional van der Waals （vdW） heterostructure is a promising building block for strained electronics and optoelectronics because it avoids the bond fracture and atomic reconstruction under strain. We propose a novel mixed-dimensional vdW heterostructure between two-dimensional graphene and a one-dimensional ZnO nanowire for high-performance photosensing. By utilizing the piezoelectric properties of ZnO, strain modulation was accomplished in the mixed-dimensional vdW heterostructure to optimize the device performance. By combining the ultrahigh electrons transfer speed in graphene and the extremely long life time of holes in ZnO, an outstanding responsivity of 1.87 ×10^5 A/W was achieved. Under a tensile strain of only 0.44% on the ZnO nanowire, the responsivity was enhanced by 26%. A competitive model was proposed, in which the performance enhancement is due to the efficient promotion of the injection of photogenerated electrons from the ZnO into the graphene caused by the strain-induced positive piezopotential. Our study provides a strain-engineering strategy for controlling the behavior of the photocarriers in the mixed-dimensional vdW heterostructure, which can be also applied to other similar systems in the future.展开更多
基金financially supported by the Beijing Natural Science Foundation(No.2242037)the National Natural Science Foundation of China(No.22005336)。
文摘The perception of light is crucial for humans to explore the external world.However,challenges of current planar photosensors include inherent limitations in depth of field and field of view.Flexible electronic devices offer a solution to this issue by allowing adaptation to curved surfaces,ensuring stable interfaces and excellent signal quality.Compared to photoelectric sensors,flexible photosensors based on photothermal conversion can respond to a wider spectrum of light,simplify design processes,and overcome issues such as instability and high toxicity.The review introduces progress on the flexible photosensors based on photothermal conversion,and summarizes the combination of photothermal conversion with pyroelectric,thermoelectric,and thermoresistive effects,allowing for the conversion of light signals into thermal signals and then into electric signals.Additionally,the review outlines the challenges for future research in this field.
基金Acknowledgements This work was supported by the National Basic Research Program of China （No. 2013CB932602）, the National Key Research and Development Program of China （No. 2016YFA0202701）, the Program of Introducing Talents of Discipline to Universities （No. B14003）, National Natural Science Foundation of China （Nos. 51672026, 51602020, 51527802, and 51232001）, China Postdoctoral Science Foundation （Nos. 2015M580981 and 2016T90033）, Beijing Municipal Science ＆ Technology Commission, and the State Key Laboratory for Advanced Metals and Materials （No. 2016Z-06）, and the Fundamental Research Funds for the Central Universities （Nos. FRF-TP-15-075A1, FRF-BR-15-036A, and FRF-AS-15-002）.
文摘The mixed-dimensional van der Waals （vdW） heterostructure is a promising building block for strained electronics and optoelectronics because it avoids the bond fracture and atomic reconstruction under strain. We propose a novel mixed-dimensional vdW heterostructure between two-dimensional graphene and a one-dimensional ZnO nanowire for high-performance photosensing. By utilizing the piezoelectric properties of ZnO, strain modulation was accomplished in the mixed-dimensional vdW heterostructure to optimize the device performance. By combining the ultrahigh electrons transfer speed in graphene and the extremely long life time of holes in ZnO, an outstanding responsivity of 1.87 ×10^5 A/W was achieved. Under a tensile strain of only 0.44% on the ZnO nanowire, the responsivity was enhanced by 26%. A competitive model was proposed, in which the performance enhancement is due to the efficient promotion of the injection of photogenerated electrons from the ZnO into the graphene caused by the strain-induced positive piezopotential. Our study provides a strain-engineering strategy for controlling the behavior of the photocarriers in the mixed-dimensional vdW heterostructure, which can be also applied to other similar systems in the future.
