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Morphology Effect of 1D ZnO Nanostructures Designed by Hydrothermal and Thermal Annealing for Fast Ultraviolet Photodetector Applications
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-04-21 , DOI: 10.1002/pssa.201900946 Dongwan Kim 1 , Jae-Young Leem 1
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-04-21 , DOI: 10.1002/pssa.201900946 Dongwan Kim 1 , Jae-Young Leem 1
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ZnO nanorods are grown on a ZnO seed layer using the hydrothermal method and subsequently annealed at temperatures of 400–800 °C. The ZnO nanorods annealed at 400 °C exhibit a morphology similar to that of the unannealed ZnO nanorods. However, the tips of the ZnO nanorods gradually become rounded and their density and diameter increase with an increase in the annealing temperature. The intensity of the near‐band‐edge emission increases gradually with an increase in the annealing temperature from 400 to 600 °C but decreases sharply in the case of nanorods annealed at 800 °C. With respect to the deep‐level emissions, broad yellow, orange, and green emissions are observed. Further, the low‐temperature photoluminescence spectrum measured at 12 K of the ZnO nanorods annealed at 600 °C contains a donor‐bound exciton emission, as well as emissions related to the donor–acceptor pair (DAP) transition and the first‐order and second‐order longitudinal optical phonon replicas of the DAP transition. Finally, with respect to the photoresponse, the dark current and photocurrent of the nanorods decrease and their photosensitivity increases with the increase in the annealing temperature.
中文翻译：
水热和热退火设计的一维ZnO纳米结构在快速紫外光电探测器中的形貌效应
使用水热法将ZnO纳米棒生长在ZnO种子层上，然后在400–800°C的温度下进行退火。在400°C退火的ZnO纳米棒的形态类似于未退火的ZnO纳米棒。但是，随着退火温度的升高，ZnO纳米棒的尖端逐渐变圆，并且其密度和直径增大。随着退火温度从400升高到600°C，近带边缘发射的强度逐渐增加，但在800°C退火的纳米棒的情况下，近带边缘发射的强度急剧降低。关于深层排放，观察到宽泛的黄色，橙色和绿色排放。此外，在600°C退火的ZnO纳米棒的12 K下测得的低温光致发光光谱包含供体结合的激子发射，以及与供体-受体对（DAP）过渡以及DAP过渡的一阶和二阶纵向光学声子副本相关的发射。最后，关于光响应，随着退火温度的升高，纳米棒的暗电流和光电流减小，并且它们的光敏性增加。
更新日期：2020-06-18
中文翻译：
水热和热退火设计的一维ZnO纳米结构在快速紫外光电探测器中的形貌效应
使用水热法将ZnO纳米棒生长在ZnO种子层上，然后在400–800°C的温度下进行退火。在400°C退火的ZnO纳米棒的形态类似于未退火的ZnO纳米棒。但是，随着退火温度的升高，ZnO纳米棒的尖端逐渐变圆，并且其密度和直径增大。随着退火温度从400升高到600°C，近带边缘发射的强度逐渐增加，但在800°C退火的纳米棒的情况下，近带边缘发射的强度急剧降低。关于深层排放，观察到宽泛的黄色，橙色和绿色排放。此外，在600°C退火的ZnO纳米棒的12 K下测得的低温光致发光光谱包含供体结合的激子发射，以及与供体-受体对（DAP）过渡以及DAP过渡的一阶和二阶纵向光学声子副本相关的发射。最后，关于光响应，随着退火温度的升高，纳米棒的暗电流和光电流减小，并且它们的光敏性增加。
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