Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
J Colloid Interface Sci. 2018 Aug 1;523:245-253. doi: 10.1016/j.jcis.2018.03.110. Epub 2018 Mar 31.
In the present scenario of energy crisis, it is inevitable to focus on the low powered or self-powered devices. Multi-spectral photoresponse is an additional advantage to the above feature. We have developed an efficient self-powered photodetector with broad wavelength detection range based on heterostructures of two wide band-gap materials ZnO and ZnS. More than two orders higher responsivity and 'ON/OFF' ratio has been observed in case of heterostructure sample as compared to pristine ZnO. On the basis of the controlled experimental results, it has been established that the interfacial surface engineering, can be useful to improve the visible response and a significant photovoltaic performance under visible light illumination can be achieved. Unlike the other recent reports on self-powered UV-visible photodetector, we have achieved two order higher visible response without compromising the UV photoresponse. Unprecedented broad wavelength photodetection in self-powered mode in the present study highlights the uniqueness and advantage of an interface in a core-shell heterostructure for photodetection applications.
在当前的能源危机情况下，关注低功率或自供电设备是不可避免的。多光谱光响应是上述特性的额外优势。我们已经基于两种宽带隙材料 ZnO 和 ZnS 的异质结构，开发了一种具有宽波长检测范围的高效自供电光电探测器。与原始 ZnO 相比，异质结构样品的响应率和“开/关”比值高出两个数量级以上。根据受控实验结果，已经确定界面表面工程可用于改善可见光响应，并且可以在可见光照射下实现显著的光伏性能。与其他最近关于自供电紫外-可见光电探测器的报告不同，我们在不影响紫外光响应的情况下实现了两个数量级更高的可见光响应。本研究中在自供电模式下实现的前所未有的宽波长光电探测突出了核壳异质结构中界面在光电探测应用中的独特性和优势。
