Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, 721302, India.
Nanoscale. 2018 Oct 18;10(40):19203-19211. doi: 10.1039/c8nr07091a.
We have studied the piezo-phototronic induced enhancement in the photo-response of CdS/ZnO heterojunctions attached with plasmonic Au nanoparticle loaded 2D-graphitic carbon nitride (g-C3N4). The hybrid g-C3N4/CdS/ZnO heterojunction favours the charge carrier separation through the formation of a step-like band alignment. Furthermore, the integration of plasmonic Au loaded g-C3N4 nanosheets on the conventional CdS/ZnO heterojunction facilitates improved visible light absorption properties. The heterojunction device on a flexible platform under the application of a strain (∼0.017%) exhibits ∼102 times higher photoresponse over the control sample at a constant bias of ∼2 V. The variation in the photo-response under different bending conditions has been explained in terms of the improved charge transport through the modified energy bands at the interface of ZnO. The improved piezo-phototronic properties originated from the plasmonic properties of Au loaded g-C3N4 and the piezoelectric characteristics of c-axis oriented ZnO films may be used for future flexible photonic devices.
我们研究了附着有等离子体 Au 纳米颗粒负载的二维石墨相氮化碳（g-C3N4）的 CdS/ZnO 异质结的压光电致增强光响应。混合 g-C3N4/CdS/ZnO 异质结通过形成阶跃能带排列有利于载流子分离。此外，将等离子体 Au 负载的 g-C3N4 纳米片集成到传统的 CdS/ZnO 异质结上，可改善可见光吸收性能。在应变（约 0.017%）下的柔性平台上的异质结器件在恒定偏压（约 2 V）下表现出比对照样品高约 102 倍的光响应。不同弯曲条件下光响应的变化可以根据 ZnO 界面处能带的修改来解释，这改善了电荷输运。源于 Au 负载 g-C3N4 的等离子体特性和 c 轴取向 ZnO 薄膜的压电特性的压光电致性能可用于未来的柔性光子器件。
