Enhancing the Ultraviolet Photocurrent and Response Speed of Zinc Oxide Nanoflowers using Surface Plasmons of Gold Nanoparticles and a Graphene Membrane,Physica Status Solidi-Rapid Research Letters

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Enhancing the Ultraviolet Photocurrent and Response Speed of Zinc Oxide Nanoflowers using Surface Plasmons of Gold Nanoparticles and a Graphene Membrane
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-02-08 , DOI: 10.1002/pssr.202000512
Yunfei Zhao ₁ , Hainan Zhang ₁ , Xiaoming Wu ₁ , Yi Yang ₁ , Tian-Ling Ren ₁

Affiliation

The enhancement effect of the plasmonic resonance of AuNPs and a graphene membrane on the optoelectronic properties of ZnO nanoflowers is investigated. A layered structure is fabricated, consisting of ZnO nanoflowers grown on a conductive fluorine‐doped tin oxide (FTO) glass substrate, decorated with gold nanoparticles, and covered by a multilayer graphene membrane. An excellent photocurrent response as high as 1650 A W⁻¹ and a millisecond level response time are achieved. Compared with the pristine ZnO device, which has a responsivity of 2.98 A W⁻¹ and a response time of tens of seconds, the photocurrent response is dramatically increased by 500‐fold and the response time is decreased by over 1000‐fold. The significant enhancement of the photocurrent can be attributed to the coupling of plasmonic resonance modes of AuNPs and the graphene membrane, according to finite‐difference time‐domain simulation results; whereas the tremendous improvement on response time can be attributed to the high electron mobility of graphene. The work is essential for further study of the plasmonic enhancement of ZnO optoelectronic performance and provides a new path for the fabrication of ZnO‐based high‐responsivity, high‐speed, and low‐cost ultraviolet emission and detection devices.

中文翻译：

使用金纳米粒子和石墨烯膜的表面等离激元提高紫外光氧化锌纳米花的光电流和响应速度

研究了金纳米粒子和石墨烯膜的等离子体共振对ZnO纳米花光电性能的增强作用。制成了一个分层结构，该结构由生长在导电氟掺杂氧化锡（FTO）玻璃基板上的ZnO纳米花组成，并用金纳米颗粒装饰，并覆盖有多层石墨烯膜。获得了高达1650 A W ^-1的出色光电流响应和毫秒级的响应时间。与原始ZnO器件相比，其响应度为2.98 A W ^-1响应时间为数十秒，光电流响应显着增加了500倍，响应时间减少了1000倍以上。根据有限差分时域仿真结果，光电流的显着增强可归因于AuNPs和石墨烯膜的等离振子共振模式的耦合。而响应时间的极大改善可归因于石墨烯的高电子迁移率。这项工作对于进一步研究ZnO光电性能的等离子体增强是必不可少的，并为制造基于ZnO的高响应性，高速和低成本的紫外线发射和检测设备提供了一条新途径。

更新日期：2021-04-08

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