Lien Der-Hsien, Dong Zhenghong, Retamal Jose Ramon Duran, Wang Hsin-Ping, Wei Tzu-Chiao, Wang Dan, He Jr-Hau, Cui Yi
Electrical Engineering Program, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing, 100190, China.
Adv Mater. 2018 Jul 18:e1801972. doi: 10.1002/adma.201801972.
Optical resonance formed inside a nanocavity resonator can trap light within the active region and hence enhance light absorption, effectively boosting device or material performance in applications of solar cells, photodetectors (PDs), and photocatalysts. Complementing conventional circular and spherical structures, a new type of multishelled spherical resonant strategy is presented. Due to the resonance-enhanced absorption by multiple convex shells, ZnO nanoshell PDs show improved optoelectronic performance and omnidirectional detection of light at different incidence angles and polarization. In addition, the response and recovery speeds of these devices are improved (0.8 and 0.7 ms, respectively) up to three orders of magnitude faster than in previous reports because of the existence of junction barriers between the nanoshells. The general design principles behind these hollow ZnO nanoshells pave a new way to improve the performance of sophisticated nanophotonic devices.
在纳米腔谐振器内部形成的光学共振可以将光捕获在有源区域内，从而增强光吸收，有效地提高太阳能电池、光电探测器（PD）和光催化剂等应用中器件或材料的性能。作为传统圆形和球形结构的补充，提出了一种新型的多壳层球形共振策略。由于多个凸壳的共振增强吸收，ZnO纳米壳PD在不同入射角和偏振下表现出改善的光电性能和全向光检测能力。此外，由于纳米壳之间存在结势垒，这些器件的响应和恢复速度（分别为0.8和0.7毫秒）比以前的报道快了三个数量级。这些空心ZnO纳米壳背后的一般设计原则为改进复杂纳米光子器件的性能开辟了一条新途径。
