Pt/AlGaN Nanoarchitecture: Toward High Responsivity, Self-Powered Ultraviolet-Sensitive Photodetection

Danhao Wang, Xin Liu, Shi Fang, Chen Huang, Yang Kang, Huabin Yu, Zhongling Liu, Haochen Zhang, Ran Long, Yujie Xiong, Yangjian Lin, Yang Yue, Binghui Ge, Tien Khee Ng, Boon S. Ooi, Zetian Mi, Jr-Hau He, Haiding Sun

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Energy-saving photodetectors are the key components in future photonic systems. Particularly, self-powered photoelectrochemical-type photodetectors (PEC–PDs), which depart completely from the classical solid-state junction device, have lately intrigued intensive interest to meet next-generation power-independent and environment-sensitive photodetection. Herein, we construct, for the first time, solar-blind PEC PDs based on self-assembled AlGaN nanostructures on silicon. Importantly, with the proper surface platinum (Pt) decoration, a significant boost of photon responsivity by more than an order of magnitude was achieved in the newly built Pt/AlGaN nanoarchitectures, demonstrating strikingly high responsivity of 45 mA/W and record fast response/recovery time of 47/20 ms without external power source. Such high solar-blind photodetection originates from the unparalleled material quality, fast interfacial kinetics, as well as high carrier separation efficiency which suggests that embracement of defect-free wide-bandgap semiconductor nanostructures with appropriate surface decoration offers an unprecedented opportunity for designing future energy-efficient and large-scale optoelectronic systems on a silicon platform.
Original languageEnglish (US)
JournalNano Letters
DOIs
StatePublished - Dec 15 2020

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