Sensitive, High-Speed, and Broadband Perovskite Photodetectors with Built-In TiO2 Metalenses

Xiao，Ting1; Zhao，Jie2,3; Sun，Peng2,4; Li，Peng1; Zhang，Yaokang1; Zhao，Ni6; Ren，Zhiwei7; Li，Gang7,8; Huang，Zhifeng2,5; Zheng，Zijian1,8

2021

10.1002/smll.202102694

Small   影响因子和分区

1613-6810

1613-6829

Monolithic integration of nanostructured metalenses with broadband light transmission and good charge transport can simultaneously enhance the sensitivity, speed, and efficiency of photodetectors. The realization of built-in broadband metalenses in perovskite photodetectors, however, has been largely challenged by the limited choice of materials and the difficulty in nanofabrication. Here a new type of broadband-transmitting built-in TiO metalens (meta-TiO) is devised, which is readily fabricated by one-step and lithograph-free glancing angle deposition. The meta-TiO, which comprises of sub-100 nm TiO nanopillars randomly spaced with a wide range of sub-wavelength distances in 5–200 nm, shows high transmittance of light in the wavelength range of 400–800 nm. The meta-TiO also serves as an efficient electron transporting layer to prevent the exciton recombination and facilitate the photoinduced electron extraction and transport. Replacing the conventional mesoporous TiO with the meta-TiO comprehensively leads to enhancing the detection speed by three orders of magnitude to a few hundred nanoseconds, improving the responsivity and detectivity by one order of magnitude to 0.5 A W and 10 Jones, respectively, and extending the linear dynamic range by 50% to 120 dB.

glancing angle deposition metalens perovskite photodetectors TiO 2

SCI ; EI

英语

其他

WOS:000695063500001

20213710888255

Light transmission ; Metals ; Nanopillars ; Perovskite ; Photodetectors ; Photons

Minerals:482.2 ; Light/Optics:741.1 ; Inorganic Compounds:804.2 ; Atomic and Molecular Physics:931.3

2-s2.0-85114673995

Scopus

1.Laboratory for Advanced Interfacial Materials and Devices,Research Centre for Smart Wearable Technology,Institute of Textiles and Clothing,The Hong Kong Polytechnic University,Hong Kong
2.Department of Physics,Hong Kong Baptist University,Hong Kong
3.School of Energy,Soochow Institute for Energy and Materials Innovations & Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province,Soochow University,Suzhou,215006,China
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.Institute of Advanced Materials,State Key Laboratory of Environmental and Biological Analysis,Golden Meditech Centre for NeuroRegeneration Sciences,Hong Kong Baptist University,Hong Kong
6.Department of Electronic Engineering,The Chinese University of Hong Kong,Hong Kong
7.Department of Electronic and Information Engineering,The Hong Kong Polytechnic University,Hong Kong
8.Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong

Xiao，Ting,Zhao，Jie,Sun，Peng,et al. Sensitive, High-Speed, and Broadband Perovskite Photodetectors with Built-In TiO2 Metalenses[J]. Small,2021,17.

Xiao，Ting.,Zhao，Jie.,Sun，Peng.,Li，Peng.,Zhang，Yaokang.,...&Zheng，Zijian.(2021).Sensitive, High-Speed, and Broadband Perovskite Photodetectors with Built-In TiO2 Metalenses.Small,17.

Xiao，Ting,et al."Sensitive, High-Speed, and Broadband Perovskite Photodetectors with Built-In TiO2 Metalenses".Small 17(2021).