Low Dark-Current, High Current-Gain of PVK/ZnO Nanoparticles Composite-Based UV Photodetector by PN-Heterojunction Control

We propose a solution-processable ultraviolet (UV) photodetector with a pn-heterojunction hybrid photoactive layer (HPL) that is composed of poly-n-vinylcarbazole (PVK) as a p-type polymer and ZnO nanoparticles (NPs) as an n-type metal oxide. To observe the effective photo-inducing ability of the UV...

Full description

Saved in:
Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2016-01, Vol.16 (1), p.74-74
Main Authors: Lee, Sang-Won, Cha, Seung-Hwan, Choi, Kyung-Jae, Kang, Byoung-Ho, Lee, Jae-Sung, Kim, Sae-Wan, Kim, Ju-Seong, Jeong, Hyun-Min, Gopalan, Sai-Anand, Kwon, Dae-Hyuk, Kang, Shin-Won
Format: Article
Language:English
Subjects:
Composite materials
Doping
Engineering
Glass substrates
hybrid photoactive layer
Metal Nanoparticles - chemistry
Metal oxides
Nanocomposites - chemistry
Nanoparticles
Optical properties
Photochemical Processes
Photocurrent
Photodetectors
Photoelectric effect
pn-heterojunction
Polymers
Polyvinyl carbazole
Polyvinyls - chemistry
Sensors
Spectrophotometry, Ultraviolet
UV photodetector
Zinc oxide
Zinc Oxide - chemistry
ZnO nanoparticles
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We propose a solution-processable ultraviolet (UV) photodetector with a pn-heterojunction hybrid photoactive layer (HPL) that is composed of poly-n-vinylcarbazole (PVK) as a p-type polymer and ZnO nanoparticles (NPs) as an n-type metal oxide. To observe the effective photo-inducing ability of the UV photodetector, we analyzed the optical and electrical properties of HPL which is controlled by the doping concentration of n-type ZnO NPs in PVK matrix. Additionally, we confirmed that the optical properties of HPL dominantly depend on the ZnO NPs from the UV-vis absorption and the photoluminescence (PL) spectral measurements. This HPL can induce efficient charge transfer in the localized narrow pn-heterojunction domain and increases the photocurrent gain. It is essential that proper doping concentration of n-type ZnO NPs in polymer matrix is obtained to improve the performance of the UV photodetector. When the ZnO NPs are doped with the optimized concentration of 3.4 wt.%, the electrical properties of the photocurrent are significantly increased. The ratio of the photocurrent was approximately 10³ higher than that of the dark current.
ISSN:1424-8220
1424-8220
DOI:10.3390/s16010074