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All‐Solution‐Processed Metal Oxide/Chalcogenide Hybrid Full‐Color Phototransistors with Multistacked Functional Layers and Composition‐Gradient Heterointerface
Author(s) -
Cho Sung Woon,
Kim Young Been,
Jung Sung Hyun,
Baek Seung Ki,
Kim Joo Sung,
Lee Minkyung,
Cho Hyung Koun,
Kim YongHoon
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800196
Subject(s) - materials science , photodiode , chalcogenide , photosensitivity , optoelectronics , passivation , photodetection , oxide , photocurrent , semiconductor , amorphous solid , photodetector , nanotechnology , layer (electronics) , chemistry , organic chemistry , metallurgy
For the development of cost‐effective, ultrasensitive, fast dynamic, and full‐color photodetection platforms, an all‐solution‐processed metal oxide/chalcogenide semiconductor hybrid‐structure‐based visible‐light phototransistor with (i) multistacked functional materials, (ii) a chemically stable solution‐based construction, and (iii) defect‐suppressed composition‐gradient heterointerfaces is proposed. Herein, the functional multistacked structure (a‐ZTO/cc‐CdS/a‐ZTO) consists of high‐mobility amorphous zinc tin oxide (ZTO) (a‐ZTO bottom), a high‐efficiency coarsened crystalline CdS (cc‐CdS) visible‐light absorber, and defective surface passivation a‐ZTO (top) to boost photosensitivity via efficient generation/transport and spontaneous separation/confinement of photocarriers. Chemically stable solution‐based multistacking is achieved via careful choice of chemically durable oxide and chalcogenide semiconductors (Sn‐eqi ZTO and CdS). The composition‐gradient heterointerfaces formed near ZTO/CdS and CdS/ZTO junctions via thermally activated healing processes provide instantaneous photoresponse and full‐color sensing performance. Finally, the all‐solution‐processed a‐ZTO/cc‐CdS/a‐ZTO hybrid phototransistor achieves repeatable/reproducible real‐time full‐color detection with high photosensitivity, fast phototransient speeds, and no persistent photocurrent behavior under dynamic stimulus using primary colors. It is believed that the all‐solution processed oxide/chalcogenide hybrid phototransistor with multistacked functional materials and composition‐gradient heterointerfaces will facilitate the development of cost‐efficient, ultrasensitive, fast dynamic, and full‐color visible‐light detection system.