All‐Solution‐Processed Metal Oxide/Chalcogenide Hybrid Full‐Color Phototransistors with Multistacked Functional Layers and Composition‐Gradient Heterointerface. Issue 17 (25th June 2018)

• Record Type: Journal Article
• Authors: Cho, Sung Woon; Kim, Young Been; Jung, Sung Hyun; Baek, Seung Ki; Kim, Joo Sung; Lee, Minkyung; Cho, Hyung Koun; Kim, Yong‐Hoon
• Is Part Of: Advanced optical materials. Volume 6:Issue 17(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-25
• Subjects: chalcogenide semiconductors -- dynamic photoresponse -- hybrid structures -- metal oxides -- phototransistors -- solution‐process -- visible‐light sensing; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201800196
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: 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. Abstract : All‐solution‐processed metal oxide/chalcogenide hybrid visible‐light phototransistor with multistacked functional layers and defect‐suppressed composition‐gradient heterointerface is proposed for cost‐efficient, ultrasensitive, fast dynamic, and full‐color photodetection system. Such all‐solution‐processed zinc tin oxide (ZTO)/CdS/ZTO hybrid structure phototransistor achieves reproducible/repeatable real‐time full‐color photosensing with high photosensitivity and instant dynamic phototransient behavior under dynamic stimulus of primary colors.