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http://hdl.handle.net/10397/96251
Title: | Omnidirectional harvesting of weak light using a graphene quantum dot-modified organic/silicon hybrid device | Authors: | Tsai, ML Tsai, DS Tang, L Chen, LJ Lau, SP He, JH |
Issue Date: | 23-May-2017 | Source: | ACS nano, 23 May 2017, v. 11, no. 5, p. 4564-4570 | Abstract: | Despite great improvements in traditional inorganic photodetectors and photovoltaics, more progress is needed in the detection/collection of light at low-level conditions. Traditional photodetectors tend to suffer from high noise when operated at room temperature; therefore, these devices require additional cooling systems to detect weak or dim light. Conventional solar cells also face the challenge of poor light-harvesting capabilities in hazy or cloudy weather. The real world features such varying levels of light, which makes it important to develop strategies that allow optical devices to function when conditions are less than optimal. In this work, we report an organic/inorganic hybrid device that consists of graphene quantum dot-modified poly(3,4-ethylenedioxythiophene) polystyrenesulfonate spin-coated on Si for the detection/harvest of weak light. The hybrid configuration provides the device with high responsivity and detectability, omnidirectional light trapping, and fast operation speed. To demonstrate the potential of this hybrid device in real world applications, we measured near-infrared light scattered through human tissue to demonstrate noninvasive oximetric photodetection as well as characterized the device's photovoltaic properties in outdoor (i.e., weather-dependent) and indoor weak light conditions. This organic/inorganic device configuration demonstrates a promising strategy for developing future high-performance low-light compatible photodetectors and photovoltaics. | Keywords: | Graphene quantum dots Hybrid Omnidirectional PEDOT:PSS Weak light |
Publisher: | American Chemical Society | Journal: | ACS nano | ISSN: | 1936-0851 | EISSN: | 1936-086X | DOI: | 10.1021/acsnano.6b08567 | Rights: | © 2017 American Chemical Society This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsnano.6b08567. |
Appears in Collections: | Journal/Magazine Article |
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