Preparation and employment of carbon nanodots to improve electron extraction capacity of polyethylenimine interfacial layer for polymer solar cells |
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| Affiliation: | 1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin Universeity, 2699 Qianjin Street, Changchun 130012, China;2. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China;1. Department of Mechanical Engineering, Baylor University, Waco, TX 76798, USA;2. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;1. Department of Functional Materials Science, Saitama University, Saitama, 338-8570, Japan;2. Department of Materials Science and Engineering, Iwate University, Morioka, 020-8551, Japan;3. CERMAV-CNRS, UPR5301 & Grenoble Alpes University, 601 rue de la Chimie, BP53 38041 Grenoble, Cedex 9, France;1. Department of Advanced Materials Science & Engineering, Hanseo University, Seosan, Chungnam 356-706, Republic of Korea;2. Korea Institutes of Ceramic Engineering and Technology, Soho-ro, Jinju-Si, Gyeongsangnam-do, Republic of Korea;3. Decontamination & Decommissing Research Division, Korean Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600, Republic of Korea;1. Institute of Nanomaterial & Nanostructure, Changsha University of Science and Technology, Changsha 410114, China;2. College of Engineering and Applied Science, University of Wisconsin Milwaukee, Wisconsin 53211, USA;1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;1. School of Semiconductor and Chemical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Republic of Korea;2. School of Chemical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Republic of Korea |
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| Abstract: | The performance of polymer solar cells is substantially enhanced by introducing carbon nanodots as additives in polyethylenimine buffer layer. The most pronounced effect is observed in one type of device with the average power conversion efficiencies increased from 5.78% to 7.56% after the addition of carbon nanodots at an optimal concentration in the interfacial layer, which is mainly attributed to the enhanced light trapping and electron transfer in the devices. Besides the light-harvesting and electron transport capacity improvement, the addition of carbon nanodots can also increase exciton generation and dissociation, leading to a high electron mobility. This study demonstrates a facile approach for enhancing the efficiencies of polymer solar cells. |
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| Keywords: | Carbon nanodots Polymer solar cells Electron extraction capacity Charge mobility |
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