Moon, Byung Joon Jang, Dawon Yi, Yeonjin Lee, Hyunbok Kim, Sang Jin Oh, Yelin Lee, Sang Hyun Park, Min Lee, Sungho Bae, Sukang 2024-01-20T02:00:21Z 2024-01-20T02:00:21Z 2021-09-01 2017-04 2211-2855 https://pubs.kist.re.kr/handle/201004/122886 The tunable heteroatom doping density in graphene quantum dots (GQDs) can provide unique opportunities for advanced electrochemical and opto-electronic applications with control of intrinsic properties that allow exploiting new phenomena. Herein, we report a facile one-step synthesis of the nitrogen-doped high crystallinity GQDs (nGQDs) from poly-acrylonitrile (PAN)-based CFs using the solvo-thermal cutting method. Interestingly, the optical properties of nGQDs can be simply controlled by varying the heat treatment temperature of the CFs with different N contents. We also conduct an in-depth study on the optical properties of nGQDs according to the variation of N atom density that can be readily modulated by controlling the graphitization temperature of CFs, via both experimental and computational analyses. The synthesized nGQDs are blended with PEDOT:PSS as an anodic buffer layer to induce efficient hole extraction and energy-down-shift in organic photovoltaic (OPV) devices that provide an enhanced power conversion efficiency (PCE) from 7.5% to 8.5%. Because of the wide absorption band, high carrier extraction, and non-toxicity, these nGQDs are demonstrated to be excellent probes for high-performance opto-electronic applications. English ELSEVIER REDUCTION OXIDE PHOTOLUMINESCENT EFFICIENCY CONVERSION FLUORESCENCE IMPROVEMENT ENHANCEMENT ELECTRON SHEETS Multi-functional nitrogen self-doped graphene quantum dots for boosting the photovoltaic performance of BHJ solar cells Article 10.1016/j.nanoen.2017.02.013 1 NANO ENERGY, v.34, pp.36 - 46 NANO ENERGY 34 36 46 scie scopus 000400383300005 2-s2.0-85013168471 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article REDUCTION OXIDE PHOTOLUMINESCENT EFFICIENCY CONVERSION FLUORESCENCE IMPROVEMENT ENHANCEMENT ELECTRON SHEETS PAN fiber Hydrothermal cutting N-doped graphene quantum dot Photoluminescence Hole transport layer