Multi-functional nitrogen self-doped graphene quantum dots for boosting the photovoltaic performance of BHJ solar cells
- Authors
- Moon, Byung Joon; Jang, Dawon; Yi, Yeonjin; Lee, Hyunbok; Kim, Sang Jin; Oh, Yelin; Lee, Sang Hyun; Park, Min; Lee, Sungho; Bae, Sukang
- Issue Date
- 2017-04
- Publisher
- ELSEVIER
- Citation
- NANO ENERGY, v.34, pp.36 - 46
- Abstract
- 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.
- Keywords
- REDUCTION; OXIDE; PHOTOLUMINESCENT; EFFICIENCY; CONVERSION; FLUORESCENCE; IMPROVEMENT; ENHANCEMENT; ELECTRON; SHEETS; REDUCTION; OXIDE; PHOTOLUMINESCENT; EFFICIENCY; CONVERSION; FLUORESCENCE; IMPROVEMENT; ENHANCEMENT; ELECTRON; SHEETS; PAN fiber; Hydrothermal cutting; N-doped graphene quantum dot; Photoluminescence; Hole transport layer
- ISSN
- 2211-2855
- URI
- https://pubs.kist.re.kr/handle/201004/122886
- DOI
- 10.1016/j.nanoen.2017.02.013
- Appears in Collections:
- KIST Article > 2017
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