Multi-functional nitrogen self-doped graphene quantum dots for boosting the photovoltaic performance of BHJ solar cells

Authors
Moon, Byung JoonJang, DawonYi, YeonjinLee, HyunbokKim, Sang JinOh, YelinLee, Sang HyunPark, MinLee, SunghoBae, 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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