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Solution-Processed Transparent Intermediate Layer for Organic Tandem Solar Cell Using Nitrogen-Doped Graphene Quantum Dots

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The solution-processed intermediate layer (IML), which physically and electrically connects two sub-cells, is critical in the fabrication of efficient organic tandem solar cells. Several studies have examined solution-processed electron transport materials that can be used as n-type layers in the IML. On the other hand, forming an Ohmic contact for holes is limited by the choice of an aqueous-based hole transport layer (HTL) material except for PEDOT:PSS or vacuum evaporating materials. Here, this paper reports highly transparent and solution-processable nitrogen-doped graphene quantum dots (N-GQDs) as an efficient HTL in the IML. Using an IML based on N-GQDs/PEI, the present P3HT:PCBM tandem device showed a slight improvement in the fill factor (10%) and efficiency (15%) compared to the devices using the PEDOT:PSS/PEI-based junction. The optimal tandem cells with N-GQDs showed a double open-circuit voltage of 1.16 V, short-circuit current density of 5.80 mA/cm2, fill factor of 0.55, and power conversion efficiency of 3.69% under AM 1.5G solar irradiation. This result thus makes a start on the use of functional graphene quantum dots in organic tandem solar cells.
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Keywords: Intermediate Layer; Inverted Organic Solar Cell; Nitrogen-Doped Graphene Quantum Dots; Organic Tandem Solar Cell; Solution-Processed

Document Type: Research Article

Affiliations: 1: Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Ulsan 44610, South Korea 2: School of Chemical Engineering, University of Ulsan, Ulsan 44610, South Korea 3: Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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