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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Inverted Organic Solar Cell;
Nitrogen-Doped Graphene Quantum Dots;
Organic Tandem Solar Cell;
Document Type: Research Article
Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Ulsan 44610, South Korea
School of Chemical Engineering, University of Ulsan, Ulsan 44610, South Korea
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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