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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Effects of Ionic Liquid Molecules in Hybrid PbS Quantum Dot-Organic Solar Cells

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Title
Effects of Ionic Liquid Molecules in Hybrid PbS Quantum Dot-Organic Solar Cells
Author
Kim, Gi-HwanKim, Hak-BeomWalker, BrightChoi, HyosungYang, ChangjinPark, JongnamKim, Jin Young
Keywords
Hybrid solar cells; Liquid molecules; PbS; Photovoltaics; Quantum dot solar cells
Issue Date
201303
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.5, no.5, pp.1757 - 1760
Abstract
We investigated the effect of ionic liquid molecules (ILMs) in hybrid quantum dot-organic solar cells (HyQD-OSCs). The insertion of an ILM layer between PbS and phenyl-C61-butyric acid methyl ester (PCBM) can shift the band edge of PCBM closer to the vacuum level of PbS due to spontaneous dipole polarization. Because of this new architecture, improvements in device performance were achieved, including increases in open-circuit voltage (V-OC, from 0.41 V to 0.49 V), fill factor (FF, from 0.48 to 0.59), and power conversion efficiency (PCE, from 1.62% to 2.21%), compared to reference devices under AM 1.5G illumination at 100 mW cm(-2). We observed that treatment of the PbS layer with ILMs causes a significant increase in work function from 3.58 eV to 3.93 eV. Furthermore, the ILMs layer minimizes the contact resistance between PbS and PCBM due to the improved compatibility between the two layers, confirmed as a decrease in charge transfer resistance, as measured by electrical impedance spectroscopy.
URI
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DOI
http://dx.doi.org/10.1021/am3029766
ISSN
1944-8244
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