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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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Stabilized Polymers with Novel Indenoindene Backbone against Photodegradation for LEDs and Solar Cells

Cited 49 times inthomson ciCited 52 times inthomson ci
Title
Stabilized Polymers with Novel Indenoindene Backbone against Photodegradation for LEDs and Solar Cells
Author
Song, SuheeJin, YoungeupKim, Sun HeeMoon, JihyunKim, KwanghyunKim, Jin YoungPark, Sung HeumLee, KwangheeSuh, Hongsuk
Keywords
Absorbance; Active layers; Alkyl groups; Benzothiadiazole; Cell-based; Emission bands; Fill factors; High power conversions; Phenylene vinylenes; Poly (P; Polymer solar cells; PPV derivatives; Processability; Short wavelengths; Tetrakis; Visible regions; White lights
Issue Date
200810
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.41, no.20, pp.7296 - 7305
Abstract
PPV derivatives, polymers with vinylene units, have their tendency to exhibit degradation, after irradiation with white light or operation of the device, resulting in the appearance of a shifted absorption and emission band in the short wavelength regions of the spectra. In this paper, we report the synthesis and properties of new polymers utilizing new backbone, poly(5,5,10,10-tetrakis(2-ethylhexyl)-5,10-dihydroindeno[2,1-a]indene-2,7-diyl) (PININE). In order to reduce oxidation of the vinylene group, the vinylene group was cyclized using two 5-membered rings. While poly(p-phenylenevinylene) derivatives show significantly blue-shifted and decreased peaks of UV-vis, blue-shifted maximum peaks of photoluminescence (PL) after irradiation with white light in air, and blue-shifted maximum peaks of electroluminescence (EL) after operation of the device, PININE shows stable spectra of UV-vis, and PL, and EL under the same conditions. PININE copolymers with benzothiadiazole and thiophene units exhibit high power conversion efficiency (PCE) for polymer solar cells. Under white light illumination (AM 1.5 G, 100 mW/cm2), the cell based on PININEDTBT/PCBM as the active layer has a short circuit current density (ISC) of 5.93 mA/cm2, a fill factor (FF) of 43%, and PCE of 1.88%. These copolymers have not only good processability due to the indenoindene unit, in which four alkyl groups can be incorporated, but also strong and uniform absorbance in the whole visible region.
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DOI
http://dx.doi.org/10.1021/ma801420e
ISSN
0024-9297
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