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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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Efficient Conventional- and Inverted-Type Photovoltaic Cells Using a Planar Alternating Polythiophene Copolymer

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Title
Efficient Conventional- and Inverted-Type Photovoltaic Cells Using a Planar Alternating Polythiophene Copolymer
Author
Lee, WonhoChoi, HyosungHwang, SunguKim, Jin YoungWoo, Han Young
Keywords
Air mass; Alternating copolymer; Benzothiadiazoles; Bicontinuous; Deep level; Donor-acceptors; Film morphology; Intermolecular ordering; Inverted devices; Methyl esters; Molecular design; Photovoltaic applications; Photovoltaic devices; pi interactions; Poly (3-hexylthiophene); Polythiophene copolymers; Power conversion efficiencies; Processable; Space-charge-limited current; Torsion angle
Issue Date
201202
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMISTRY-A EUROPEAN JOURNAL, v.18, no.9, pp.2551 - 2558
Abstract
A low-band-gap alternating copolymer, poly{5,6-bis(octyloxy)-4-(thiophen-2-yl)benzo[c]-1,2,5-thiadiazole} (PTBT), was synthesized and investigated for photovoltaic applications. PTBT showed a minimized torsion angle in its main backbone owing to the introduction of solubilizing octyloxy groups on the electron-poor benzothiadiazole unit, thereby resulting in pronounced intermolecular ordering and a deep level of the HOMO (-5.41 eV). By blending PTBT with [6,6]phenyl-C61-butyric acid methyl ester (PC61BM), highly promising performance was achieved with power-conversion efficiencies (PCEs) of 5.9 and 5.3?% for the conventional and inverted devices, respectively, under air mass 1.5 global (AM 1.5G, 100 mW?cm-2) illumination. The open-circuit voltage (VOC0.850.87 V) is one of the highest values reported thus far for thiophene-based polymers (e.g., poly(3-hexylthiophene) VOC0.6 V). The inverted device also achieved a remarkable PCE compared to other devices based on low-band-gap polymers. Ideal film morphology with bicontinuous percolation pathways was expected from the atomic force microscopy (AFM) images, space-charge-limited current (SCLC) mobility, and selected-area electron-diffraction (SAED) measurements. This molecular design strategy is useful for achieving simple, processable, and planar donoracceptor (DA)-type low-band-gap polymers with a deep HOMO for applications in photovoltaic cells.
URI
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DOI
http://dx.doi.org/10.1002/chem.201102883
ISSN
0947-6539
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