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High-efficiency photovoltaic cells with wide optical band gap polymers based on fluorinated phenylene-alkoxybenzothiadiazole

Title
High-efficiency photovoltaic cells with wide optical band gap polymers based on fluorinated phenylene-alkoxybenzothiadiazole
Authors
Ko S.-J.Hoang Q.V.Song C.E.Uddin M.A.Lim E.Park S.Y.Lee B.H.Song S.Moon S.-J.Hwang S.Morin P.-O.Leclerc M.Su G.M.Chabinyc M.L.Woo H.Y.Shin W.S.Kim J.Y.
Ewha Authors
이병훈
SCOPUS Author ID
이병훈scopus
Issue Date
2017
Journal Title
Energy and Environmental Science
ISSN
1754-5692JCR Link
Citation
vol. 10, no. 6, pp. 1443 - 1455
Publisher
Royal Society of Chemistry
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A series of semi-crystalline, wide band gap (WBG) photovoltaic polymers were synthesized with varying number and topology of fluorine substituents. To decrease intramolecular charge transfer and to modulate the resulting band gap of D-A type copolymers, electron-releasing alkoxy substituents were attached to electron-deficient benzothiadiazole (A) and electron-withdrawing fluorine atoms (0-4F) were substituted onto a 1,4-bis(thiophen-2-yl)benzene unit (D). Intra- and/or interchain noncovalent Coulombic interactions were also incorporated into the polymer backbone to promote planarity and crystalline intermolecular packing. The resulting optical band gap and the valence level were tuned to 1.93-2.15 eV and -5.37 to -5.67 eV, respectively, and strong interchain organization was observed by differential scanning calorimetry, high-resolution transmission electron microscopy and grazing incidence X-ray scattering measurements. The number of fluorine atoms and their position significantly influenced the photophysical, morphological and optoelectronic properties of bulk heterojunctions (BHJs) with these polymers. BHJ photovoltaic devices showed a high power conversion efficiency (PCE) of up to 9.8% with an open-circuit voltage of 0.94-1.03 V. To our knowledge, this PCE is one of the highest values for fullerene-based single BHJ devices with WBG polymers having a band gap of over 1.90 eV. A tandem solar cell was also demonstrated successfully to show a PCE of 10.3% by combining a diketopyrrolopyrrole-based low band gap polymer. © The Royal Society of Chemistry 2017.
DOI
10.1039/c6ee03051c
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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