2014
DOI: 10.1002/adma.201403080
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Organic Solar Cells Using a High‐Molecular‐Weight Benzodithiophene–Benzothiadiazole Copolymer with an Efficiency of 9.4%

Abstract: A high molecular weight donor-acceptor conjugated polymer is synthesized using the Suzuki polycondensation method. Using this polymer, a single-junction bulk-heterojunction solar cell is fabricated giving a power conversion efficiency of 9.4% using a fullerene-modified ZnO interlayer at the cathode contact.

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Cited by 190 publications
(122 citation statements)
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“…The bis-borylated product was isolated by precipitation on addition of isopropanol (IPA), and an analytically pure material isolated by filtration in excellent yields >90%, Scheme 4. This simplified purification is in direct contrast with reported procedures for the bis-iodinated or bis-stannylated analogues [2021]. …”
Section: Resultsmentioning
confidence: 88%
“…The bis-borylated product was isolated by precipitation on addition of isopropanol (IPA), and an analytically pure material isolated by filtration in excellent yields >90%, Scheme 4. This simplified purification is in direct contrast with reported procedures for the bis-iodinated or bis-stannylated analogues [2021]. …”
Section: Resultsmentioning
confidence: 88%
“…In most BDT-BT copolymers, an aromatic unit such as thiophene or furan is used as a spacer between BDT and BT [13][14][16][17] . A PCE of 9.40% has been reported for a copolymer direct linking of BDT with BT unit 18 , however, the BDT in this reference is not a simple BDT, but have two thiophenes attached to the central benzene.…”
Section: Introductionmentioning
confidence: 93%
“…[1][2][3][4][5][6][7] With such a promising initial efficiency, the long-term performance of OSCs also needs to be considered. 8,9 Extrapolated lifetimes of 2-3 years are reported in glass-on-glass encapsulated OSCs using the polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) blended with [6,6]-phenyl-C 60 -butyric acid methyl ester (PCBM), 10 and lifetimes of 7-10 years are reported in encapsulated OSCs with the polymer poly[9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT) 11 and fullerene [6,6]phenyl-C 70 -butyric acid methyl ester (PC 71 BM). 12,13 When polymer solar cells made from PCDTBT and PC 71 BM are illuminated in an environment with less than 0.1 parts per million (ppm) oxygen and water, extrapolated lifetimes approaching 20 years are observed, 14 which rivals the lifetimes observed in some evaporated small-molecule solar cells.…”
Section: Introductionmentioning
confidence: 99%