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Suzhou, China

Gao J.,Shandong Normal University | Gao J.,CAS National Center for Nanoscience and Technology | He D.,CAS National Center for Nanoscience and Technology | Zhang W.,CAS National Center for Nanoscience and Technology | And 4 more authors.
Synthetic Metals | Year: 2012

A new acceptor unit, 2-alkyl-thieno[3,4-b]imidazole, was synthesized through an annulation reaction between a 3,4-diaminothiophene derivative and a carboxyl acid or an acyl chloride, and was used for developing donor-acceptor conjugated copolymers. Copolymerization of 2-alkyl-thieno[3,4-b]imidazole and benzo[1,2-b:3,4-b′]dithiophene (BDT) or dithieno[3,2-b:2′,3′- d]silole (DTS) afforded 6 new low bandgap polymers P1-P6. These polymers possess intensive absorption at 400-650 nm and the optical bandgaps are in the range of 1.69-1.88 eV. They were firstly applied in polymer solar cells and the best efficiency of 0.72% was obtained from P2/PC 71BM cells fabricated using a dip-coating method. © 2012 Elsevier B.V. All rights reserved. Source


Liu Y.,Shaanxi Normal University | Liu Y.,CAS National Center for Nanoscience and Technology | Du X.,CAS National Center for Nanoscience and Technology | Cao J.,CAS National Center for Nanoscience and Technology | And 6 more authors.
Synthetic Metals | Year: 2012

N-alkylaziridino[60]fullerenes (NAAFs) were synthesized through the reaction of C 60 and primary alkylamines with the aid of di(acetoxyiodo)benzene (DIB) and I 2 under mild conditions. The NAAFs exhibit similar LUMO energy levels (-3.82 eV to -3.89 eV), which is comparable with PC 61BM. The NAAFs are thermally stable with the decomposition temperature over 230°C and show good solubility in common organic solvents. Polymer solar cells based on N-phenylethylaziridino[60]fullerene/P3HT (0.5:1, w/w) demonstrated a good power conversion efficiency of 2.92% under the illumination of 86 mW/cm 2. The solar cells kept good performance (PCE = 2.71%) even with a very low fullerene content (N-phenylethylaziridino[60] fullerene/P3HT = 0.3:1, w/w). © 2012 Elsevier B.V. All rights reserved. Source


Cao J.,CAS National Center for Nanoscience and Technology | Cao J.,University of Chinese Academy of Sciences | Liao Q.,CAS National Center for Nanoscience and Technology | Du X.,CAS National Center for Nanoscience and Technology | And 5 more authors.
Energy and Environmental Science | Year: 2013

A D-A conjugated polymer (PThTPTI) was developed by using a brand new pentacyclic aromatic lactam acceptor unit (TPTI). PThTPTI possesses good light absorption, thermal stability, and a deep HOMO level. PThTPTI/PC71BM cells afford an outstanding PCE up to 7.80%, with high Voc (0.87 V), Jsc (13.69 mA cm-2) and FF (65.6%), and over 70% EQE in the range of 435-640 nm. © 2013 The Royal Society of Chemistry. Source


Ye G.,Northwest University, China | Ye G.,CAS National Center for Nanoscience and Technology | Chen S.,CAS National Center for Nanoscience and Technology | Xiao Z.,CAS National Center for Nanoscience and Technology | And 3 more authors.
Journal of Materials Chemistry | Year: 2012

Two novel 56π-electron fullerenes, o-quinodimethane-methano[60]fullerene (OQMF) and thieno-o-quinodimethane-methano[60]fullerene (TOQMF), were prepared by Diels-Alder reaction between methano[60]fullerene and o-quinodimethane type dienes. These fullerenes possess not only high LUMO levels but also sterically small addends, featuring outstanding performance in polymer solar cells. Up to 5.74% and 5.51% PCEs were achieved for OQMF/P3HT and TOQMF/P3HT solar cells, respectively. © 2012 The Royal Society of Chemistry. Source


Xiao Z.,CAS National Center for Nanoscience and Technology | Ye G.,CAS National Center for Nanoscience and Technology | Liu Y.,CAS National Center for Nanoscience and Technology | Chen S.,CAS National Center for Nanoscience and Technology | And 3 more authors.
Angewandte Chemie - International Edition | Year: 2012

Fusing two in one: The π-electron systems of fullerene and an oligothiophene were conjugately fused by an open-cage process. This led to novel fullerene-oligothiophene chromophores with significantly enhanced light-absorbing capability, which covers a wide spectral range. The fullerene band gap could be tuned to about 1 eV by a chemical approach. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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