2016
DOI: 10.1002/aenm.201601081
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Toward High Efficiency Polymer Solar Cells: Influence of Local Chemical Environment and Morphology

Abstract: Materials by design are expected to deliver optimized performance for well-defined applications. [1,2] In most cases, the performance of a material depends on the chemical structure and kinetic processes that control the morphology formed, making material design a challenge to directly relate chemical structure to performance. Examples are seen in semiconducting polymers. While the conjugated backbone provides optoelectronic function, side chains, substitution groups, and molecular geometry are factors that di… Show more

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Cited by 44 publications
(50 citation statements)
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“…As shown in Figure , both polymers were prepared via the Stille polycondensation reaction using 5‐fluorobenzothiadiazole (FBT) and thiophene units under microwave‐assisted heating. To synthesize the regioregular polymer 2TRR , the monomer M1 contains each of the reactive functional groups on a single precursor, thus ensuring strict ordering of the asymmetric D–A structural units within the polymer backbone . A related random polymer 2TRA can be synthesized with a dibrominated FBT‐thiophene monomer ( M2 ) and the distannylated thiophene monomer ( M3 ).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…As shown in Figure , both polymers were prepared via the Stille polycondensation reaction using 5‐fluorobenzothiadiazole (FBT) and thiophene units under microwave‐assisted heating. To synthesize the regioregular polymer 2TRR , the monomer M1 contains each of the reactive functional groups on a single precursor, thus ensuring strict ordering of the asymmetric D–A structural units within the polymer backbone . A related random polymer 2TRA can be synthesized with a dibrominated FBT‐thiophene monomer ( M2 ) and the distannylated thiophene monomer ( M3 ).…”
Section: Resultsmentioning
confidence: 99%
“…This is surprising; in many cases, the regioregular polymer has a better mobility relative to the random counterpart. [10,15b]…”
Section: Resultsmentioning
confidence: 99%
“…In addition to material design and synthesis, which involves new route, structure characterization, material purification, etc., the process of material optimization and evaluation is also uncertain. On one hand, the efficient device performance is achieved under the synergistic effects of donor/acceptor (D/A) combinations, including complementary absorption 8 , matched energy levels 9 , favorable blend morphology with nanoscale phase separation 10 , high and balanced charge transport property [11][12][13] , etc. On the other hand, adjusting processing parameters such as D/A ratio, processing solvent and solvent additive, pre-and post-treatments, selection of film forming technology and so on [14][15][16][17][18] , and constructing device architectures via interface engineering and device engineering [19][20][21] , are also tedious and laborious work.…”
Section: Introductionmentioning
confidence: 99%
“…One of the most successful ways to design a conjugated polymer with good photovoltaic performance is the donor–acceptor (D–A) approach, where the polymer backbone consists of an electron-rich donor unit and an electron-deficient acceptor unit alternatively [ 23 , 24 , 25 , 26 , 27 , 28 ]. Meanwhile, the morphological optimization of the active layer in PSCs also plays a key role to improve the photovoltaic performance by facilitating the charge generation, separation, and transport within the device [ 29 , 30 , 31 , 32 ]. Various methods such as thermal annealing, solvent annealing, and adding additives have been used to control the morphology to achieve favorable phase separation.…”
Section: Introductionmentioning
confidence: 99%