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Photovoltaic enhancement of organic solar cells by a bridged donor-acceptor block copolymer approach

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8 Author(s)
Sun, Sam-Shajing ; Center for Materials Research, Norfolk State University, Norfolk, Virginia 23504 ; Zhang, Cheng ; Ledbetter, Abram ; Choi, Soobum
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The authors show that a photovoltaic device composed of a -donor-bridge–acceptor-bridge- type block copolymer thin film exhibits a significant performance improvement over its corresponding donor/acceptor blend (Voc increased from 0.14 to 1.10 V and Jsc increased from 0.017 to 0.058 mA/cm2) under identical conditions, where donor is an alkyl derivatized poly-p-phenylenevinylene (PPV) conjugated block, acceptor is a sulfone-alkyl derivatized PPV conjugated block, and bridge is a nonconjugated and flexible unit. The authors attribute such improvement to the block copolymer intrinsic nanophase separation and molecular self-assembly that results in the reduction of the exciton and carrier losses.

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Applied Physics Letters  (Volume:90 ,  Issue: 4 )