%0 Journal Article %1 AENM:AENM201701405 %A Shin, Injeong %A Ahn, Hyung ju %A Yun, Jae Hoon %A Jo, Jea Woong %A Park, Sungmin %A Joe, Sung-yoon %A Bang, Joona %A Son, Hae Jung %D 2017 %J Advanced Energy Materials %K large_area nonfullerene polymer terpolymer %P n/a--n/a %R 10.1002/aenm.201701405 %T High-Performance and Uniform 1 cm2 Polymer Solar Cells with D1-A-D2-A-Type Random Terpolymers %U http://dx.doi.org/10.1002/aenm.201701405 %X For the commercial development of organic photovoltaics (OPVs), laboratory-scale OPV technology must be translated to large area modules. In particular, it is important to develop high-efficiency polymers that can form thick (>100 nm) bulk heterojunction (BHJ) films over large areas with optimal morphologies for charge generation and transport. Here, D1-A-D2-A random terpolymers composed of 2,2′-bithiophene with various proportions of 5,6-difluoro-4,7-bis(thiophen-2-yl)-2,1,3-benzothiadiazole and 5,6-difluoro-2,1,3-benzothiadiazole (FBT) are synthesized. It is found that incorporating small proportions of FBT into the polymer not only conserves the high crystallinity and favorable face-on orientation of the D-A copolymer FBT-Th4 but also improves the nanoscale phase separation of the BHJ film. Consequently, the random terpolymer PDT2fBT-BT10 exhibits a much improved solar cell efficiency of 10.31% when compared to that of the copolymer FBT-Th4 (8.62%). Moreover, due to this polymer's excellent processability and suppressed overaggregation, OPVs with 1 cm2 active area based on 351 nm thick PDT2fBT-BT10 BHJs exhibit high photovoltaic performance of 9.42%, whereas rapid efficiency decreases arise for FBT-Th4-based OPVs for film thicknesses above 300 nm. It is demonstrated that this random terpolymer can be used in large area and thick BHJ OPVs, and guidelines for developing polymers that are suitable for large-scale printing technologies are presented.

@article{AENM:AENM201701405, abstract = {For the commercial development of organic photovoltaics (OPVs), laboratory-scale OPV technology must be translated to large area modules. In particular, it is important to develop high-efficiency polymers that can form thick (>100 nm) bulk heterojunction (BHJ) films over large areas with optimal morphologies for charge generation and transport. Here, D1-A-D2-A random terpolymers composed of 2,2′-bithiophene with various proportions of 5,6-difluoro-4,7-bis(thiophen-2-yl)-2,1,3-benzothiadiazole and 5,6-difluoro-2,1,3-benzothiadiazole (FBT) are synthesized. It is found that incorporating small proportions of FBT into the polymer not only conserves the high crystallinity and favorable face-on orientation of the D-A copolymer FBT-Th4 but also improves the nanoscale phase separation of the BHJ film. Consequently, the random terpolymer PDT2fBT-BT10 exhibits a much improved solar cell efficiency of 10.31% when compared to that of the copolymer FBT-Th4 (8.62%). Moreover, due to this polymer's excellent processability and suppressed overaggregation, OPVs with 1 cm2 active area based on 351 nm thick PDT2fBT-BT10 BHJs exhibit high photovoltaic performance of 9.42%, whereas rapid efficiency decreases arise for FBT-Th4-based OPVs for film thicknesses above 300 nm. It is demonstrated that this random terpolymer can be used in large area and thick BHJ OPVs, and guidelines for developing polymers that are suitable for large-scale printing technologies are presented.}, added-at = {2018-01-22T14:45:31.000+0100}, author = {Shin, Injeong and Ahn, Hyung ju and Yun, Jae Hoon and Jo, Jea Woong and Park, Sungmin and Joe, Sung-yoon and Bang, Joona and Son, Hae Jung}, biburl = {https://www.bibsonomy.org/bibtex/24d8860809b4dce6c9efc16d805287eb5/bretschneider_m}, description = {onlinelibrary.wiley.com/doi/10.1002/aenm.201701405/epdf}, doi = {10.1002/aenm.201701405}, interhash = {c66ec3bb857c48b02f2d686c3aad5a27}, intrahash = {4d8860809b4dce6c9efc16d805287eb5}, issn = {1614-6840}, journal = {Advanced Energy Materials}, keywords = {large_area nonfullerene polymer terpolymer}, pages = {n/a--n/a}, timestamp = {2018-01-22T14:45:31.000+0100}, title = {High-Performance and Uniform 1 cm2 Polymer Solar Cells with D1-A-D2-A-Type Random Terpolymers}, url = {http://dx.doi.org/10.1002/aenm.201701405}, year = 2017 }