%0 Journal Article %1 ADFM:ADFM201603820 %A Suman, %A Gupta, Vinay %A Bagui, Anirban %A Singh, Surya Prakash %D 2016 %J Advanced Functional Materials %K nonFullerenAcceptor organics %P n/a--n/a %R 10.1002/adfm.201603820 %T Molecular Engineering of Highly Efficient Small Molecule Nonfullerene Acceptor for Organic Solar Cells %U http://dx.doi.org/10.1002/adfm.201603820 %X A new molecularly engineered nonfullerene acceptor, 2,2′-(5,5′-(9,9-didecyl-9H-fluorene-2,7-diyl)bis(benzoc1,2,5thiadiazole-7,4-diyl)bis(methanylylidene))bis(3-hexyl-1,4-oxothiazolidine-5,2-diylidene))dimalononitrile (BAF-4CN), with fluorene as the core and arms of dicyano-n-hexylrhodanine terminated benzothiadiazole is synthesized and used as an electron acceptor in bulk heterojunction organic solar cells. BAF-4CN shows a stronger and broader absorption with a high molar extinction coefficient of 7.8 × 104m−1 cm−1 at the peak position (498 nm). In the thin film, the molecule shows a redshift around 17 nm. The photoluminescence experiments confirm the excellent electron accepting nature of BAF-4CN with a Stern–Volmer coefficient (Ksv) of 1.1 × 105m−1. From the electrochemical studies, the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of BAF-4CN are estimated to be −5.71 and −3.55 eV, respectively, which is in good synchronization with low bandgap polymer donors. Using BAF-4CN as an electron acceptor in a poly(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3″′-di(2-octyldodecyl) 2,2′;5′,2″;5″,2″′-quaterthiophen-5,5″′-diyl) based bulk-heterojunction solar cell, a maximum power conversion efficiency of 8.4% with short-circuit current values of 15.52 mA cm−2, a fill factor of 70.7%, and external quantum efficiency of about 84% covering a broad range of wavelength is achieved.

@article{ADFM:ADFM201603820, abstract = {A new molecularly engineered nonfullerene acceptor, 2,2′-(5,5′-(9,9-didecyl-9H-fluorene-2,7-diyl)bis(benzo[c][1,2,5]thiadiazole-7,4-diyl)bis(methanylylidene))bis(3-hexyl-1,4-oxothiazolidine-5,2-diylidene))dimalononitrile (BAF-4CN), with fluorene as the core and arms of dicyano-n-hexylrhodanine terminated benzothiadiazole is synthesized and used as an electron acceptor in bulk heterojunction organic solar cells. BAF-4CN shows a stronger and broader absorption with a high molar extinction coefficient of 7.8 × 104m−1 cm−1 at the peak position (498 nm). In the thin film, the molecule shows a redshift around 17 nm. The photoluminescence experiments confirm the excellent electron accepting nature of BAF-4CN with a Stern–Volmer coefficient (Ksv) of 1.1 × 105m−1. From the electrochemical studies, the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of BAF-4CN are estimated to be −5.71 and −3.55 eV, respectively, which is in good synchronization with low bandgap polymer donors. Using BAF-4CN as an electron acceptor in a poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3″′-di(2-octyldodecyl) 2,2′;5′,2″;5″,2″′-quaterthiophen-5,5″′-diyl)] based bulk-heterojunction solar cell, a maximum power conversion efficiency of 8.4% with short-circuit current values of 15.52 mA cm−2, a fill factor of 70.7%, and external quantum efficiency of about 84% covering a broad range of wavelength is achieved.}, added-at = {2016-11-17T09:00:27.000+0100}, author = {Suman and Gupta, Vinay and Bagui, Anirban and Singh, Surya Prakash}, biburl = {https://www.bibsonomy.org/bibtex/2cdffbde4d5ea12676915b224dac80a7e/cgoehler}, description = {Rhodamine based non-fullerene acceptor, OCE 8.4%, FF 70.7%}, doi = {10.1002/adfm.201603820}, interhash = {535c5026de0827a74c8da227479670e3}, intrahash = {cdffbde4d5ea12676915b224dac80a7e}, issn = {1616-3028}, journal = {Advanced Functional Materials}, keywords = {nonFullerenAcceptor organics}, pages = {n/a--n/a}, timestamp = {2016-11-17T09:00:27.000+0100}, title = {Molecular Engineering of Highly Efficient Small Molecule Nonfullerene Acceptor for Organic Solar Cells}, url = {http://dx.doi.org/10.1002/adfm.201603820}, year = 2016 }