%0 Journal Article %1 ADFM:ADFM201600350 %A Zhang, Sheng %A Zhang, Zijian %A Liu, Jun %A Wang, Lixiang %D 2016 %J Advanced Functional Materials %K fullerenes %N 33 %P 6107--6113 %R 10.1002/adfm.201600350 %T Fullerene Adducts Bearing Cyano Moiety for Both High Dielectric Constant and Good Active Layer Morphology of Organic Photovoltaics %U http://dx.doi.org/10.1002/adfm.201600350 %V 26 %X Power conversion efficiency (PCE) of organic photovoltaics (OPVs) lags behind of inorganic photovoltaics due to low dielectric constants (ε r) of organic semiconductors. Although OPVs with high ε r are attractive in theory, practical demonstration of efficient OPV devices with high-ε r materials is in its infancy. This is largely due to the contradiction between the requirements of high ε r and good donor:acceptor blend morphology in the bulk heterojunction. Herein, a series of fullerene acceptors is reported bearing a polar cyano moiety for both high ε r and good donor:acceptor blend morphology. These cyano-functionalized acceptors (ε r = 4.9) have higher ε r than that of the widely used acceptor, 6,6-phenyl-C61-butyric acid methyl ester (PC61BM) (ε r = 3.9). The high ε r is realized without decrease of electron mobility and change of the lowest unoccupied molecular orbital/highest occupied molecular orbital (LUMO/HOMO) energy levels. Although the cyano-functionalized acceptors have increased polarity, they still exhibit good compatibility with the typical donor polymer. Polymer solar cells based on the cyano-functionalized acceptors exhibit good active layer morphology and show better device performance (PCE = 5.55%) than that of PC61BM (PCE = 4.56%).

@article{ADFM:ADFM201600350, abstract = {Power conversion efficiency (PCE) of organic photovoltaics (OPVs) lags behind of inorganic photovoltaics due to low dielectric constants (ε r) of organic semiconductors. Although OPVs with high ε r are attractive in theory, practical demonstration of efficient OPV devices with high-ε r materials is in its infancy. This is largely due to the contradiction between the requirements of high ε r and good donor:acceptor blend morphology in the bulk heterojunction. Herein, a series of fullerene acceptors is reported bearing a polar cyano moiety for both high ε r and good donor:acceptor blend morphology. These cyano-functionalized acceptors (ε r = 4.9) have higher ε r than that of the widely used acceptor, [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) (ε r = 3.9). The high ε r is realized without decrease of electron mobility and change of the lowest unoccupied molecular orbital/highest occupied molecular orbital (LUMO/HOMO) energy levels. Although the cyano-functionalized acceptors have increased polarity, they still exhibit good compatibility with the typical donor polymer. Polymer solar cells based on the cyano-functionalized acceptors exhibit good active layer morphology and show better device performance (PCE = 5.55%) than that of PC61BM (PCE = 4.56%).}, added-at = {2016-09-06T11:17:13.000+0200}, author = {Zhang, Sheng and Zhang, Zijian and Liu, Jun and Wang, Lixiang}, biburl = {https://www.bibsonomy.org/bibtex/290fb90ba560e1e603fbcc380f4409999/cgoehler}, doi = {10.1002/adfm.201600350}, interhash = {54f02211bafe4a1151a98d6a1a9a82e0}, intrahash = {90fb90ba560e1e603fbcc380f4409999}, issn = {1616-3028}, journal = {Advanced Functional Materials}, keywords = {fullerenes}, number = 33, pages = {6107--6113}, timestamp = {2016-09-06T11:17:13.000+0200}, title = {Fullerene Adducts Bearing Cyano Moiety for Both High Dielectric Constant and Good Active Layer Morphology of Organic Photovoltaics}, url = {http://dx.doi.org/10.1002/adfm.201600350}, volume = 26, year = 2016 }