High-Performance As-Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency
Qunping Fan1, Yan Wang1, Maojie Zhang1,*（张茂杰）, Bo Wu2, Xia Guo1, Yufeng Jiang3, Wanbin Li1, Bing Guo1, Chennan Ye1, Wenyan Su1, Jin Fang1, Xuemei Ou1, Feng Liu4,*（刘烽）, Zhixiang Wei5,Tze Chien Sum2, Thomas P. Russell3, and Yongfang Li1,6
1Soochow University State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Suzhou China
2Nanyang Technological University Division of Physics and Applied Physics Singapore
3Lawrence Berkeley National Laboratory Materials Sciences Division Berkeley CA USA
4Shanghai Jiaotong University Department of Physics and Astronomy Shanghai China
5National Center for Nanoscience and Technology CAS Key Laboratory of Nanosystem and Hierarchical Fabrication Beijing China
6Chinese Academy of Sciences CAS Research/Education Center for Excellence in Molecular Sciences Beijing China
Adv. Mater.2018,30, 1704546
In this work, a nonfullerene polymer solar cell (PSC) based on a wide bandgap polymer donor PM6 containing fluorinated thienyl benzodithiophene (BDT-2F) unit and a narrow bandgap small molecule acceptor 2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) is developed. In addition to matched energy levels and complementary absorption spectrum with IDIC, PM6 possesses high crystallinity and strong π–π stacking alignment, which are favorable to charge carrier transport and hence suppress recombination in devices. As a result, the PM6:IDIC-based PSCs without extra treatments show an outstanding power conversion efficiency (PCE) of 11.9%, which is the record value for the as-cast PSC devices reported in the literature to date. Moreover, the device performances are insensitive to the active layer thickness (≈95–255 nm) and device area (0.20–0.81 cm2) with PCEs of over 11%. Besides, the PM6:IDIC-based flexible PSCs with a large device area of 1.25 cm2exhibit a high PCE of 6.54%. These results indicate that the PM6:IDIC blend is a promising candidate for future roll-to-roll mass manufacturing and practical application of highly efficient PSCs.
链接：http://onlinelibrary.wiley.com/doi/10.1002/adma.201704546/full