Deep Absorbing Porphyrin Small Molecule for High-Performance Organic Solar Cells with Very Low Energy Losses

被引:441
作者
Gao, Ke [1 ]
Li, Lisheng [1 ]
Lai, Tianqi [1 ]
Xiao, Liangang [1 ]
Huang, Yuan [1 ]
Huang, Fei [1 ]
Peng, Junbiao [1 ]
Cao, Yong [1 ]
Liu, Feng [2 ]
Russell, Thomas P. [2 ,3 ]
Janssen, Rene A. J. [4 ]
Peng, Xiaobin [1 ]
机构
[1] S China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China
[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
[3] Univ Massachusetts, Polymer Sci & Engn Dept, Amherst, MA 01003 USA
[4] Eindhoven Univ Technol, Mol Mat & Nanosyst, NL-5600 MB Eindhoven, Netherlands
基金
中国国家自然科学基金; 对外科技合作项目(国际科技项目);
关键词
PROCESSED SMALL-MOLECULE; OPEN-CIRCUIT VOLTAGE; POLYMER; BENZODITHIOPHENE; EFFICIENCY; DIKETOPYRROLOPYRROLE; UNIT;
D O I
10.1021/jacs.5b03740
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We designed and synthesized the DPPEZnP-TEH molecule, With a porphyrin ring linked to two diketopyrrolopyrrole units by ethynylene bridges. The resulting material exhibits a very low energy band gap of 1.37 eV and a broad light absorption to 907 nth. An open-circuit voltage of 0:78 V was obtained in bulk heterojunction (BHJ) organic solar cells, showing a low energy loss of only 0.59 eV,. Which is the first report that small molecule solar cells show energy losses <0.6 eV. The optimized solar cells show remarkable external quantum efficiency, short circuit current, and power conversion efficiency up to 65%, 16.76 mA/cm(2), and 8.08%, respectively, which are the best values for BHJ solar cells with very low energy losses. Additionally, the morphology of DPPEZnP-TEH neat and blend films with PC61BM was studied thoroughly by grazing incidence X-ray diffraction, resonant soft X-ray scattering, and transmission electron microscopy under different fabrication conditions.
引用
收藏
页码:7282 / 7285
页数:4
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