Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 23, Pages 7282-7285Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b03740
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Funding
- International Science & Technology Cooperation Program of China [2013DFG52740, 2010DFA52150]
- Ministry of Science and Technology [2014CB643500]
- National Natural Science Foundation of China [51473053, 51073060]
- Polymer-Based Materials for Harvesting Solar Energy (PHaSE), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Basic Energy Sciences [DE-SC0001087]
- DOE, Office of Science
- DOE, Office of Basic Energy Sciences
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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.
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