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

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b03740· OSTI ID:1370256
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  1. South China Univ. of Technology, Guangzhou (Poeple's Republic of China)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Massachusetts, Amherst, MA (United States)
  4. Eindhoven Univ. of Technology (The Netherlands)
In this work, 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 nm. 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/cm2, 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.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Polymer-Based Materials for Harvesting Solar Energy (PHaSE); Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
International Science & Technology Cooperation Program of China; Ministry of Science and Technology of the People’s Republic of China (MOST); National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001087
OSTI ID:
1370256
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 23 Vol. 137; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)