Ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer: optoelectronic properties, film morphology and photovoltaic applications
Abstract
Here, an ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer, EDPP, was designed and synthesized to improve the open-circuit voltage of organic solar cells. The influence of the ethynylene on optoelectronic properties, energy levels, crystallinity, film morphology, and photovoltaic performance was investigated. Optical and electrochemical tests showed that introduction of ethynylene into the polymer backbone resulted in a larger bandgap, deeper HOMO energy level, and enhanced crystallinity due to the planar conformation and electron-withdrawing properties. Grazing incidence wide-angle X-ray scattering (GIWAXS) showed that the pure EDPP film preferentially adopted a face-on orientation with a π–π stacking distance of 3.65 Å. After thermal annealing the face-on and edge-on orientations coexisted and the overall degree of crystallinity increased. Blending with PC71BM did not disrupt the crystallinity of the EDPP. Resonant soft X-ray scattering (RSoXS) showed that the EDPP:PC71BM blend films contained large domains, a few hundred nanometers in size. As a result, EDPP:PC71BM photovoltaic devices exhibited a high open-circuit voltage of 0.88 V, but a low short-circuit current, with a moderate power conversion efficiency of 1.98%.
- Authors:
-
- Shanghai Univ. (China); Fudan Univ., Shanghai (China)
- Shanghai Univ. (China)
- Univ. of Massachusetts, Amherst, MA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Massachusetts, Amherst, MA (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Polymer-Based Materials for Harvesting Solar Energy (PHaSE)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1370264
- Grant/Contract Number:
- SC0001087; 61204020
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry. A
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 24; Related Information: PHaSE partners with University of Massachusetts, Amherst (lead) and Lowell; Oak Ridge National Laboratory; Pennsylvania State University; Renssalaer Polytechnic Institute; University of Pittsburgh; Journal ID: ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Wang, Hongyu, Ding, Yimin, Lai, Yanbang, Sun, Zhiwei, Liu, Yao, Jiang, Bin, Chen, Ming, Yao, Jian, Liu, Feng, and Russell, Thomas P. Ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer: optoelectronic properties, film morphology and photovoltaic applications. United States: N. p., 2015.
Web. doi:10.1039/c5ta01004g.
Wang, Hongyu, Ding, Yimin, Lai, Yanbang, Sun, Zhiwei, Liu, Yao, Jiang, Bin, Chen, Ming, Yao, Jian, Liu, Feng, & Russell, Thomas P. Ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer: optoelectronic properties, film morphology and photovoltaic applications. United States. https://doi.org/10.1039/c5ta01004g
Wang, Hongyu, Ding, Yimin, Lai, Yanbang, Sun, Zhiwei, Liu, Yao, Jiang, Bin, Chen, Ming, Yao, Jian, Liu, Feng, and Russell, Thomas P. Tue .
"Ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer: optoelectronic properties, film morphology and photovoltaic applications". United States. https://doi.org/10.1039/c5ta01004g. https://www.osti.gov/servlets/purl/1370264.
@article{osti_1370264,
title = {Ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer: optoelectronic properties, film morphology and photovoltaic applications},
author = {Wang, Hongyu and Ding, Yimin and Lai, Yanbang and Sun, Zhiwei and Liu, Yao and Jiang, Bin and Chen, Ming and Yao, Jian and Liu, Feng and Russell, Thomas P.},
abstractNote = {Here, an ethynylene-linked benzo[1,2-b:4,5-b']dithiophene-alt-diketopyrrolopyrrole alternating copolymer, EDPP, was designed and synthesized to improve the open-circuit voltage of organic solar cells. The influence of the ethynylene on optoelectronic properties, energy levels, crystallinity, film morphology, and photovoltaic performance was investigated. Optical and electrochemical tests showed that introduction of ethynylene into the polymer backbone resulted in a larger bandgap, deeper HOMO energy level, and enhanced crystallinity due to the planar conformation and electron-withdrawing properties. Grazing incidence wide-angle X-ray scattering (GIWAXS) showed that the pure EDPP film preferentially adopted a face-on orientation with a π–π stacking distance of 3.65 Å. After thermal annealing the face-on and edge-on orientations coexisted and the overall degree of crystallinity increased. Blending with PC71BM did not disrupt the crystallinity of the EDPP. Resonant soft X-ray scattering (RSoXS) showed that the EDPP:PC71BM blend films contained large domains, a few hundred nanometers in size. As a result, EDPP:PC71BM photovoltaic devices exhibited a high open-circuit voltage of 0.88 V, but a low short-circuit current, with a moderate power conversion efficiency of 1.98%.},
doi = {10.1039/c5ta01004g},
journal = {Journal of Materials Chemistry. A},
number = 24,
volume = 3,
place = {United States},
year = {Tue May 12 00:00:00 EDT 2015},
month = {Tue May 12 00:00:00 EDT 2015}
}
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