Chlorinated Wide-Bandgap Donor Polymer Enabling Annealing Free Nonfullerene Solar Cells with the Efficiency of 11.5%
Journal Article
·
· Journal of Physical Chemistry Letters
- Wuhan Inst.of Technology, Wuhan (China). Inst. of Materials for Optoelectronics and New Energy, School of Materials Science and Engineering
- Huazhong Univ. of Science and Technology, Wuhan (China). Wuhan National Lab. for Optoelectronics
- Nanjing Univ. of Technology (China). School of Chemistry and Chemical Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Chicago, IL (United States). Inst. of Molecular Engineering
Substituting the hydrogen atoms on the conjugated side chain of a wide-bandgap polymer J52 with chlorine atoms can simultaneously increase the Jsc, Voc, and FF of nonfullerene OSCs, leading to an efficiency boost from 3.78 to 11.53%, which is among the highest efficiencies for as-cast OSCs reported to date. To illustrate the impressive 3-fold PCE enhancement, the chlorination effect on the optical properties and energy levels of polymers, film morphology, and underlying charge dynamics is systematically investigated. Grazing incidence wide-angle X-ray scattering studies show that chlorinated J52-2Cl exhibits strong molecule aggregation, the preferred face-on orientation, and enhanced intermolecular pi-pi interactions, hence increasing the charge carrier mobility by 1 order of magnitude. Moreover, chlorination modifies the miscibility between the donor and acceptor and consequently optimizes the phase separation morphology of J52-2Cl:ITIC blend films. Finallyhese results highlight chlorination as a promising approach to achieve highly efficient as-cast OSCs without any extra treatment.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Wuhan Institute of Technology (WIT)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1491094
- Journal Information:
- Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 24 Vol. 9; ISSN 1948-7185
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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