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Deshmukh, Kedar D.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2018Tuning the Molecular Weight of the Electron Accepting Polymer in All-Polymer Solar Cellscitations
- 2018Impact of Acceptor Fluorination on the Performance of All-Polymer Solar Cellscitations
- 2017Critical Role of Pendant Group Substitution on the Performance of Efficient All-Polymer Solar Cellscitations
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article
Tuning the Molecular Weight of the Electron Accepting Polymer in All-Polymer Solar Cells
Abstract
<p>Molecular weight is an important factor determining the morphology and performance of all-polymer solar cells. Through the application of direct arylation polycondention, a series of batches of a fluorinated naphthalene diimide-based acceptor polymer are prepared with molecular weight varying from M<sub>n</sub> = 20 to 167 kDa. Used in conjunction with a common low bandgap donor polymer, the effect of acceptor molecular weight on solar cell performance, morphology, charge generation, and transport is explored. Increasing the molecular weight of the acceptor from M<sub>n</sub> = 20 to 87 kDa is found to increase cell efficiency from 2.3% to 5.4% due to improved charge separation and transport. Further increasing the molecular weight to M<sub>n</sub> = 167 kDa however is found to produce a drop in performance to 3% due to liquid–liquid phase separation which produces coarse domains, poor charge generation, and collection. In addition to device studies, a systematic investigation of the microstructure and photophysics of this system is presented using a combination of transmission electron microscopy, grazing-incidence wide-angle X-ray scattering, near-edge X-ray absorption fine-structure spectroscopy, photoluminescence quenching, and transient absorption spectroscopy to provide a comprehensive understanding of the interplay between morphology, photophysics, and photovoltaic performance.</p>