Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201701552
Keywords
all-polymer solar cells; arrangement effects; polymer side chains; solubility parameters
Categories
Funding
- Office of Naval Research [N00014-14-1-0142]
- Department of Energy, Office of Energy Efficiency & Renewable Energy, Bridging Research Interactions through the collaborative Development Grants in Energy (BRIDGE) program [DE-FOA-0000654-158]
- National Science Foundation Materials Genome Initiative [1434799]
- Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Division Of Materials Research [1434799] Funding Source: National Science Foundation
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The introduction of oligomeric polystyrene (PS) side chains into the conjugated backbone is proven to enhance the processability and electronic properties of semiconducting polymers. Here, two series of donor and acceptor polymers are prepared with different molar percentages of PS side chains to elucidate the effect of their substitution arrangement on the all-polymer solar cell performance. The observed device performance is lower when the PS side chains are substituted on the donor polymer and higher when on the acceptor polymer, indicating a clear arrangement effect of the PS side chain. The incorporation of PS side chains to the acceptor polymer contributes to the decrease in phase separation domain size in the blend films. However, the reduced domain size was still an order of magnitude larger than the typical exciton diffusion length. A detailed morphological study together with the estimation of solubility parameter of the pristine PS, donor, and acceptor polymers reveals that the relative value of solubility parameter of each component dominantly contributes to the purity of the phase separated domain, which strongly impacts the amount of generated photocurrent and overall solar cell performance. This study provides an understanding of the design strategies to improve the all-polymer solar cells.
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