Strong Enhanced Efficiency of NaturalAlginate for Polymer Solar Cells throughModifying ZnO Cathode Buffer Layer
2020
Sodium alginate (SA), as a natural marine biopolymer, possesses many
merits such as super-easy accessibility from the ocean, low cost,
nontoxicity, and no synthesis for practical application. For the chemical
structure, SA has enough lone electron pairs of oxygen atoms in the
backbone and short branched chains, which is expected to passivate oxygen
vacancy on the surface of the ZnO cathode buffer layer to improve the
photovoltaic performance. Herein, it was applied to modify the surface
trap of the ZnO layer in fullerene and non-fullerene polymer solar cells
(PSCs). The defects were successfully reduced, and the trap-assisted
recombination decreased. In a
PTB7-Th:PC71BM system, power
conversion efficiency (PCE) was improved from 8.06% to 9.36%. In the
PM6:IT-4F system, PCE was enhanced from 12.13% to 13.08%. The addition of
SA did not destroy the stability of the device. Overall, this work
demonstrates the potential for preparing devices with long-time stability
and industrial manufacture of PSCs by using biological materials in the
future.
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