All-Polymer Solar Cells Employing Non-Halogenated Solvent and Additive

Herein, we report an all-polymer solar cell with a PCE of over 5% fabricated with non-halogenated solvent. Our method of polymer side-chain engineering using polystyrene enhanced the solubility of polymers in toluene. The phase separation size of the polymer-polymer blend was controlled by tuning the additive concentration. Three different additives were employed and studied. To the best of our knowledge, this is the highest performing all-polymer solar cell fabricated with both non halogenated solvent and non-halogenated additive, which highlights its potential toward environmentally friendly manufacturing of all polymer organic solar cells.DOE EERE [DE-EE0005960]; Department of Defense (DoD) through National Defense Science & Engineering Graduate Fellowship (NDSEG) Program; Office of Navy Research [N00014-14-1-0142]; National Science Foundation Materials Genome Program [1434799]; National Natural Science Foundation of China [51473003]; 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]SCI(E)EIARTICLEzbao@stanford.edu145037-50422