Abstract
A universal method is reported to form graded bulk heterojunction (BHJ) organic photovoltaic devices (OPVs) by a simple solvent-fluxing process. Donors are enriched at the anode and acceptors are enriched at cathode side, matching the gradient electron and hole current across the film. Efficiency enhancements by 15-50% are achieved for all BHJ systems tested compared with the optimized regular BHJ OPVs.
| Original language | English |
|---|---|
| Pages (from-to) | 3068-3075 |
| Number of pages | 8 |
| Journal | Advanced Materials |
| Volume | 26 |
| Issue number | 19 |
| DOIs | |
| State | Published - May 21 2014 |