Improving performance of polymer solar cells based on PSBTBT/PC71BM via controlled solvent vapor annealing

- Controlled solvent vapor annealing (C-SVA) was used to optimize morphology for the PSCs based on PSBTBT/PC71BM.
- The PCE is improved from 4.14% for the pristine device to 5.40% for the device under C-SVA treatment.
- The favorable blend composition at the anode interface of C-SVA treated device is beneficial to device performance.