Abstract
We report an open circuit voltage (VOC) increase by physical pressing of all-polymer solar cells with bulk heterojunction (BHJ) films of poly(3-hexylthiophene) and poly(9,9-dioctylfluorene-co-benzothiadiazole). When compression force was applied in the direction normal to the BHJ film plane, VOC was increased for all-polymer solar cells with a lithium fluoride (LiF) nanolayer (∼1 nm thick) between the BHJ and cathode layers. However, VOC was rather decreased for all-polymer solar cells without the LiF layer upon compression. Interestingly, the VOC change (both increase and decrease) was linearly proportional to the intensity of pressing (compression) forces. The reason for the VOC increase in the device with the LiF layer has been assigned to the improved LiF dipole alignment and interfacial contacts during rearrangement of the nanolayer (LiF) nanomorphology upon pressing.
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