Abstract
Interlayer materials play an important role in the rapid development of organic solar cells (OSCs). State-of-the-art interlayers in fullerene OSCs may be not the best choice for fullerene-free OSCs, thus new interlayers need to be developed. Here, we report high performance fullerene-free OSCs with efficiency over 12% by using low temperature (150 oC) solution processed EDTA-ZnO hybrid interlayer. The performance improvement can be attributed to the dual nature of EDTA. First, EDTA itself shows good ability in interface modification as an interlayer, leading to 10% device efficiency. Second, when combined with ZnO, EDTA can passivize defects in ZnO film due to its chelation function, leading to balanced hole and electron mobility in OSCs. As a result, high internal quantum efficiency (IQE) approaching 100% is achieved in the range from 480 nm to 720 nm. The remarkable IQE means that in OSCs with EDTA-ZnO, every absorbed photon can generate a separated pair of charged carriers and that almost all photo-gen...
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