Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 20, Pages 10660-10665Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00930h
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Funding
- National Natural Science Foundation of China [21374120, 61377029]
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The interlayer inserted between the active layer and ITO has been demonstrated to be crucial for the performance of inverted polymer solar cells (i-PSCs). In this work, we find that ionic liquids (ILs) can significantly enhance the efficiency of i-PSCs. With the ZnO/IL interfacial layer, PTB7-Th : PC71BM i-PSCs can exhibit a champion power conversion efficiency (PCE) of 10.15%, which is among the highest PCEs reported thus far for single-junction bulk heterojunction solar cells through the solution process. The IL layer and ZnO/IL combination layer with low work function, good optical transmittance, improved electron extraction and reduced resistance at the cathode interface have been demonstrated to be excellent and general interfacial layers for i-PSCs.
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