Inverted bulk-heterojunction solar cell with cross-linked hole-blocking layer
Sprache des Titels:
Englisch
Original Kurzfassung:
We have developed a hole-blocking layer for bulk-heterojunction solar cells based on
cross-linked polyethylenimine (PEI). We tested five different ether-based cross-linkers
and found that all of them give comparable solar cell efficiencies. The initial idea that a
cross-linked layer is more solvent resistant compared to a pristine PEI layer could not be
confirmed. With and without cross-linking, the PEI layer sticks very well to the surface
of the indium?tin?oxide electrode and cannot be removed by solvents used to process
PEI or common organic semiconductors. The cross-linked PEI hole-blocking layer functions
for multiple donor?acceptor blends. We found that using cross-linkers improves the
reproducibility of the device fabrication process.