3 years ago

Halide Re-Shelled Quantum Dot Inks for Infrared Photovoltaics

Halide Re-Shelled Quantum Dot Inks for Infrared Photovoltaics
Bin Sun, Sjoerd Hoogland, Larissa Levina, Olivier Ouellette, Oleksandr Voznyy, Min Liu, Rafael Quintero-Bermudez, James Z. Fan, Edward H. Sargent, Mengxia Liu, F. Pelayo García de Arquer
Colloidal quantum dots are promising materials for tandem solar cells that complement silicon and perovskites. These devices are fabricated from solution phase; however, existing methods for making infrared-bandgap CQD inks suffer agglomeration and fusion during solution exchange. Here we develop a ligand exchange that provides robust surface protection and thereby avoids aggregation. First, we exchanged long oleic acid ligands to a mixed system comprising medium-chain ammonium and anionic chloride ligands; we then reshelled the surface using short halides and pseudohalide ligands that enabled transfer to a polar solvent. Absorbance and photoluminescence measurements reveal the retention of exciton sharpness, whereas X-ray photoelectron spectroscopy indicates halide capping. The best power conversion efficiency of these devices is 0.76 power points after filtering through silicon, which is 1.9× higher than previous single-step solution-processed IR-CQD solar cells.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b11449

DOI: 10.1021/acsami.7b11449

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