Overcoming the Ambient Manufacturability-Scalability-Performance Bottleneck in Colloidal Quantum Dot Photovoltaics

Abstract
Colloidal quantum dot (CQD) solar cells have risen rapidly in performance; however, their low-cost fabrication under realistic ambient conditions remains elusive. This study uncovers that humid environments curtail the power conversion efficiency (PCE) of solar cells by preventing the needed oxygen doping of the hole transporter during ambient fabrication. A simple oxygen-doping step enabling ambient manufacturing irrespective of seasonal humidity variations is devised. Solar cells with PCE > 10% are printed under high humidity at industrially viable speeds. The devices use a tiny fraction of the ink typically needed and are air stable over a year. The humidity-resilient fabrication of efficient CQD solar cells breaks a long-standing compromise, which should accelerate commercialization.

Citation
Kirmani AR, Sheikh AD, Niazi MR, Haque MA, Liu M, et al. (2018) Overcoming the Ambient Manufacturability-Scalability-Performance Bottleneck in Colloidal Quantum Dot Photovoltaics. Advanced Materials 30: 1801661. Available: http://dx.doi.org/10.1002/adma.201801661.

Acknowledgements
This work was funded by the King Abdullah University of Science and Technology (KAUST) and the Ontario Research Fund Research Excellence Program. A.R.K. would like to acknowledge Dr. Lee J. Richter at the National Institute of Standards and Technology, Maryland, US for fruitful discussions. M.L. acknowledges support from the Hatch Research Scholarship.

Publisher
Wiley

Journal
Advanced Materials

DOI
10.1002/adma.201801661
10.1002/adma.201870260

Additional Links
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201801661

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