Broadband solar absorption enhancement via periodic nanostructuring of electrodes.

Michael M Adachi, André J Labelle, Susanna M Thon, Xinzheng Lan, Sjoerd Hoogland, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


Solution processed colloidal quantum dot (CQD) solar cells have great potential for large area low-cost photovoltaics. However, light utilization remains low mainly due to the tradeoff between small carrier transport lengths and longer infrared photon absorption lengths. Here, we demonstrate a bottom-illuminated periodic nanostructured CQD solar cell that enhances broadband absorption without compromising charge extraction efficiency of the device. We use finite difference time domain (FDTD) simulations to study the nanostructure for implementation in a realistic device and then build proof-of-concept nanostructured solar cells, which exhibit a broadband absorption enhancement over the wavelength range of λ = 600 to 1,100 nm, leading to a 31% improvement in overall short-circuit current density compared to a planar device containing an approximately equal volume of active material. Remarkably, the improved current density is achieved using a light-absorber volume less than half that typically used in the best planar devices.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Oct 14 2013
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-11-009-21
Acknowledgements: This publication is based in part on work supported by an award (KUS-11-009-21) from the King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The authors thank E. Palmiano, R. Wolowiec, D. Kopilovic, J. Flexman, J. Ing, and A. Barriere for their support during this work. The authors also thank G. Barber for optical constant measurements for the TiO2 and MoO3 films, and O. Voznyy, J.Y. Kim, I. J. Kramer, C. T. O. Wong, and A. Lee for valuable discussions, and A. Arjmand and N. Lui at Lumerical for technical support. M. M. A. was supported by a MITACS fellowship. X. L. would like to acknowledge a scholarship from the China Scholarship Council (CSC).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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