Nanoimprint-Transfer-Patterned Solids Enhance Light Absorption in Colloidal Quantum Dot Solar Cells

Type
Article

Authors
Kim, Younghoon
Bicanic, Kristopher
Tan, Hairen
Ouellette, Olivier
Sutherland, Brandon R.
García de Arquer, F. Pelayo
Jo, Jea Woong
Liu, Mengxia
Sun, Bin
Liu, Min
Hoogland, Sjoerd
Sargent, Edward H.

KAUST Grant Number
KUS-11-009-21

Online Publication Date
2017-03-16

Print Publication Date
2017-04-12

Date
2017-03-16

Abstract
Colloidal quantum dot (CQD) materials are of interest in thin-film solar cells due to their size-tunable bandgap and low-cost solution-processing. However, CQD solar cells suffer from inefficient charge extraction over the film thicknesses required for complete absorption of solar light. Here we show a new strategy to enhance light absorption in CQD solar cells by nanostructuring the CQD film itself at the back interface. We use two-dimensional finite-difference time-domain (FDTD) simulations to study quantitatively the light absorption enhancement in nanostructured back interfaces in CQD solar cells. We implement this experimentally by demonstrating a nanoimprint-transfer-patterning (NTP) process for the fabrication of nanostructured CQD solids with highly ordered patterns. We show that this approach enables a boost in the power conversion efficiency in CQD solar cells primarily due to an increase in short-circuit current density as a result of enhanced absorption through light-trapping.

Citation
Kim Y, Bicanic K, Tan H, Ouellette O, Sutherland BR, et al. (2017) Nanoimprint-Transfer-Patterned Solids Enhance Light Absorption in Colloidal Quantum Dot Solar Cells. Nano Letters 17: 2349–2353. Available: http://dx.doi.org/10.1021/acs.nanolett.6b05241.

Acknowledgements
This publication was based in part on work supported by Award KUS-11-009-21, made by 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. H.T. acknowledges The Netherlands Organisation for Scientific Research (NWO) for a Rubicon Grant (680-50-1511) to support his postdoctoral research at University of Toronto. This work was also carried out under Qatar National Research Fund (QNRF) project NPRP-8-086-1-017. The authors thank L. Levina, R. Wolowiec, D. Kopilovic, and E. Palmiano for their technical help over the course of this research. O.O. received financial support from the Fonds de Recherche du Québec – Nature et Technologies (FRQNT).

Publisher
American Chemical Society (ACS)

Journal
Nano Letters

DOI
10.1021/acs.nanolett.6b05241

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