Highly Efficient Flexible Quantum Dot Solar Cells
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Posted On: 08/02/2017 8:51:49 AM
Highly Efficient Flexible Quantum Dot Solar Cells with Improved Electron Extraction Using MgZnO Nanocrystals
Xiaoliang Zhang, Pralay Kanti Santra, Lei Tian, Malin B. Johansson, Håkan Rensmo, and Erik M. J. Johansson
ACS Nano, Just Accepted Manuscript
DOI: 10.1021/acsnano.7b04332
Publication Date (Web): August 1, 2017
Copyright © 2017 American Chemical Society
Abstract
Colloidal quantum dot (CQD) materials have high potential for realizing efficient, lightweight and flexible solar cells. To achieve highly efficient and flexible CQD solar cells, the electron transport layer (ETL), extracting electrons from the CQD solid layer, needs to be processed at a low-temperature and should also suppress interfacial recombination. Herein, a highly stable MgZnO nanocrystal (MZO-NC) layer is reported for efficient flexible PbS CQD solar cells. Solar cells fabricated with MZO-NC ETL give high power conversion efficiency (PCE) of 10.4% and 9.4%, on glass and flexible plastic substrates, respectively. The reported flexible CQD solar cell has the record efficiency to date of flexible CQD solar cells. Detailed theoretical simulations and extensive characterizations reveal that the MZO-NCs significantly enhance charge extraction from the CQD solid and diminish the charge accumulation at the ETL/CQD interface, suppressing charge interfacial recombination. These important results suggest that the low-temperature processed MZO-NCs are very promising for use in efficient flexible solar cells or other flexible optoelectronic devices.
http://pubs.acs.org/doi/abs/10.1021/acsnano.7b04332
Xiaoliang Zhang, Pralay Kanti Santra, Lei Tian, Malin B. Johansson, Håkan Rensmo, and Erik M. J. Johansson
ACS Nano, Just Accepted Manuscript
DOI: 10.1021/acsnano.7b04332
Publication Date (Web): August 1, 2017
Copyright © 2017 American Chemical Society
Abstract
Colloidal quantum dot (CQD) materials have high potential for realizing efficient, lightweight and flexible solar cells. To achieve highly efficient and flexible CQD solar cells, the electron transport layer (ETL), extracting electrons from the CQD solid layer, needs to be processed at a low-temperature and should also suppress interfacial recombination. Herein, a highly stable MgZnO nanocrystal (MZO-NC) layer is reported for efficient flexible PbS CQD solar cells. Solar cells fabricated with MZO-NC ETL give high power conversion efficiency (PCE) of 10.4% and 9.4%, on glass and flexible plastic substrates, respectively. The reported flexible CQD solar cell has the record efficiency to date of flexible CQD solar cells. Detailed theoretical simulations and extensive characterizations reveal that the MZO-NCs significantly enhance charge extraction from the CQD solid and diminish the charge accumulation at the ETL/CQD interface, suppressing charge interfacial recombination. These important results suggest that the low-temperature processed MZO-NCs are very promising for use in efficient flexible solar cells or other flexible optoelectronic devices.
http://pubs.acs.org/doi/abs/10.1021/acsnano.7b04332
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