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Enhancement of the performance of GaP solar cells by embedded In(N)P quantum dots

Kuang, Yanjin and Sun, Ke and Sukrittanon, Supanee and Takabayashi, Ko and Kamiya, Itaru and Lewis, Nathan S. and Tu, Charles W. (2015) Enhancement of the performance of GaP solar cells by embedded In(N)P quantum dots. Nano Energy, 15 . pp. 782-788. ISSN 2211-2855. https://resolver.caltech.edu/CaltechAUTHORS:20151204-091530978

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Abstract

Improving the utilization of solar spectra of wide bandgap semiconductors that can potentially provide enough free energy is one of the promising strategies for realizing efficient and spontaneous integrated conversion of solar energy to chemical fuels. We demonstrate herein that nitrogen doped InP quantum dots (QDs) embedded in wide bandgap GaP could improve the solar energy conversion performance. Photoelectrochemical experiments in contact with a nonaqueous, reversible redox couple indicated that the QD-embedded devices exhibited improved performance relative to devices without QDs, with short-circuit current densities increasing from 0.16 mA cm^(−2) for GaP-only devices to 0.23 and 0.29 mA cm^(−2) for InP and InNP QD-embedded devices, respectively. Additionally, the open-circuit voltages increased from 0.95 V for GaP-only devices to 1.11 and 1.14 V for InP and InNP QD-embedded devices, respectively, and the external quantum yield of the devices was also enhanced by the embedded QDs. The improvement is attributed to the absorption of sub-bandgap photons by the In(N)P QDs.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.nanoen.2015.06.003DOIArticle
http://www.sciencedirect.com/science/article/pii/S2211285515002578PublisherArticle
ORCID:
AuthorORCID
Sun, Ke0000-0001-8209-364X
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2015 Elsevier. Received 3 February 2015, Revised 18 May 2015, Accepted 8 June 2015, Available online 17 June 2015.
Group:Kavli Nanoscience Institute, JCAP
Subject Keywords:Quantum dots; InNP; Solar cells; Indirect bandgap engineering; MBE
Record Number:CaltechAUTHORS:20151204-091530978
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151204-091530978
Official Citation:Yanjin Kuang, Ke Sun, Supanee Sukrittanon, Ko Takabayashi, Itaru Kamiya, Nathan S. Lewis, Charles W. Tu, Enhancement of the performance of GaP solar cells by embedded In(N)P quantum dots, Nano Energy, Volume 15, July 2015, Pages 782-788, ISSN 2211-2855, http://dx.doi.org/10.1016/j.nanoen.2015.06.003. (http://www.sciencedirect.com/science/article/pii/S2211285515002578)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62602
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Dec 2015 17:22
Last Modified:03 Oct 2019 09:20

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