| Improved Current Extraction from ZnO/PbS Quantum Dot Heterojunction Photovoltaics Using a MoO(3) Interfacial Layer. | |
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MedLine Citation:
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PMID: 21661734 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The ability to engineer interfacial energy offsets in photovoltaic devices is one of the keys to their optimization. Here, we demonstrate that improvements in power conversion efficiency may be attained for ZnO/PbS heterojunction quantum dot photovoltaics through the incorporation of a MoO(3) interlayer between the PbS colloidal quantum dot film and the top-contact anode. Through a combination of current-voltage characterization, circuit modeling, Mott-Schottky analysis, and external quantum efficiency measurements performed with bottom- and top-illumination, these enhancements are shown to stem from the elimination of a reverse-bias Schottky diode present at the PbS/anode interface. The incorporation of the high-work-function MoO(3) layer pins the Fermi level of the top contact, effectively decoupling the device performance from the work function of the anode and resulting in a high open-circuit voltage (0.59 ± 0.01 V) for a range of different anode materials. Corresponding increases in short-circuit current and fill factor enable 1.5-fold, 2.3-fold, and 4.5-fold enhancements in photovoltaic device efficiency for gold, silver, and ITO anodes, respectively, and result in a power conversion efficiency of 3.5 ± 0.4% for a device employing a gold anode. |
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Authors:
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Patrick R Brown; Richard R Lunt; Ni Zhao; Timothy P Osedach; Darcy D Wanger; Liang-Yi Chang; Moungi G Bawendi; Vladimir Bulović |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-10 |
Journal Detail:
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Title: Nano letters Volume: - ISSN: 1530-6992 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101088070 Medline TA: Nano Lett Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Physics and ‡Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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