Visualization of Current and Mapping of Elements in Quantum Dot Solar Cells

Niezgoda, J. Scott; Ng, Amy; Poplawsky, Jonathan D.; McBride, James R.; Pennycook, Stephen J.; Rosenthal, Sandra J.

doi:10.1002/adfm.201503839

Title: Visualization of Current and Mapping of Elements in Quantum Dot Solar Cells

Journal Article · Thu Dec 17 00:00:00 EST 2015 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201503839· OSTI ID:1261511

Niezgoda, J. Scott ^[1]; Ng, Amy ^[1]; Poplawsky, Jonathan D. ^[2]; McBride, James R. ^[1]; Pennycook, Stephen J. ^[2]; Rosenthal, Sandra J. ^[3]

Vanderbilt Univ., Nashville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The delicate influence of properties such as high surface state density and organic-inorganic boundaries on the individual quantum dot electronic structure complicates pursuits toward forming quantitative models of quantum dot thin films ab initio. Our report describes the application of electron beam-induced current (EBIC) microscopy to depleted-heterojunction colloidal quantum dot photovoltaics (DH-CQD PVs), a technique which affords one a map of current production within the active layer of a PV device. The effects of QD sample size polydispersity as well as layer thickness in CQD active layers as they pertain to current production within these PVs are imaged and explained. The results from these experiments compare well with previous estimations, and confirm the ability of EBIC to function as a valuable empirical tool for the design and betterment of DH-CQD PVs. Lastly, extensive and unexpected PbS QD penetration into the mesoporous TiO₂ layer is observed through imaging of device cross sections by energy-dispersive X-ray spectroscopy combined with scanning transmission electron microscopy. Finally, the effects of this finding are discussed and corroborated with the EBIC studies on similar devices.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; EPS-1004083

OSTI ID:: 1261511

Journal Information:: Advanced Functional Materials, Vol. 26, Issue 6; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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References (23)

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Title: Visualization of Current and Mapping of Elements in Quantum Dot Solar Cells

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