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Uncovering buried structure and interfaces in molecular photovoltaics

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Title: Uncovering buried structure and interfaces in molecular photovoltaics
Authors: Gilchrist, JB
Basey-Fisher, TH
Chang, SC
Scheltens, F
McComb, DW
Heutz, S
Item Type: Journal Article
Abstract: The processes that generate current in organic photovoltaics are highly dependent on the micro‐ and nano‐structure in the semiconductor layers, especially at the donor‐acceptor interface. Elucidating film properties throughout the thickness of the devices is therefore key to their further development. Here, a methodology is developed to gain unprecedented insights into the structure and composition of the molecular layers within the depth of device structure using high resolution transmission electron microscopy (HRTEM). The technique was applied to three archetypical solar cell configurations consisting of copper phthalocyanine (CuPc) and C60, which have been cross‐sectioned using a focused ion beam method optimized to minimize sample damage. The HRTEM images exhibit lattice fringes in both CuPc and C60, confirming the crystallinity and texture of both materials, and offering novel insight into the growth of C60 onto molecular materials. The donor‐acceptor interface morphology is further studied using scanning transmission electron microscopy (STEM) in combination with energy dispersive X‐ray (EDX) spectroscopy, extending the scope of our methodology to amorphous heterostructures.
Issue Date: 5-Nov-2014
Date of Acceptance: 1-Aug-2014
URI: http://hdl.handle.net/10044/1/70075
DOI: 10.1002/adfm.201400345
ISSN: 1616-301X
Publisher: Wiley
Start Page: 6473
End Page: 6483
Journal / Book Title: Advanced Functional Materials
Volume: 24
Issue: 41
Copyright Statement: © 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Gilchrist, J. B., Basey‐Fisher, T. H., Chang, S. C., Scheltens, F. , McComb, D. W. and Heutz, S. (2014), Uncovering Buried Structure and Interfaces in Molecular Photovoltaics. Adv. Funct. Mater., 24: 6473-6483., which has been published in final form at https://dx.doi.org/10.1002/adfm.201400345
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/F039948/1
EP/F04139X/1
EP/H002022/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
TRANSMISSION ELECTRON-MICROSCOPY
ORGANIC THIN-FILMS
POLYMER SOLAR-CELLS
COPPER PHTHALOCYANINE
SPECIMEN PREPARATION
SAMPLE PREPARATION
CRYSTAL-STRUCTURE
HETEROJUNCTION
PERFORMANCE
FIB
Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
TRANSMISSION ELECTRON-MICROSCOPY
ORGANIC THIN-FILMS
POLYMER SOLAR-CELLS
COPPER PHTHALOCYANINE
SPECIMEN PREPARATION
SAMPLE PREPARATION
CRYSTAL-STRUCTURE
HETEROJUNCTION
PERFORMANCE
FIB
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Materials
Publication Status: Published
Online Publication Date: 2014-08-22
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering