Cargando…
Identifying Molecular Orientation in a Bulk Heterojunction Film by Infrared Reflection Absorption Spectroscopy
[Image: see text] The molecular orientation of organic molecules of zinc phthalocyanine (ZnPc) in single-component films on copper iodide (CuI) substrates can be controlled to achieve a molecular orientation lying flat on the substrate (flat-on) owing to π–d orbital interactions between the ZnPc mol...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2018
|
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641761/ https://www.ncbi.nlm.nih.gov/pubmed/31458767 http://dx.doi.org/10.1021/acsomega.8b00099 |
_version_ | 1783436848382607360 |
---|---|
author | Chikamatsu, Tatsuki Shahiduzzaman, Md. Yamamoto, Kohei Karakawa, Makoto Kuwabara, Takayuki Takahashi, Kohshin Taima, Tetsuya |
author_facet | Chikamatsu, Tatsuki Shahiduzzaman, Md. Yamamoto, Kohei Karakawa, Makoto Kuwabara, Takayuki Takahashi, Kohshin Taima, Tetsuya |
author_sort | Chikamatsu, Tatsuki |
collection | PubMed |
description | [Image: see text] The molecular orientation of organic molecules of zinc phthalocyanine (ZnPc) in single-component films on copper iodide (CuI) substrates can be controlled to achieve a molecular orientation lying flat on the substrate (flat-on) owing to π–d orbital interactions between the ZnPc molecules and the CuI. A 3-fold enhancement in the performance of organic photovoltaic cells has been reported by introducing a CuI interlayer between a ZnPc:fullerene (C60) bulk heterojunction (BHJ) film and the substrate. However, the mechanism underpinning the resultant solar cell performance enhancement was unclear. Herein, we report on the results of using in situ reflection absorption spectroscopy measurements during the vacuum deposition of coevaporated ZnPc:C60 BHJ films on various substrates to investigate the ZnPc molecular orientation. Our results revealed that the flat-on molecular orientation of ZnPc molecules in ZnPc:C60 BHJ films on CuI interlayers and flat-on ZnPc substrates can be successfully identified via the strong π–π interactions between the BHJ film and the substrate. The π–π interactions between individual ZnPc molecules are stronger than the π–d interactions between ZnPc molecules and CuI in coevaporated ZnPc:C60 films, as is evident from the molecular orientation of ZnPc, as determined by in situ reflection absorption spectroscopy. Our findings demonstrate that precisely controlling the molecular orientations of the films could enhance organic photovoltaic (OPV) performance. The present work provides important insights that will enable the design of higher performance OPV cells. |
format | Online Article Text |
id | pubmed-6641761 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66417612019-08-27 Identifying Molecular Orientation in a Bulk Heterojunction Film by Infrared Reflection Absorption Spectroscopy Chikamatsu, Tatsuki Shahiduzzaman, Md. Yamamoto, Kohei Karakawa, Makoto Kuwabara, Takayuki Takahashi, Kohshin Taima, Tetsuya ACS Omega [Image: see text] The molecular orientation of organic molecules of zinc phthalocyanine (ZnPc) in single-component films on copper iodide (CuI) substrates can be controlled to achieve a molecular orientation lying flat on the substrate (flat-on) owing to π–d orbital interactions between the ZnPc molecules and the CuI. A 3-fold enhancement in the performance of organic photovoltaic cells has been reported by introducing a CuI interlayer between a ZnPc:fullerene (C60) bulk heterojunction (BHJ) film and the substrate. However, the mechanism underpinning the resultant solar cell performance enhancement was unclear. Herein, we report on the results of using in situ reflection absorption spectroscopy measurements during the vacuum deposition of coevaporated ZnPc:C60 BHJ films on various substrates to investigate the ZnPc molecular orientation. Our results revealed that the flat-on molecular orientation of ZnPc molecules in ZnPc:C60 BHJ films on CuI interlayers and flat-on ZnPc substrates can be successfully identified via the strong π–π interactions between the BHJ film and the substrate. The π–π interactions between individual ZnPc molecules are stronger than the π–d interactions between ZnPc molecules and CuI in coevaporated ZnPc:C60 films, as is evident from the molecular orientation of ZnPc, as determined by in situ reflection absorption spectroscopy. Our findings demonstrate that precisely controlling the molecular orientations of the films could enhance organic photovoltaic (OPV) performance. The present work provides important insights that will enable the design of higher performance OPV cells. American Chemical Society 2018-05-25 /pmc/articles/PMC6641761/ /pubmed/31458767 http://dx.doi.org/10.1021/acsomega.8b00099 Text en Copyright © 2018 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Chikamatsu, Tatsuki Shahiduzzaman, Md. Yamamoto, Kohei Karakawa, Makoto Kuwabara, Takayuki Takahashi, Kohshin Taima, Tetsuya Identifying Molecular Orientation in a Bulk Heterojunction Film by Infrared Reflection Absorption Spectroscopy |
title | Identifying Molecular Orientation in a Bulk Heterojunction
Film by Infrared Reflection Absorption Spectroscopy |
title_full | Identifying Molecular Orientation in a Bulk Heterojunction
Film by Infrared Reflection Absorption Spectroscopy |
title_fullStr | Identifying Molecular Orientation in a Bulk Heterojunction
Film by Infrared Reflection Absorption Spectroscopy |
title_full_unstemmed | Identifying Molecular Orientation in a Bulk Heterojunction
Film by Infrared Reflection Absorption Spectroscopy |
title_short | Identifying Molecular Orientation in a Bulk Heterojunction
Film by Infrared Reflection Absorption Spectroscopy |
title_sort | identifying molecular orientation in a bulk heterojunction
film by infrared reflection absorption spectroscopy |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641761/ https://www.ncbi.nlm.nih.gov/pubmed/31458767 http://dx.doi.org/10.1021/acsomega.8b00099 |
work_keys_str_mv | AT chikamatsutatsuki identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy AT shahiduzzamanmd identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy AT yamamotokohei identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy AT karakawamakoto identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy AT kuwabaratakayuki identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy AT takahashikohshin identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy AT taimatetsuya identifyingmolecularorientationinabulkheterojunctionfilmbyinfraredreflectionabsorptionspectroscopy |