Interfacial Segregation in Polymer/Fullerene Blend Films for Photovoltaic Devices
It has recently been shown that surface energy effects can cause selective segregation at the active layer interfaces of a bulk heterojunction (BHJ) organic photovoltaic device. The active layer interface composition has been suggested to impact device performance. In this study changes in the BHJ v...
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| Veröffentlicht in: | Macromolecules 2010-04, Vol.43 (8), p.3828-3836 |
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| container_end_page | 3836 |
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| container_issue | 8 |
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| container_title | Macromolecules |
| container_volume | 43 |
| creator | Germack, David S Chan, Calvin K Kline, R. Joseph Fischer, Daniel A Gundlach, David J Toney, Michael F Richter, Lee J DeLongchamp, Dean M |
| description | It has recently been shown that surface energy effects can cause selective segregation at the active layer interfaces of a bulk heterojunction (BHJ) organic photovoltaic device. The active layer interface composition has been suggested to impact device performance. In this study changes in the BHJ vertical composition profile of BHJ active layers cast on two hole transport layers (HTL) with significantly different surface energies (γ) are characterized using spectroscopic ellipsometry and near-edge X-ray absorption fine structure spectroscopy. Changes in the HTL γ are shown to significantly affect the BHJ interfacial segregation at the buried interface near the HTL while the composition near the free surface (air) of the BHJ is unaffected. Despite the significant differences in vertical segregation at the HTL interface, the performances of the resulting organic photovoltaic devices were relatively similar. |
| doi_str_mv | 10.1021/ma100027b |
| format | Article |
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Joseph ; Fischer, Daniel A ; Gundlach, David J ; Toney, Michael F ; Richter, Lee J ; DeLongchamp, Dean M</creator><creatorcontrib>Germack, David S ; Chan, Calvin K ; Kline, R. Joseph ; Fischer, Daniel A ; Gundlach, David J ; Toney, Michael F ; Richter, Lee J ; DeLongchamp, Dean M ; Brookhaven National Laboratory (BNL) National Synchrotron Light Source</creatorcontrib><description>It has recently been shown that surface energy effects can cause selective segregation at the active layer interfaces of a bulk heterojunction (BHJ) organic photovoltaic device. The active layer interface composition has been suggested to impact device performance. In this study changes in the BHJ vertical composition profile of BHJ active layers cast on two hole transport layers (HTL) with significantly different surface energies (γ) are characterized using spectroscopic ellipsometry and near-edge X-ray absorption fine structure spectroscopy. Changes in the HTL γ are shown to significantly affect the BHJ interfacial segregation at the buried interface near the HTL while the composition near the free surface (air) of the BHJ is unaffected. Despite the significant differences in vertical segregation at the HTL interface, the performances of the resulting organic photovoltaic devices were relatively similar.</description><identifier>ISSN: 0024-9297</identifier><identifier>EISSN: 1520-5835</identifier><identifier>DOI: 10.1021/ma100027b</identifier><identifier>CODEN: MAMOBX</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>ABSORPTION ; AIR ; Application fields ; Applied sciences ; ELLIPSOMETRY ; Energy ; Exact sciences and technology ; FINE STRUCTURE ; HETEROJUNCTIONS ; MATERIALS SCIENCE ; national synchrotron light source ; Natural energy ; Photovoltaic conversion ; Polymer industry, paints, wood ; SEGREGATION ; Solar cells. 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Despite the significant differences in vertical segregation at the HTL interface, the performances of the resulting organic photovoltaic devices were relatively similar.</description><subject>ABSORPTION</subject><subject>AIR</subject><subject>Application fields</subject><subject>Applied sciences</subject><subject>ELLIPSOMETRY</subject><subject>Energy</subject><subject>Exact sciences and technology</subject><subject>FINE STRUCTURE</subject><subject>HETEROJUNCTIONS</subject><subject>MATERIALS SCIENCE</subject><subject>national synchrotron light source</subject><subject>Natural energy</subject><subject>Photovoltaic conversion</subject><subject>Polymer industry, paints, wood</subject><subject>SEGREGATION</subject><subject>Solar cells. 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| subjects | ABSORPTION AIR Application fields Applied sciences ELLIPSOMETRY Energy Exact sciences and technology FINE STRUCTURE HETEROJUNCTIONS MATERIALS SCIENCE national synchrotron light source Natural energy Photovoltaic conversion Polymer industry, paints, wood SEGREGATION Solar cells. Photoelectrochemical cells Solar energy SPECTROSCOPY SURFACE ENERGY Technology of polymers TRANSPORT |
| title | Interfacial Segregation in Polymer/Fullerene Blend Films for Photovoltaic Devices |
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