Vertically Oriented Carbon Nanostructures and Their Application Potential for Polymer-Based Solar Cells
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- 作者：Holger Borchert ; Florian Witt ; Alina Chanaewa ; Fabian Werner ; Jan Dorn ; Thomas Dufaux ; Marta Kruszynska ; Anne Jandke ; Michael H枚ltig ; Tamara Alfere ; Jens B枚ttcher ; Christoph Gimmler ; Christian Klinke ; Marko Burghard ; Alf Mews ; Horst Weller ; J眉rgen Parisi
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：January 12, 2012
- 年：2012
- 卷：116
- 期：1
- 页码：412-419
- 全文大小：492K
- 年卷期：v.116,no.1(January 12, 2012)
- ISSN：1932-7455
文摘
One factor limiting the performance of polymer-based bulk heterojunction solar cells is inefficient charge transport in the disordered donor/acceptor blends. The incorporation of carbon nanotubes (CNTs) into the active layer is considered as a promising concept to improve charge transport toward the electrodes. Whereas disordered ternary blends of polymer, fullerenes and CNTs, were already examined in the past, there is much less work on ordered vertically oriented arrays of nanotubes for solar cell applications. We focused on the fabrication of corresponding arrays with spatial dimensions that are suitable for application in polymer-based solar cells. We demonstrate in this contribution that CNTs can be grown on ITO covered glass at temperatures below 600 掳C by static pressure chemical vapor deposition (CVD). Using short growth times, we were able to obtain CNT arrays with a rather uniform length limited to about 200 nm. With a plasma-enhanced CVD process, we were also able to produce wall-like carbon nanostructures (multilayered graphene sheets) with controllable height on ITO. Both types of carbon nanostructures were investigated in test solar cells, in order to explore their suitability for application in organic photovoltaics. Efficiencies remained low so far (0.2%), but the successful incorporation of the new ordered structures into solar cells could be demonstrated, and issues for further optimization are discussed.