Indium Tin Oxide-Free Tandem Polymer Solar Cells on Opaque Substrates with Top Illumination
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- 作者：Dhritiman Gupta ; Martijn M. Wienk ; Ren茅 A. J. Janssen
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：August 27, 2014
- 年：2014
- 卷：6
- 期：16
- 页码：13937-13944
- 全文大小：431K
- ISSN：1944-8252
文摘
Top-illuminated, indium tin oxide (ITO)-free, tandem polymer solar cells are fabricated on opaque substrates in an inverted device configuration. In the tandem cell, a wide band gap subcell, consisting of poly[N-9鈥?heptadecanyl-2,7-carbazole-alt-5,5-(4鈥?7鈥?di-2-thienyl-2鈥?1鈥?3鈥?benzothiadiazole)] (PCDTBT) blended with [70]PCBM is combined with a small band gap subcell consisting of a mixture of poly[{2,5-bis(2-hexyldecyl)-2,3,5,6-tetrahydro-3,6-dioxopyrrolo[3,4-c]pyrrole-1,4-diyl}-alt-{[2,2鈥?(1,4-phenylene)bisthiophene]-5,5鈥?diyl}] (PDPPTPT) and [60]PCBM. Compared to the more common bottom-illuminated inverted tandem polymer solar cells on transparent ITO substrates, the front and back cells must be reversed when using opaque substrates and a transparent and conductive top contact must be employed to enable top illumination. A high conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer in combination with Ag lines surrounding the active area as current collection electrode is used for this purpose. The tandem polymer solar cell on an opaque glass/metal substrate yields a power conversion efficiency of 6.1% when the thicknesses of the photoactive layers are balanced for optimum performance. This is similar to the equivalent inverted tandem device fabricated on a transparent glass/ITO substrate.