Tandem Solar Cells from Accessible Low Band-Gap Polymers Using an Efficient Interconnecting Layer

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• 作者：Santanu Bag ; Romesh J. Patel ; Ajaykumar Bunha ; Caroline Grand ; J. Daniel Berrigan ; Matthew J. Dalton ; Benjamin J. Leever ; John R. Reynolds ; Michael F. Durstock
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：8
• 期：1
• 页码：16-19
• 全文大小：284K
• ISSN：1944-8252

文摘

Tandem solar cell architectures are designed to improve device photoresponse by enabling the capture of wider range of solar spectrum as compared to single-junction device. However, the practical realization of this concept in bulk-heterojunction polymer systems requires the judicious design of a transparent interconnecting layer compatible with both polymers. Moreover, the polymers selected should be readily synthesized at large scale (>1 kg) and high performance. In this work, we demonstrate a novel tandem polymer solar cell that combines low band gap poly isoindigo [P(T3-iI)-2], which is easily synthesized in kilogram quantities, with a novel Cr/MoO₃ interconnecting layer. Cr/MoO₃ is shown to be greater than 80% transparent above 375 nm and an efficient interconnecting layer for P(T3-iI)-2 and PCDTBT, leading to 6% power conversion efficiencies under AM 1.5G illumination. These results serve to extend the range of interconnecting layer materials for tandem cell fabrication by establishing, for the first time, that a thin, evaporated layer of Cr/MoO₃ can work as an effective interconnecting layer in a tandem polymer solar cells made with scalable photoactive materials.