Systematic Investigation of Benzodithiophene- and Diketopyrrolopyrrole-Based Low-Bandgap Polymers Designed for Single Junction and Tandem Polymer Solar Cells
Top Cited Papers
- 6 June 2012
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 134 (24), 10071-10079
- https://doi.org/10.1021/ja301460s
Abstract
The tandem solar cell architecture is an effective way to harvest a broader part of the solar spectrum and make better use of the photonic energy than the single junction cell. Here, we present the design, synthesis, and characterization of a series of new low bandgap polymers specifically for tandem polymer solar cells. These polymers have a backbone based on the benzodithiophene (BDT) and diketopyrrolopyrrole (DPP) units. Alkylthienyl and alkylphenyl moieties were incorporated onto the BDT unit to form BDTT and BDTP units, respectively; a furan moiety was incorporated onto the DPP unit in place of thiophene to form the FDPP unit. Low bandgap polymers (bandgap = 1.4-1.5 eV) were prepared using BDTT, BDTP, FDPP, and DPP units via Stille-coupling polymerization. These structural modifications lead to polymers with different optical, electrochemical, and electronic properties. Single junction solar cells were fabricated, and the polymer:PC71BM active layer morphology was optimized by adding 1,8-diiodooctane (DIO) as an additive. In the single-layer photovoltaic device, they showed power conversion efficiencies (PCEs) of 3-6%. When the polymers were applied in tandem solar cells, PCEs over 8% were reached, demonstrating their great potential for high efficiency tandem polymer solar cells.This publication has 45 references indexed in Scilit:
- Polymer solar cellsNature Photonics, 2012
- Solar cell efficiency tables (version 39)Progress In Photovoltaics, 2011
- Solar cell efficiency tables (Version 38)Progress In Photovoltaics, 2011
- Polymer solar cells with enhanced open-circuit voltage and efficiencyNature Photonics, 2009
- Synthesis of Conjugated Polymers for Organic Solar Cell ApplicationsChemical Reviews, 2009
- Highly Efficient Solar Cell Polymers Developed via Fine-Tuning of Structural and Electronic PropertiesJournal of the American Chemical Society, 2009
- Fabrication and processing of polymer solar cells: A review of printing and coating techniquesSolar Energy Materials and Solar Cells, 2009
- Efficiency enhancement in low-bandgap polymer solar cells by processing with alkane dithiolsNature Materials, 2007
- High-efficiency solution processable polymer photovoltaic cells by self-organization of polymer blendsNature Materials, 2005
- Plastic Solar CellsAdvanced Functional Materials, 2001