Semiconducting Polymers Based on Isoindigo and Its Derivatives: Synthetic Tactics, Structural Modifications, and Applications

Third-generation solar cells, including dye-sensitized solar cells, bulk-heterojunction solar cells, and perovskite solar cells, are being intensively researched to obtain high efficiencies in converting solar energy into electricity. However, it is also important to note their stability over time and the devices’ thermal or operating temperature range. Today’s widely used polymeric materials are also used at various stages of the preparation of the complete device—it is worth mentioning that in dye-sensitized solar cells, suitable polymers can be used as flexible substrates counter-electrodes, gel electrolytes, and even dyes. In the case of bulk-heterojunction solar cells, they are used primarily as donor materials; however, there are reports in the literature of their use as acceptors. In perovskite devices, they are used as additives to improve the morphology of the perovskite, mainly as hole transport materials and also as additives to electron transport layers. Polymers, thanks to their numerous advantages, such as the possibility of practically any modification of their chemical structure and thus their physical and chemical properties, are increasingly used in devices that convert solar radiation into electrical energy, which is presented in this paper.

/pdf/polymers-in-high-efficiency-solar-cells-the-latest-reports-24xis4q3.pdf

Polymers in High-Efficiency Solar Cells: The Latest Reports

Quantification of Photophysical Processes in All-polymer Bulk Heterojunction Solar Cells Ahmed H. Balawi, Zhipeng Kan, Julien Gorenflot,* Paola Guarracino, Neha Chaturvedi, Alberto Privitera, Shengjian Liu, Yajun Gao, Lorenzo Franco, Pierre Beaujuge, and Frédéric Laquai* Dr. A. H. Balawi, Dr. Z. Kan, Dr. J. Gorenflot, Dr. N. Chaturvedi, Dr. S. Liu, Dr. Y. Gao, Prof. P. Beaujuge, Prof. F. Laquai Materials Science and Engineering Program (MSE), Physical Sciences and Engineering Division (PSE), KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia. E-mail: frederic.laquai@kaust.edu.sa; julien.gorenflot@kaust.edu.sa Dr. P. Guarracino, Dr. A. Privitera, Prof. L. Franco Department of Chemical Sciences, University of Padua, via Marzolo 1, 35131 Padua, Italy. Prof. Z. Kan Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China. Prof. S. Liu School of Chemistry Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangdong Provincial Engineering Technology Research Center for Materials for Energy Conversion and Storage, South China Normal University, Guanghzou, 510006, P. R. China.

/pdf/quantification-of-photophysical-processes-in-all-polymer-1c2ntv36wb.pdf

Quantification of Photophysical Processes in All-Polymer Bulk Heterojunction Solar Cells

Structure modification of isoindigo copolymer synthesized by direct arylation that improves the open circuit voltage on organic solar cells

Polymer acceptors are a class of “non‐fullerene” electron‐transporting materials that can replace [6,6]‐phenyl C61/71 butyric acid (PC61/71BM) in bulk‐heterojunction (BHJ) solar cells. In this contribution is reported the use of N‐acyl‐substituted isoindigo (IID) motifs (IID(CO)) as electron‐deficient units in the design of polymer acceptors for “all‐polymer” BHJ solar cells. While IID motifs are commonly used in the design of polymer donors for efficient BHJ solar cells with the fullerene PC61/71BM acceptors, here it is shown that IID(CO) building units used in conjunction with suitable co‐monomers represent a practical avenue for polymer acceptors with electron affinity values comparable to that of PC61/71BM (i.e., 4.2 eV).

N ‐Acylisoindigo Derivatives as Polymer Acceptors for “All‐Polymer” Bulk‐Heterojunction Solar Cells

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N ‐Acylisoindigo Derivatives as Polymer Acceptors for “All‐Polymer” Bulk‐Heterojunction Solar Cells