ORGANIC ELECTRONIC DEVICES AND POLYMERS, INCLUDING PHOTOVOLTAIC CELLS AND DIKETONE-BASED POLYMERS
申请人:Brown Christopher T.
公开号:US20110204341A1
公开(公告)日:2011-08-25
Polymers which can be used in p-type materials for organic electronic devices and photovoltaic cells. Compounds, monomers, dimers, trimers, and polymers comprising:
Good photovoltaic efficiency and lifetime can be achieved. The R group can provide solubility, environmental stability, and fine tuning of spectroscopic and/or electronic properties. Different polymer microstructures can be prepared which encourage multiple band gaps and broad and strong absorptions. The carbonyl can interact with adjacent thiophene rings to provide backbone with rigidity, induce planarity, and reduce and/or eliminate intramolecular chain twisting defects. Polymers comprising benzodithiophene and/or benzothiadiazole structures can show particularly high performance.
[EN] ORGANIC ELECTRONIC DEVICES AND POLYMERS, INCLUDING PHOTOVOLTAIC CELLS AND DIKETONE-BASED POLYMERS<br/>[FR] POLYMÈRES ET DISPOSITIFS ORGANIQUES ÉLECTRIQUES, COMPRENANT DES CELLULES PHOTOVOLTAÏQUES ET DES POLYMÈRES À BASE DE DICÉTONE
申请人:PLEXTRONICS INC
公开号:WO2011028827A3
公开(公告)日:2011-05-26
Enhanced Photovoltaic Performance of Amorphous Copolymers Based on Dithienosilole and Dioxocycloalkene-annelated Thiophene
Organic photovoltaics (OPVs) have attracted considerable attention due to their potential for generating renewable energy. The power conversion efficiency (PCE) of the OPVs largely depends on the organic semiconducting materials. Thus, the elucidation of structureproperty OPV performance relationships is important for the rational improvement of OPVs. Here, low-bandgap copolymers comprising dithieno[3,2-b:2',3'-d]silole as a donor unit and dialkyl-substituted naphtho[2,3-c]thiophene-4,9-dione as an acceptor unit were synthesized to investigate the influence of the polymer molecular weight and the alkyl chain length in the acceptor unit on the polymer properties and photovoltaic performance. All the prepared copolymers are amorphous in the solid state. Both the increase of polymer molecular weight and variation of the alkyl side chains in the acceptor unit subtly affected molecular properties. However, these structural modifications showed significant impact on the photovoltaic performance in bulk heterojunction (BHJ) solar cells based on copolymer/[6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM), with PCEs that range between 2.35 and 5.21%. Furthermore, the optimization of thin-film fabrication by use of a ternary solvent system led to the appearance of improved morphology accompanied by subtly ordered states of the copolymer in the BHJ films and, hence, improved carrier mobility and charge-separation efficiency. Consequently, the BHJ solar cell can achieve a PCE of 7.85%, which is the highest performance among the amorphous copolymers in the conventional device structure. This result highlights the importance of fine-tuning both the molecular structure and device fabrication in the construction of high-performance organic photovoltaics based on amorphous copolymers and PC71BM.
US8968885B2
申请人:——
公开号:US8968885B2
公开(公告)日:2015-03-03
Enhanced photovoltaic effect from naphtho[2,3-<i>c</i>]thiophene-4,9-dione-based polymers through alkyl side chain induced backbone distortion