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Low-Bandgap Near-IR Conjugated Polymers/Molecules for Organic Electronics

Advances in the design and application of highly efficient conjugated polymers and small molecules over the past years have enabled the rapid progress in the development of organic photovoltaic (OPV) technology as a promising alternative to conventional solar cells. Among the numerous OPV materials, benzodithiophene (BDT)-based polymers and small molecules have come to the fore in achieving outstanding power conversion efficiency (PCE) and breaking 10% efficiency barrier in the single junction OPV devices. Remarkably, the OPV device featured by BDT-based polymer has recently demonstrated an impressive PCE of 11.21%, indicating the great potential of this class of materials in commercial photovoltaic applications. In this review, we offered an overview of the organic photovoltaic materials based on BDT from the aspects of backbones, functional groups, alkyl chains, and device performance, trying to provide a guideline about the structure-performance relationship. We believe more exciting BDT-based photovol...

Molecular Design of Benzodithiophene-Based Organic Photovoltaic Materials.

Xugang Guo,*,† Antonio Facchetti,*,‡,§ and Tobin J. Marks*,‡ †Department of Materials Science and Engineering, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong 518055, China ‡Department of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States Polyera Corporation, 8045 Lamon Avenue, Skokie, Illinois 60077, United States

Imide- and Amide-Functionalized Polymer Semiconductors

Low bandgap n-type organic semiconductor (n-OS) ITIC has attracted great attention for the application as an acceptor with medium bandgap p-type conjugated polymer as donor in nonfullerene polymer solar cells (PSCs) because of its attractive photovoltaic performance. Here we report a modification on the molecular structure of ITIC by side-chain isomerization with meta-alkyl-phenyl substitution, m-ITIC, to further improve its photovoltaic performance. In a comparison with its isomeric counterpart ITIC with para-alkyl-phenyl substitution, m-ITIC shows a higher film absorption coefficient, a larger crystalline coherence, and higher electron mobility. These inherent advantages of m-ITIC resulted in a higher power conversion efficiency (PCE) of 11.77% for the nonfullerene PSCs with m-ITIC as acceptor and a medium bandgap polymer J61 as donor, which is significantly improved over that (10.57%) of the corresponding devices with ITIC as acceptor. To the best of our knowledge, the PCE of 11.77% is one of the highe...

Side-Chain Isomerization on an n-type Organic Semiconductor ITIC Acceptor Makes 11.77% High Efficiency Polymer Solar Cells

A series of triple bond side-chained benzodithiophene copolymers, derived from 4,8-bis(1-ethynyl-3,5-bis(octyloxy)phenyl)-benzo[1,2-b:4,5-b′]dithiophene, were synthesized by Stille coupling reactions. Several electron acceptors are introduced into the polymer backbone to tune the photo-electronic properties of the copolymers. The obtained copolymers are readily soluble in common organic solvents, such as toluene, THF and chloroform. The number average molecular weights of these polymers were determined by GPC using a polystyrene standard, ranging from 15 400 to 28 300 which are decent results for polymers with a rigid triple bond side chain. These polymers show high decomposition temperature (403–419 °C), narrow band gap (1.27–1.89 eV), and low-lying HOMO energy level (−5.4 to −5.6 eV). The best polymer solar cell (PSC) device based on the copolymer PBDTPA-TPD and PC61BM showed a power conversion efficiency (PCE) of 0.93% with a Voc = 0.96 V, Jsc = 1.9 mA cm−2, and FF = 51%, which is one of the highest Voc values achieved by a benzodithiophene polymer.

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A triple bond side-chained 2D-conjugated benzodithiophene based photovoltaic polymer

Spectral and biodistributional engineering of deep near-infrared chromophore

Fabrication of a novel superhydrophobic cotton by HDTMS with TiO2 supported activated carbon nanocomposites for photocatalysis and oil/water separation

Preparation of superhydrophobic, antibacterial and photocatalytic cotton by the synergistic effect of dual nanoparticles of rGO-TiO2/QAS-SiO2

The invention relates to a donor-receptor type narrow-band semiconductor polymer containing annular alkyl chains The polymer comprises different donor and receptor structural units The polymer aims at utilizing the advantages of high rigidity, good symmetry and preferential conformation of cycloparaffin relative to branched paraffin for regulating and controlling the self-assembly character of the film forming process of the polymer and improving the ordering performance of the polymer in a mixed film The annular alkyl chains can properly twist polymer main chains, even so, the band gap of the polymer is almost not influenced, wide absorption is still achieved, and the polymer is crucially important to improving the open-circuit voltage of the polymer solar cell and reducing energy loss Based on researches, it is found that the annular alkyl chains can comprehensively improve the open-circuit voltage, short-circuit current density and fill factor of the polymer solar cell, finally, the power conversion efficiency of the polymer solar cell is remarkably improved, and the polymer is a semiconductor polymer modified and substituted group with wide prospects

Weichao Chen

Papers

A triple bond side-chained 2D-conjugated benzodithiophene based photovoltaic polymer

Spectral and biodistributional engineering of deep near-infrared chromophore

Fabrication of a novel superhydrophobic cotton by HDTMS with TiO2 supported activated carbon nanocomposites for photocatalysis and oil/water separation

Preparation of superhydrophobic, antibacterial and photocatalytic cotton by the synergistic effect of dual nanoparticles of rGO-TiO2/QAS-SiO2

Application of annular alkyl chain substituted semiconductor polymer in organic solar cell