A5080458782- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Synthetic Organic Chemistry Methods
- Molecular Junctions and Nanostructures
- Chemical Synthesis and Analysis
- Thin-Film Transistor Technologies
- Advanced Memory and Neural Computing
- Crystallography and molecular interactions
- Carbohydrate Chemistry and Synthesis
- Fullerene Chemistry and Applications
- Semiconductor materials and interfaces
- Microbial Natural Products and Biosynthesis
- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Fuel Cells and Related Materials
- Organic and Molecular Conductors Research
Northwestern University
2017-2020
Center for Light Energy Activated Redox Processes
2019-2020
Yale University
2020
University of New Haven
2020
Western Washington University
2014-2015
Indacenodithienothiophene (IDTT)-based postfullerene electron acceptors, such as ITIC (2,2'-[[6,6,12,12-tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3- d:2',3'- d']-s-indaceno[1,2- b:5,6- b']dithiophene-2,8-diyl]-bis[methylidyne(3-oxo-1 H-indene-2,1(3 H)-diylidene)]]bis[propanedinitrile]), have become synonymous with high power conversion efficiencies (PCEs) in bulk heterojunction (BHJ) polymer solar cells (PSCs). Here we systematically investigate the influence of end-group fluorination...
Emerging nonfullerene acceptors (NFAs) with crystalline domains enable high-performance bulk heterojunction (BHJ) solar cells. Thermal annealing is known to enhance the BHJ photoactive layer morphology and performance. However, microscopic mechanism of annealing-induced performance enhancement poorly understood in emerging NFAs, especially regarding competing factors. Here, optimized thermal model system PBDB-TF:Y6 (Y6 =...
Significance For producing electricity, polymer solar cells (PSCs) offer properties tunability, light weight, scalability, and earth-abundant materials. PSC active layers typically consist of donor fullerene acceptor blends having discrete conduits for photogenerated hole electron conduction. The spherical shape, which enables close packing, orbital degeneracies, low charge-transfer reorganization energies, is thought to be essential efficient photocurrent generation high power conversion...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnhancing Indacenodithiophene Acceptor Crystallinity via Substituent Manipulation Increases Organic Solar Cell EfficiencyThomas J. Aldrich†, Steven M. Swick†, Ferdinand S. Melkonyan*†‡, and Tobin Marks*†‡View Author Information† Department of Chemistry the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States‡ Science Engineering Argonne Energy Center (ANSER), States*E-mail: [email...
Abstract The synthesis and characterization of new semiconducting materials is essential for developing high‐efficiency organic solar cells. Here, the synthesis, physiochemical properties, thin film morphology, photovoltaic response ITN‐F4 ITzN‐F4, first indacenodithienothiophene nonfullerene acceptors that combine π‐extension fluorination, are reported. neat bulk‐heterojunction blend films with fluorinated donor polymer poly{[4,8‐bis[5‐(2‐ethylhexyl)‐4‐fluoro‐2‐thienyl]benzo[1,2‐b:4,5‐ b...
Abstract Accurate single‐crystal X‐ray diffraction data offer a unique opportunity to compare and contrast the atomistic details of bulk heterojunction photovoltaic small‐molecule acceptor structure packing, as well provide an essential starting point for computational electronic charge transport analysis. Herein, we report diffraction‐derived crystal structures analyses on n‐type semiconductors which enable some highest efficiency organic solar cells produced date,...
The electron-transporting properties of n-type polymers strongly depend on the chemical and electronic structure electron-deficient building blocks. Here, we design develop a novel unit, thienopyridine-fused naphthalene amide (TPNA), via π-conjugative extension at diagonal position widely investigated diimide (NDI) moiety to address severe π-backbone twisting typical NDI-based polymers. TPNA-based homopolymer (Homo-TPNA), donor–acceptor copolymer (TPNA-T, T = thienyl), all-acceptor...
Achieving efficient polymer solar cells (PSCs) requires a structurally optimal donor–acceptor heterojunction morphology. Here we report the combined experimental and theoretical characterization of benzodithiophene–benzothiadiazole donor series (PBTZF4-R; R = alkyl substituent) blended with non-fullerene acceptor ITIC-Th analyze effects substituent dimensions on blend morphology, charge transport, carrier dynamics, PSC metrics. Varying has pronounced effect morphology direct link between...
(−)-Lomaiviticin A is a cytotoxic, tetraglycosylated, <italic>C</italic><sub>2</sub>-symmetric bacterial metabolite. synthesis of the dimeric core lomaiviticin containing two carbohydrate residues reported
The synthesis of a new ‘eastern domain’ proposed dihydroarchazolid analogue is described along with initial results from attempted macrocyclization by ring-closing metathesis. This work has revealed competing backbiting process that may be preventable alcohol functionalization and installation metathesis relay.