A5033064218- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Force Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Silicon and Solar Cell Technologies
- Molecular Junctions and Nanostructures
- Textile materials and evaluations
- Carbon Nanotubes in Composites
- Dyeing and Modifying Textile Fibers
- Advanced Polymer Synthesis and Characterization
- Chalcogenide Semiconductor Thin Films
- Ga2O3 and related materials
- Solid-state spectroscopy and crystallography
Indian Institute of Technology Bombay
2020-2024
IITB-Monash Research Academy
2020-2024
Monash University
2018-2024
University of Washington
2024
A [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) self-assembled monolayer (SAM) has been employed in perovskite devices demonstrating high efficiencies. However, a uniform layer does not form due to the hydrophobicity of Me-4PACz. Here, we tackle this challenge by adding conjugated polyelectrolyte, poly(9,9-bis(3′-(N,N-dimethyl)-N-ethylammonium-propyl-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)) dibromide (PFN-Br), Me-4PACz specific ratio, defined as Pz:PFN. With mixing...
Indoor organic photovoltaics (OPVs) have shown great potential application in driving low-energy-consumption electronics for the Internet of Things. There is still room further improving power conversion efficiency (PCE) indoor OPVs, considering that desired morphology active layer to reduce trap-assisted recombination and voltage losses thus simultaneously enhance fill factor (FF) open-circuit efficient OPVs remains obscure. Herein, by optimizing bulk interface via a layer-by-layer (LBL)...
Abstract Solution‐processed lead sulfide quantum dots (PbS QDs) are an excellent candidate for photodetector applications because they exhibit broadband absorption, a wide range of tuneable bandgaps, high stability in air, and mechanical flexibility. However, crucial criterion the fabrication high‐performance photodetectors is selection ligands, which can facilitate charge carrier transport between PbS QDs passivate surface defects. In this work, authors have studied effect traps on...
Dark current is considered as one of the important parameters to suppress temporal noise and enhance sensitivity photodetectors. This study shows effect active layer thickness different interfacial layers in suppression leakage current. High-sensitivity (D* > 1012 Jones) perovskite photodetectors (PPDs) are fabricated using device structure ITO/PEDOT: PSS/FA0.95Cs0.05PbI3 (dPVSK)/ electron transport (ETL)/BCP/Ag with <1 pA Hz−½. These PPDs have a broadband response from...
By varying the concentration of a solvent additive, we demonstrate modulation intermolecular (donor/acceptor (D/A) interface) and intramolecular (bulk) disorder in blends low-band gap polymer poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopental[2,1-b;3,4-b′]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). Using additive 1,8-diiodooctane (DIO) host-processing solvent, bulk at interface is studied terms Urbach energy,...
Abstract The efficiency of an organic solar cell is highly dependent on the complex, interpenetrating morphology, and molecular order within composite phases bulk heterojunction (BHJ) blend. Both these microstructural aspects are strongly influenced by processing conditions chemical design donor/acceptor materials. To establish improved structure‐function relationships, it vital to visualize local provide specific information about interfaces crystalline texture in BHJ blend films....
Abstract Coating electrodes with self‐assembled monolayer (SAM) of polar molecules is known to reduce contact resistance ( R C ) in organic field effect transistors (OFETs). It shown that the behavior SAM OFETs can be explained by considering a mechanism interfacial doping semiconductor due charge transfer during interface formation. The enhancement analyzed performance pentacene Cu electrodes, coating pentafluorobenzenethiol or perfluorodecanethiol. found application either leads an...
We use electroabsorption (EA) spectroscopy to probe the charge transfer (CT) character in neat films and blends of donors acceptors interest for organic electronic applications. In particular, we compare CT two polymer donor non-fullerene acceptor blends, including 3,9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (IT-4F)...
The nanomorphology of bulk heterojunction (BHJ) blends based on poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) is systematically varied by using the volume fraction solvent additive 1,8-diiodooctane (DIO) from 0 to 20 vol % in chlorobenzene prepare organic solar cells (OSCs). Blends prepared without DIO forms large phase-separated...
The exciton physics of organic semiconductors is exotic. It a domain in which singlet and triplet kinetics both play an important role determining the performance various optoelectronic devices. Since excitons are non-emissive, it brings further challenges understanding kinetics. In this work, we have studied effect polymer chain packing on diffusion polyfluorene based polymeric system, known to give efficient light emitting diode (OLED) efficiency for display Furthermore, system exhibits...
A range of advanced imaging techniques are employed to study the micron- and nano-scale morphology a polymer/non-fullerene acceptor blend. Cryo-electron microscopy in particular reveals nanoscale variations molecular orientation order.
[4-(3,6-dimethyl-9H-carbazole-9-yl)butyl]phosphonic acid (Me-4PACz) self-assembled monolayer (SAM) has been employed in perovskite single junction and tandem devices demonstrating high efficiencies. However, a uniform layer does not form due to the hydrophobicity of Me-4PACz. Here, we tackle this challenge by adding conjugated polyelectrolyte poly(9,9-bis(3'-(N,N-dimethyl)-N-ethylammonium-propyl-2,7-fluorene)-alt-2,7-(9,9dioctylfluorene)dibromide (PFN-Br) Me-4PACz specific ratio, defines as...
The use of photovoltaics (PV) as a renewable energy source has been increasing over the last decade. Photovoltaic devices fabricated on soda-lime glass are rigid, bulky, and have low power-to-weight ratio. Devices flexible substrates high specific power enable throughput roll-to-roll manufacturability. PET, PFN, steel used in solar applications. Willow® Glass from Corning® explored PV replacement. Glass, being stable up to 700 °C, also enables high-temperature processing. In current work, is...