A5037785060- solar cell performance optimization
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Organic Electronics and Photovoltaics
- Nanowire Synthesis and Applications
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and interfaces
- Quantum Dots Synthesis And Properties
- Silicon and Solar Cell Technologies
- Organic Light-Emitting Diodes Research
- Thermal Radiation and Cooling Technologies
- Food composition and properties
- Advanced Memory and Neural Computing
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Consumer Attitudes and Food Labeling
- Semiconductor materials and devices
- Nutritional Studies and Diet
- Advanced Thermoelectric Materials and Devices
- Advanced Photocatalysis Techniques
- Thermal properties of materials
- Molecular Junctions and Nanostructures
- ZnO doping and properties
University of Houston
2016-2020
Manufacturing Institute
2017-2020
Institute of Advanced Manufacturing Technology
2019
South Dakota State University
2014-2018
Brookings Institution
2015-2016
Tribhuvan University
2011
We report effects of an interface between TiO2–perovskite and grain–grain boundaries perovskite films prepared by single step sequential deposited technique using different annealing times at optimum temperature. Nanoscale kelvin probe force microscopy (KPFM) measurement shows that charge transport in a solar cell critically depends upon the conditions. The KPFM results show increase potential barrier suppresses back-recombination electrons TiO2 holes perovskite. Spatial mapping surface...
Room temperature growth and crystallization of perovskite nanorod films in ambient air without the use thermal annealing was reported for high performance solar cells.
The role of electron selective interfaces on the performance and lifetime polymer solar cells were compared analyzed. Bilayer consisting metal oxide films with cationic modification namely poly ethylenimine ethoxylated (PEIE) found to enhance device bare when used as an cathode interface. Devices utilizing surface-modified layers showed enhanced lifetimes, retaining up 85% their original efficiency stored in ambient atmosphere for 180 days without any encapsulation. work function surface...
Thermal annealing and precursor composition play critical roles in crystallinity control morphology formation of perovskite thin films for achieving higher photovoltaic performance. In this study we have systematically studied the role temperature on (CHNH3PbI3) cast from single (without PbCl2) mixed (with halide precursors. Higher leads to agglomeration crystals. The effects performance solar cells are different processed films. It is observed that film can be altered with addition lead...
Lead free CH3NH3SnI3 perovskite thin film was prepared by low temperature solution processing and characterized using current sensing atomic force microscopy (CS-AFM). Analysis of electrical, optical, optoelectrical properties reveals unique p-type semiconducting nature metal like conductivity this material. also showed a strong absorption in visible near infrared spectrum with onset 1.3 eV. X-ray Diffraction analysis scanning electron (SEM) confirmed structure compound uniform formation....
Single-junction GaAs solar cells were developed on metal foils, laying the foundation for scalable manufacturing of low-cost, lightweight and high-efficiency flexible III–V cells.
Conjugated polymers are potential materials for photovoltaic applications due to their high absorption coefficient, mechanical flexibility, and solution-based processing low-cost solar cells. A bulk heterojunction (BHJ) structure made of donor–acceptor composite can lead charge transfer power conversion efficiency. Active layer morphology is a key factor device performance. Film formation processes (e.g., spray-coating, spin-coating, dip-coating), post-treatment annealing UV ozone...
In this work, we report improved performance by controlling morphology using different fullerene derivatives in PBDT-TBT-alkoBT based organic solar cells.
High mobility n-type GaAs – mobilities greater than 1300 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>, highest achieved among semiconductor films grown directly on Ge template metal foils.
Abstract This study demonstrates the first flexible single‐junction III‐V photovoltaic solar cells (SCs) based on single‐crystal‐like gallium arsenide (GaAs) thin films a low‐cost metal substrate by direct and continuous deposition, which can bypass expensive single crystal wafer fabrication. The two‐dimensional modeling of GaAs SC is developed used to feasibility for high performance devices. A promising device characteristic with an open‐circuit voltage 560 mV short circuit current 19.4...
This data in brief includes forward and reverse scanned current density-voltage (J-V) characteristics of perovskite solar cells with PDPP3T spiro-OMeTAD as HTL, stability testing conditions cell shelf life air for both HTL per the description Ref. [1], individual J-V performance parameters acquired increasing time exposed ambient are shown type devices using HTL. The collected this study compares device based is directly related to our research article "solution processed pristine polymer...
In this work, the effects of spacer between benzo[1,2-b;3,4-b′]dithiophene (BDT) and dialkoxybenzothiadiazole (ROBT) in polymers were investigated for applications organic solar cells. Polymer PBDT–2T–ROBT has a bithiophene (2T) BDT ROBT units, whereas PBDT–ROBT is direct copolymer ROBT. The polymer/PC70BM cells using both fabricated optimized via polymer/fullerene ratio, solvent, solvent additives. significantly improved cell performance from 1.28% (Voc =0.77 V, Jsc = 3.13 mA/cm2, FF...
A simple cost-effective approach was demonstrated to increase the rear efficiency and ratio of rear-to-front efficiencies for bifacial dye-sensitized solar cells (DSCs). This achieved by enhancing transparency counter electrode DSC using a composite platinum- aluminum-doped zinc oxide (Pt/AZO). The thermally deposited Pt/AZO electrodes exhibited transmittance T550 nm = 0.70–0.74 versus Pt with 0.63. comparable front power conversion (PCE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, the role of fullerene loading on nanomorphology and photovoltaic performance alternating copolymer poly{2-octyldodecyloxy-benzo[1,2-b;3,4-b] dithiophene-alt-5,6-bis(dodecyloxy)-4,7bis(thiophen-2-yl)-benzo[c] [1,2,5]-thiadiazole} (PBDT-ABT-1) blend films was investigated. The morphology with different Phenyl C-60-butyric acid methyl ester (PCBM) mixing ratios solvent additives studied using atomic force microscopy (AFM) energy-filtered transmission electron (EFTEM). AFM EFTEM...
Abstract We demonstrate the fabrication and characterization of high‐efficiency, single‐junction p‐i‐n GaAs solar cells, on flexible metal foil with epi‐ready buffer via roll‐to‐roll fabrication. Single‐junction cells were fabricated using metal–organic chemical vapor deposition (MOCVD). An efficiency greater than 13% was obtained at 1 sun, which is highest reported photovoltaics directly deposited tapes. This exceeds our previously study showcasing 11.5% p‐n cell structure. Improved...
In this paper, we demonstrate that low-temperature-processed aluminum-doped zinc oxide (AZO)/ethoxylated polyethylenimine (PEIE) electron transport layer (ETL) significantly improves the performance of poly[(4,4'-bis(2- ethylhexyl) dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,1,3 benzothiadiazole)-4,7-diyl] (PSBTBT)-based inverted organic solar cells. Different metal oxides, including (ZnO), AZO, ZnO/PEIE, and AZO/PEIE, were used as ETL. The optical morphological properties ZnO, PEIE,...
In solution-processed tandem polymer solar cells, one of the most challenging parts is optimization interconnecting layers (ICLs) between subcells. this study, ICLs were optimized for double- and triple-junction cells. We investigated robustness PEDOT:PSS/AZO/PEIE ICL Solvent testing showed a uniform coverage PEDOT:PSS layer when prepared without adding DMSO IPA in with no use additional filters. The performance cells was on different temperatures interfacial layer. annealing temperature can...
In this work role of solvent additive namely 1,8 diiodoctane (DIO) on the nanoscale morphology and its relation with charge transport poly(diketopyrrolopyrrole-terthiophene) (PDPP3T):PCBM solar cells has been investigated. Addition DIO led to enhanced structural ordering as observed from optical measurements. Photovoltaic devices processed showed improved efficiencies due significant enhancement in short circuit current density. Atomic force microscopy (AFM) Kelvin probe (KPFM) images that...
Study of forces between the sample and AFM cantilever tip is basic in force distance study. plays vital role acts as Hooken’s response giving rise to measurement. Force characterization depends on various conditions. That yield theories like JKR , DMT interaction etc. have been using for its explanation.Key words: AFM; Hooken's response; UHV; JKR; DMTThe Himalayan PhysicsVol.2, No.2, May, 2011Page: 80-83Uploaded Date: 1 August, 2011