A5100318111- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Membrane-based Ion Separation Techniques
- Fuel Cells and Related Materials
- Quantum Dots Synthesis And Properties
- Semiconductor materials and interfaces
- Organic and Molecular Conductors Research
- Silicon and Solar Cell Technologies
- Advanced Photocatalysis Techniques
- Advanced Sensor and Energy Harvesting Materials
- solar cell performance optimization
- Photochemistry and Electron Transfer Studies
- Advancements in Solid Oxide Fuel Cells
- Advanced Fluorescence Microscopy Techniques
- Luminescence and Fluorescent Materials
- Advanced battery technologies research
- CO2 Reduction Techniques and Catalysts
- Advanced Memory and Neural Computing
- Covalent Organic Framework Applications
- Photochromic and Fluorescence Chemistry
Wuhan University of Technology
2011-2025
Swansea University
2020-2022
Changchun Institute of Optics, Fine Mechanics and Physics
2022
Chinese Academy of Sciences
2022
Tianjin University
2016-2022
Bridge University
2021
Hunan Institute of Science and Technology
2021
Tokyo Institute of Technology
2021
State Key Laboratory of Silicate Materials for Architecture
2018-2020
Wuhan University
2015-2019
Abstract Narrow bandgap conjugated polymers in combination with fullerene acceptors are under intense investigation the field of organic photovoltaics (OPVs). The open circuit voltage, and thereby power conversion efficiency, devices is related to offset frontier orbital energy levels donor acceptor components, 1 , 2 which widely determined by cyclic voltammetry. Inconsistencies have appeared use ferrocenium/ferrocene (Fc + /Fc) redox couple, as well values used for absolute potentials...
Donor-acceptor conjugated polymers PBDT-DTBT and PBDT-DTNT, based on 2,1,3-benzothiadiazole (BT) naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole (NT), have been designed synthesized for polymer solar cells. NT contains two fused 1,2,5-thiadiazole rings that lower the band gap, enhance interchain packing, improve charge mobility of resulting polymer. Consequently, NT-based PBDT-DTNT exhibited considerably better photovoltaic performance with a power conversion efficiency (PCE) 6.00% when compared...
Abstract Organic solar cells are composed of electron donating and accepting organic semiconductors. Whilst a significant palette donors has been developed over three decades, until recently only small number acceptors have proven capable delivering high power conversion efficiencies. In particular the fullerenes dominated landscape. this perspective, emergence family materials–the non‐fullerene (NFAs) is described. These delivered discontinuous advance in cell efficiencies, with milestone...
Organic photovoltaics (OPVs) suffer from a trade-off between efficient charge transport and suppressed nonradiative recombination due to the aggregation-induced luminance quenching of organic semiconductors. To resolve this grand challenge, π-extended nonfullerene acceptor (NFA) B6Cl with large voids among honeycomb network is designed introduced into photovoltaic systems. We find that presence small amount (i.e., 0.5 or 1 wt %) can compress molecular packing host L8-BO, leading shortened...
The structural order and aggregation of non-fullerene acceptors (NFA) are critical toward light absorption, phase separation, charge transport properties their photovoltaic blends with electron donors, determine the power conversion efficiency (PCE) corresponding organic solar cells (OSCs). In this work, fibrillization small molecular NFA L8-BO assistance fused-ring solvent additive 1-fluoronaphthalene (FN) to substantially improve device PCE is demonstrated. Molecular dynamics simulations...
In crystalline semiconductors, absorption onset sharpness is characterized by temperature-dependent Urbach energies. These energies quantify the static, structural disorder causing localized exponential-tail states, and dynamic from electron-phonon scattering. Applicability of this model to disordered solids has been long debated. Nonetheless, exponential fittings are routinely applied sub-gap analysis organic semiconductors. Herein, we elucidate spectral line-shapes semiconductors their...
The nanoscale fibrillar morphology, featuring long-range structural order, provides abundant interfaces for efficient exciton dissociation and high-quality pathways effective charge transport, is a promising morphology high performance organic solar cells. Here, we synthesize thiophene terminated non-fullerene acceptor, L8-ThCl, to induce the fibrillization of both polymer donor host that surpasses 20% efficiency milestone After adding original weak less continuous nanofibrils donors, i.e....
Conjugated polymers are generally featured with low structural order due to their aromatic and irregular units, which limits light absorption charge mobility in organic solar cells. In this work, we report a conjugated molecule INMB-F that can act as molecular bridge via electrostatic force enhance the intermolecular stacking of BDT-based polymer donors toward efficient stable Molecular dynamics simulations synchrotron X-ray measurements reveal electronegative adsorb on electropositive main...
Organic semiconductors are generally featured with low structure order in solid-state films, which leads to charge-transport mobility and strong charge recombination their photovoltaic devices. In this work, a "polycrystal-induced aggregation" strategy orders the polymer donor (PM6) non-fullerene acceptor (L8-BO) molecules during solution casting assistance of PM6 polycrystals that incubated through vapor diffusion method, toward improved solar cell efficiency either thin or thick...
UV-light illumination converts the aromatic conformation of polymer donors into a rigid quinone structure, resulting in compact fibrillar aggregation active layer to achieve maximum efficiency 19.9% single-junction organic solar cells.
Abstract Realizing fibrillar molecular framework is highly encouraged in organic solar cells (OSCs) due to the merit of efficient charge carrier transport. This however mainly achieved via chemical structural design photovoltaic semiconductors. In this work, through utilization three alkoxythiophene additives, T‐2OMe, T‐OEH, and T‐2OEH, intermolecular interactions among a series BDT‐type polymer donors, i.e., PM6, D18, PBDB‐T, PTB7‐Th, are tuned self‐assemble into nanofibrils during solution...
Abstract Organic semiconductors have attracted tremendous attention in the past few years, thanks to their excellent flexibility, solution‐processability, low‐cost, chemical versatility, etc. Particularly, organic solar cells based on ternary heterojunctions shown remarkable device performance, with recent development of nonfullerene acceptor materials. These novel materials are also promising for photodetection. However, there several key limits facing photodetectors, such as relatively...
Abstract Efficient, low‐cost, and low‐embodied energy photovoltaics are key enablers of the global decarbonization agenda. In addition to market‐leading crystalline silicon technology, several other promising candidates under active investigation with perovskites leading way single‐junction efficiencies exceeding 25% at lab‐scale. So‐called organic (solar cells based upon semiconductors), particularly those that can be solution processed, have long promised Nirvana ultralow cost very short...
Abstract Trap-assisted recombination caused by localised sub-gap states is one of the most important first-order loss mechanism limiting power-conversion efficiency all solar cells. The presence and relevance trap-assisted in organic photovoltaic devices still a matter some considerable ambiguity debate, hindering field as it seeks to deliver ever higher efficiencies ultimately viable new technology. In this work, we show that photocurrent universally present under operational conditions...
Abstract Detailed balance is a cornerstone of our understanding artificial light-harvesting systems. For next generation organic solar cells, this involves intermolecular charge-transfer (CT) states whose energies set the maximum open circuit voltage V OC . We have directly observed sub-gap significantly lower in energy than CT external quantum efficiency spectra significant number semiconductor blends. Taking these into account and using principle reciprocity between emission absorption...
The competition between recombination and extraction of carriers defines the charge collection efficiency and, therefore, overall performance organic photovoltaic devices, including solar cells photodetectors. In this work, we describe different components steady-state light intensity-dependent photocurrent (IPC) under operational conditions. Further, demonstrate how loss mechanisms can be identified based on their unique signatures in IPC. particular, show IPC used to distinguish...
Abstract Realizing bicontinuous fibrillar charge transport networks in the photoactive layer has been considered a promising method to achieve high‐efficiency organic solar cells (OSCs); however, this rarely achieved due interference of molecular organization donor and acceptor components during solution casting. In contribution, fibrillization polymer PM6 small nonfullerene L8‐BO is realized with assistance conjugated D18‐Cl. Atomic force microscopy photo‐induced reveal that D18‐Cl...
Abstract Developing a fundamental understanding of the molecular order within photoactive layer, and influence therein solution casting conditions, is key factor in obtaining high power conversation efficiency (PCE) polymer solar cells. Herein, PBDB‐T:INPIC‐4F nonfullerene cells tuned by control organization time during film casting, crucial role retarding crystallization INPIC‐4F achieving performance demonstrated. When cast with presence solvent vapor to prolong time, molecules form...
Fluorination of conjugated molecules has been established as an effective structural modification strategy to influence properties and attracted extensive attention in organic solar cells (OSCs). Here, we have investigated optoelectronic photovoltaic property changes OSCs made polymer donors with the non-fullerene acceptors (NFAs) ITIC IEICO their fluorinated counterparts IT-4F IEICO-4F. Device studies show that NFAs lead reduced Voc but increased Jsc fill-factor (FF), therefore, ultimate...