A5070179771- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- solar cell performance optimization
- Quantum Dots Synthesis And Properties
Shenzhen Technology University
2022-2025
Hong Kong University of Science and Technology
2023-2025
University of Hong Kong
2023-2025
Abstract Currently, nearly all high‐efficiency organic photovoltaic devices use donor polymers based on the benzo‐dithiophene (BDT) unit. To diversify choices of building blocks for high‐performance polymers, benzo‐difuran (BDF) units is explored, which can achieve reduced steric hindrance, stronger molecular packing, and tunable energy levels. In previous research, performance BDF‐based lagged behind those BDT‐based devices. this study, a high efficiency (18.4%) achieved using polymer...
Abstract In this study, a novel wide‐bandgap small molecule guest material, ITOA, designed and synthesized for fabricating efficient ternary organic solar cells (OSCs) ITOA complements the absorbance of PM6:Y6 binary system, exhibiting strong crystallinity modest miscibility. optimizes morphology by promoting intensive molecular packing, reducing domain size, establishing preferred vertical phase distribution. These features contribute to improved well‐balanced charge transport, suppressed...
All-polymer solar cells with low voltage loss for efficient outdoor and indoor photovoltaics.
Abstract Cyanation is a common chemical modification strategy to fine‐tune the energy levels and molecular packing of organic semiconductors, especially materials used in solar cells (OSCs). Generally, cyanation modify end groups high‐performance small‐molecule acceptors (SMAs). However, has not been investigated on central backbone SMAs, which could introduce stronger intermolecular interaction enhance π–π stacking for rapid charge transport. This paper, first time, reports new...
Abstract Indoor photovoltaics (IPVs) are garnering increasing attention from both the academic and industrial communities due to pressing demand of ecosystem Internet‐of‐Things. All‐polymer solar cells (all‐PSCs), emerging as a sub‐type organic photovoltaics, with merits great film‐forming properties, remarkable morphological light stability, hold promise simultaneously achieve high efficiency long‐term operation in IPV's application. However, dearth polymer acceptors medium‐bandgap has...
Abstract All‐polymer solar cells (all‐PSCs) have promising potential for industrial production due to their superior stability. Recently, the widespread application of polymerized small molecule acceptor (PSMA) has led a surge in efficiency all‐PSCs. However, high efficiencies these devices generally rely on use highly volatile solvent, chloroform (CF). Furthermore, molecular weights PSMA are lower than polymer donors, yet crystallinity is weaker typical molecules, making most PSMA‐based...
Abstract Polymerized small molecule acceptors have recently greatly facilitated the development of all‐polymer solar cells (All‐PSCs) with respect to power conversion efficiencies (PCEs). However, high‐performance and low‐cost polymer donors for All‐PSCs are still lacking, limiting further large‐scale manufacturing All‐PSCs. Herein, this work designs synthesizes a new thiophene derivative, FETVT, featuring vinyl‐bridged fluorine ester‐substituted monothiophene. Incorporation FETVT into...
Abstract The emerging non‐fullerene acceptors with low voltage losses have pushed the power conversion efficiency of organic solar cells (OSCs) to ≈20% auxiliary morphology optimization. Thermal annealing (TA), as most widely adopted post‐treatment method, has been playing an essential role in realizing potential various material systems. However, procedure TA, i.e., way that TA is performed, almost identical among thousands OSC papers since ≈30 years ago other than changes temperature and...
Sequential processing (SqP) of the active layer offers independent optimization donor and acceptor with more targeted solvent design, which is considered most promising strategy for achieving efficient organic solar cells (OSCs). In SqP method, favorable interpenetrating network seriously depends on fine control bottom swelling. However, choice solvent(s) both have been mostly based a trial-and-error manner. A single often cannot achieve sufficient yet not excessive swelling, has long...
Abstract Organic solar cells (OSCs) are regarded as one of the most promising flexible power sources due to their lightweight and properties, with improvement photovoltaic mechanical performance. To improve current density conversion efficiency (PCE), mPh4F‐TS (TS) PYSe2F‐T (PA) introduced into binary host, PM6/mPh4F‐TT (PM6/TT) third components. It is demonstrated that corresponding ternary devices, in both rigid achieved superior efficiencies (19.6%/17.7% for PM6/TT+TS, 19.2%/17.4%...
ABSTRACT In organic solar cells (OSCs), typical methods for fabricating the ternary active layer are blend‐casting (BC) or two‐step sequential processing (SqP‐2T), where all three at least two components blended together, which affect crystallization/aggregation behavior of each other during solid‐film formation. Herein, we introduce first time a novel three‐step method, termed SqP‐3T, utilizes hydrocarbon solvents to prepare high‐quality layers. Compared SqP‐2T and BC techniques, SqP‐3T...
The emergence of polymerized small molecule acceptors (PSMAs) has significantly improved the performance all‐polymer solar cells (all‐PSCs). However, pace device engineering lacks behind that materials development, so a majority PSMAs have not fulfilled their potentials. Furthermore, most high‐performance all‐PSCs rely on use chloroform as processing solvent. For instance, recent PSMA, named PJ1‐ γ , with high LUMO, and HOMO levels, could only achieve PCE 16.1% high‐energy‐level donor (JD40)...
The electron transport layer (ETL) with excellent charge extraction and ability is one of the key components high-performance perovskite solar cells (PSCs). SnO2 has been considered as a more promising ETL for future commercialization PSCs due to its photoelectric properties easy processing. Herein, we propose facile effective modification strategy based on incorporation methylenediammonium dichloride (MDACl2) into precursor colloidal solution. effects MDACl2 transport, defect passivation,...
Adding a small‐molecule donor (SMD) to state‐of‐the‐art nonfullerene organic solar cells (OSCs) is demonstrated as useful strategy construct ternary cells, SMDs typically have high crystallinity and can tune charge transport properties of OSCs. However, the absorption most overlaps with typical polymers (e.g., PM6), which against general guidelines adopting materials complementary in Herein, state‐of‐art (BTR‐Cl) by linking beta position outer thiophene alpha inner unit intentionally...
Sequential processing based devices show improved power conversion efficiency and stability compared to their blend casting counterparts. Systematic characterization reveals the underlying mechanism.
In this work, we apply the sequential processing (SqP) method to address relatively low electron mobility in recent all-polymer solar cells (all-PSCs) based on polymerized small-molecule acceptor (PSMA). Compared blend-casting (BC) method, all-PSCs composed of PM6/PY-IT via SqP show boosted and a more balanced charge carrier transport, which increases FF device compensates for short-circuit current loss, rendering comparable overall performance with BC device. Through film-depth-dependent...
All-polymer solar cells (all-PSCs) are organic in which both the electron donor and acceptor polymers considered more promising large-scale production. Thanks to polymerizing small molecule strategy, power conversion efficiency of all-PSCs has ushered a leap recent years. However, due electrical properties polymerized small-molecule acceptors (PSMAs), FF devices is generally not high. The typical transport material widely used these PNDIT-F3N, it common strategy improve device fill factor...
The emergence of polymerized small molecule acceptors (PSMAs) has significantly improved the performance all-polymer solar cells (all-PSCs). However, pace device engineering lacks behind that materials development, so a majority PSMAs have not fulfilled their potentials. Furthermore, most high-performance all-PSCs rely on use chloroform as processing solvent. For instance, recent PSMA named PJ1-γ, with high LUMO and HOMO levels, could only achieve PCE 16.1% high-energy-level donor (JD40)...
Organic solar cells (OSCs) have attracted lots of attention owing to their low cost, lightweight, and flexibility properties. Nowadays, the performance OSCs is continuously improving with development active layer materials. However, traditional hole transport (HTL) material Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) presents insufficient conductivity rapid degradation, which decreases efficiency stability OSCs. To conquer challenge, two-dimensional (2D) graphitic...
All-polymer solar cells (All-PSCs), whose electron donor and acceptors are both polymeric materials, have attracted great research attention in the past few years. However, most all-PSC devices with top-of-the-line efficiencies processed from chloroform. In this work, we apply sequential processing (SqP) method to fabricate All-PSCs an aromatic hydrocarbon solvent, toluene, obtain up 17.0%. By conducting a series of characterizations on our films devices, demonstrate that preparation SqP...
Palladium diselenide as a thus‐far rarely studied group‐10 transition metal dichalcogenide, has exhibited great potential in the field of optoelectronics due to their superior conductivity, high carrier mobility, and excellent stability. However, few works are reported on application low‐dimensional PdSe 2 organic solar cells (OSCs). Herein, quantum dots (QDs) introduced into high‐efficient nonfullerene OSCs for first time by incorporating solution‐processable QDs hole transport layer (HTL)...
Organic solar cells (OSCs) have gained increasing attention. Among the various directions in OSCs, all-polymer (all-PSCs) emerged as a highly promising and currently active research area due to their excellent film formation properties, mechanical thermal stabilities. However, most of high-efficiency all-PSCs are processed from chloroform with an layer thickness ~100 nm. In order meet requirements for industrialization, thicker low-vapor pressure solvents (preferentially hydrocarbon solvent)...
Multicomponent organic solar cells (OSCs), such as the ternary and quaternary OSCs, not only inherit simplicity of binary OSCs but further promote light harvesting power conversion efficiency (PCE). Here, we propose a new type multicomponent with non-fullerene acceptor isomers. Specifically, fabricate polymer donor J71 mixture isomers, ITCF, acceptors. In comparison, OSC devices two structurally similar (not isomeric) NFAs (IT-DM IT-4F) are made control. The morphology experiments reveal...