Yingzhi Jin
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Lead-free tin perovskite solar cells
Efficient hole transport layers based on cross-linked poly(N-vinylcarbazole) for high-performance perovskite photodetectors
DOI: 10.1039/D1TC01367J, Paper
The cross-linked PVK doping with F4TCNQ demonstrated outstanding hole extraction and transport capability, has been successfully used in p–i–n perovskite photodetectors as an efficient hole transport layer (HTL).
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Tetra-indole core as a dual agent: a hole selective layer that passivates defects in perovskite solar cells
DOI: 10.1039/D1TC01258D, Paper
An organic small molecule composed of a tetra-indole core was introduced as a hole selective layer that can also act a passivating agent to supress the surface defects in perovskite solar cells (PSCs).
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Improving the performance of organic solar cells by side chain engineering of fused ring electron acceptors
DOI: 10.1039/D1TC00579K, Paper
The side chain engineering of photoactive materials is one of the most commonly used molecular design strategies for developing high performance organic solar cells (OSCs).
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Planar heterojunctions for reduced non-radiative open-circuit voltage loss and enhanced stability of organic solar cells
DOI: 10.1039/D1TC01536B, Paper
Planar heterojunction organic solar cells exhibit lower trap density, higher electroluminescence efficiency, smaller non-radiative open-circuit voltage loss and better stability than bulk heterojunction counterparts.
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[ASAP] An Inkjet-Printed PEDOT:PSS-Based Stretchable Conductor for Wearable Health Monitoring Device Applications

[ASAP] Surface Modification of PEDOT:PSS for Enhanced Performance of Inverted Perovskite Solar Cells

[ASAP] Smart Strategy: Transparent Hole-Transporting Polymer as a Regulator to Optimize Photomultiplication-type Polymer Photodetectors

[ASAP] Fabrication of High VOC Organic Solar Cells with a Non-Halogenated Solvent and the Effect of Substituted Groups for “Same-A-Strategy” Material Combinations

A Quinoxaline‐Based D–A Copolymer Donor Achieving 17.62% Efficiency of Organic Solar Cells
Two D–A copolymers, PBQ5 and PBQ6, are designed and synthesized based on difluoroquinoxaline (DFQ) units with different side chains. The organic solar cell (OSC) based on PBQ6 as donor and Y6 as acceptor achieves a high power conversion efficiency of 17.62%, which is one of the highest efficiencies for binary OSCs with a polymer donor and Y6 acceptor.
Abstract
Side-chain engineering has been an effective strategy in tuning electronic energy levels, intermolecular interaction, and aggregation morphology of organic photovoltaic materials, which is very important for improving the power conversion efficiency (PCE) of organic solar cells (OSCs). In this work, two D–A copolymers, PBQ5 and PBQ6, are designed and synthesized based on bithienyl-benzodithiophene (BDTT) as the donor (D) unit, difluoroquinoxaline (DFQ) with different side chains as the acceptor (A) unit, and thiophene as the π-bridges. PBQ6 with two alkyl-substituted fluorothiophene side chains on the DFQ units possesses redshifted absorption, stronger intermolecular interaction, and higher hole mobility than PBQ5 with two alkyl side chains on the DFQ units. The blend film of the PBQ6 donor with the Y6 acceptor shows higher and balanced hole/electron mobilities, less charge carrier recombination, and more favorable aggregation morphology. Therefore, the OSC based on PBQ6:Y6 achieves a PCE as high as 17.62% with a high fill factor of 77.91%, which is significantly higher than the PCE (15.55%) of the PBQ5:Y6-based OSC. The PCE of 17.62% is by far one of the highest efficiencies for the binary OSCs with polymer donor and Y6 acceptor.
One-micron-thick organic indoor light harvesters with low photocurrent loss and fill factors over 67%
DOI: 10.1039/D1TA02345D, Paper
A diluting strategy with insulating polystyrene is adopted in indoor light harvesters, and achieves high-performance 1-micron-thick photovoltaic device with low trap state density and a record fill factor over 67% under light-emitting diode lights.
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Effective stability enhancement in ZnO-based perovskite solar cells by MACl modification
DOI: 10.1039/D1TA02697F, Paper
To overcome the shortcomings of ZnO in PSCs comprising organic cations-based perovskite, MACl is used to eliminate the deprotonization ability of ZnO, which thereby enhances the stability and improves the device efficiency, simultaneously.
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[ASAP] Facile Approach to Conductive Polymer Microelectrodes for Flexible Electronics

Optimization of active layer morphology by small-molecule donor design enables over 15% efficiency in small-molecule organic solar cells
DOI: 10.1039/D0TA12242D, Paper
Two conjugated small molecules with different conjugated side chains were synthesized to study their photovoltaic performances.
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BODIPY-Modified Terpolymer Donors for Efficient Fullerene- and Nonfullerene-Polymer Solar Cells
DOI: 10.1039/D1TC01290H, Paper
Developing efficient polymer donor materials to well-match with acceptors affords continuous contributions to the eminent progress of polymer solar cells (PSCs). Herein, a new series of terpolymer donors is developed...
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[ASAP] Self-Adhesive, Stretchable, Biocompatible, and Conductive Nonvolatile Eutectogels as Wearable Conformal Strain and Pressure Sensors and Biopotential Electrodes for Precise Health Monitoring

[ASAP] Low-Cost Hole-Transporting Materials Based on Carbohelicene for High-Performance Perovskite Solar Cells

[ASAP] Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells

A New Conjugated Polymer that Enables the Integration of Photovoltaic and Light‐Emitting Functions in One Device
A new wide-bandgap conjugated polymer, PBQx-TCl, exhibits 18% efficiency for outdoor application and 28.5% efficiency for indoor application. Simultaneously, the PBQx-TCl-based device also shows light-emitting function with broad emission ranges from 630 to 1000 nm and moderate external quantum efficiency approaching 0.2%.
Abstract
Exploring the intriguing bifunctional nature of organic semiconductors and investigating the feasibility of fabricating bifunctional devices are of great significance in realizing various applications with one device. Here, the design of a new wide-bandgap polymer named PBQx-TCl (optical bandgap of 2.05 eV) is reported, and its applications in photovoltaic and light-emitting devices are studied. By fabricating devices with nonfullerene acceptors BTA3 and BTP-eC9, it is shown that the devices exhibit a high power conversion efficiency (PCE) of 18.0% under air mass 1.5G illumination conditions and an outstanding PCE of 28.5% for a 1 cm2 device and 26.0% for a 10 cm2 device under illumination from a 1000 lux light-emitting diode. In addition, the PBQx-TCl:BTA3-based device also demonstrates a moderate organic light-emitting diode performance with an electroluminescence external quantum efficiency approaching 0.2% and a broad emission range of 630–1000 nm. These results suggest that the polymer PBQx-TCl-based devices exhibit outstanding photovoltaic performance and potential light-emitting functions.
Machine learning-assisted development of organic photovoltaics via high-throughput in-situ formulation
DOI: 10.1039/D1EE00641J, Paper
Discovery of high-performance non-fullerene acceptors and ternary blend systems have resulted in a breakthrough in the efficiency of organic photovoltaics (OPVs) and created new opportunities for commercialization. However, manufacturing technology...
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Highly sensitive, broad-band organic photomultiplication-type photodetectors covering UV-Vis-NIR
DOI: 10.1039/D1TC00555C, Paper
UV-Vis-NIR broad-band organic photomultiplication-type photodetectors (OPMPDs) were fabricated with device structure of indium tin oxide (ITO)/ zinc oxide (ZnO)/(~150 nm) active layers/Au. The active layers are consisted with 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3-undecyl-9-(undecyloxy)-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[3,2-b]indole-2,10-diyl)bis(methaneylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H,1-diylidene))dimalononitrile (Y6-1O):5-(5-(4,8-bis(4-chloro-5-(2-ethylhexyl)thiophen-2-yl)-6-methylbenzo[1,2-b:4,5-b']dithiophen-2-yl)-4-(2-butyloctyl)-2-yl)-8-(4-(2-butyloctyl)-5-thiophen-2-yl)dithieno[3',2':3,4;2'',3'':5,6]benzo[1,2-c][1,2,5]thiadiazole...
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Rational compatibility in ternary matrix enables all-small-molecule organic solar cells with over 16% efficiency
DOI: 10.1039/D1EE00496D, Paper
How to manipulate the phase separation and molecular arrangement to meet the need of efficient charge generation and extraction remains as the long-standing challenge in all-small-molecule organic solar cells (ASM-OSCs)....
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[ASAP] High-Efficiency and Stable Organic Solar Cells with Stacked LiF and Organic Electrolytes as Cathode Interface Layers

[ASAP] Mechanically Robust and Flexible Perovskite Solar Cells via a Printable and Gelatinous Interface

Naphthalenothiophene imide-based polymer exhibiting over 17% efficiency
16% efficiency all-polymer organic solar cells enabled by a finely tuned morphology via the design of ternary blend
High-performance and eco-friendly semitransparent organic solar cells for greenhouse applications
[ASAP] Deciphering Electron Interplay at the Fullerene/Sputtered TiOx Interface: A Barrier-Free Electron Extraction for Organic Solar Cells

Tremendously Enhanced Photocurrent Enabled by Triplet-Triplet Annihilation Up-Conversion for High-Performance Perovskite Solar Cells
DOI: 10.1039/D1EE00631B, Paper
The limited solar spectra utilization hinders the further amelioration of perovskite solar cells (PVSCs) performance. Up-conversion (UC) process extends the spectral absorption of PVSCs from visible to near-infrared (NIR) range...
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[ASAP] Brominated Small-Molecule Acceptors with a Simple Non-fused Framework for Efficient Organic Solar Cells
