Search results for: Leeyih Wang

Items from 1 to 20 out of 43 results

article

Benzimidazole Based Hole‐Transporting Materials for High‐performance Inverted Perovskite Solar Cells

Yogesh S. Tingare, Chaochin Su, Ja‐Hon Lin, Yi‐Chun Hsieh, more

Advanced Functional Materials > 32 > 33 > n/a - n/a

Interfaces play a decisive role in perovskite solar cells’ power conversion efficiency and their long‐term durability. Small‐molecule hole‐transporting materials (HTMs) have grabbed enormous attention due to their structural flexibility, material properties, and stabilities, allowing for improved operational durability in perovskite photovoltaics. This study synthesizes and investigates a new class...

article

Improving Thermal and Photostability of Polymer Solar Cells by Robust Interface Engineering

Li‐Yun Su, Hsin‐Hsiang Huang, Chang‐En Tsai, Cheng‐Hung Hou, more

Small > 18 > 23 > n/a - n/a

As the power conversion efficiency (PCE) of organic photovoltaics (OPVs) approaches 19%, increasing research attention is being paid to enhancing the device's long‐term stability. In this study, a robust interface engineering of graphene oxide nanosheets (GNS) is expounded on improving the thermal and photostability of non‐fullerene bulk‐heterojunction (NFA BHJ) OPVs to a practical level. Three distinct...

article

Quasi‐2D Perovskite Crystalline Layers for Printable Direct Conversion X‐Ray Imaging

Hsinhan Tsai, Shreetu Shrestha, Lei Pan, Hsin‐Hsiang Huang, more

Advanced Materials > 34 > 13 > n/a - n/a

Polycrystalline perovskite film‐based X‐ray detector is an appealing technology for assembling large scale imager by printing methods. However, thick crystalline layer without trap and solvent residual is challenging to fabricate. Here, the authors report a solution method to produce high quality quasi‐2D perovskite crystalline layers and detectors that are suitable for X‐ray imaging. By introducing...

article

Enhancing Long‐Term Thermal Stability of Non‐Fullerene Organic Solar Cells Using Self‐Assembly Amphiphilic Dendritic Block Copolymer Interlayers

Li‐Yun Su, Hsin‐Hsiang Huang, Yan‐Cheng Lin, Guan‐Lin Chen, more

Advanced Functional Materials > 31 > 4 > n/a - n/a

Herein, interfacial engineering is demonstrated to improve the thermal stability of non‐fullerene bulk‐heterojunction (BHJ) OPVs to a practical level. An amphiphilic dendritic block copolymer (DBC) is developed through a facile coupling method and employed as the surface modifier of ZnO electron‐transporting layer in inverted OPVs. Besides showing distinct self‐assembly behavior, the synthesized DBC...

article

[60]Fullerene‐quinoxaline, benzothiadiazole and benzoselenadiazole based dyads for thermally stable polymer solar cells: anchoring of substituent on fullerene with a poly(3‐hexylthiophene) polymer chain

Kumaravel Elavarasan, Chinnusamy Saravanan, Nagarajan Panneer Selvam, Yen‐Ju Hsieh, more

Polymer International > 67 > 11 > 1555 - 1562

[6,6]‐Phenyl‐C₆₁‐butyric acid methyl ester (PC₆₁BM and PC₇₁BM) is an archetypal electron acceptor in organic photovoltaic devices. However, it nucleates and grows to form aggregates or crystallites on a length scale of tens of nanometres to micrometres under thermal aging, which often results in a significant decrease in device efficiency and stability. To overcome this thermally induced performance...

article

Increase of current density and luminance in organic light-emitting diode with reverse bias driving

Jiun-Haw Lee, Bo-Yen Lin, Yen-Chen Shih, King-Fu Lin, more

Organic Electronics > 2017 > 48 > C > 330-335

When applying the voltage pulses (6 V) to the organic light-emitting diode based on tris(8-hydroxyquinolinato) aluminium (Alq₃) as the electron transporting layer, current density and luminance increased by 16% and 20%, respectively, by providing the reverse bias (−16 V) during the off-period. By using displacement current measurement, we can deduce that such an enhancement resulted from the interfacial...

article

Amino‐Acid‐Induced Preferential Orientation of Perovskite Crystals for Enhancing Interfacial Charge Transfer and Photovoltaic Performance

Yen‐Chen Shih, Yu‐Bing Lan, Chia‐Shuo Li, Hsiao‐Chi Hsieh, more

Small > 13 > 22 > n/a - n/a

Interfacial engineering of perovskite solar cells (PSCs) is attracting intensive attention owing to the charge transfer efficiency at an interface, which greatly influences the photovoltaic performance. This study demonstrates the modification of a TiO₂ electron‐transporting layer with various amino acids, which affects charge transfer efficiency at the TiO₂/CH₃NH₃PbI₃ interface in PSC, among which...

article

New donor–acceptor copolymers with ultra-narrow band gap for photovoltaic application

M. L. Keshtov, D. Yu. Godovskii, S. A. Kuklin, Leeyih Wang, more

Doklady Chemistry > 2016 > 470 > 2 > 283-288

Two novel donor–acceptor (D–A) copolymers P1 and P2 with the thiazoloquinoxaline repeating acceptor moiety and different donor moieties of benzo[1,2-b:4,5-b']dithiophene and isomeric benzo[2,1-b:3,4-b']dithiophene have been prepared. The polymers show light absorption at 300–1200 nm and a band gap width of 0.98 and 1.14 eV, respectively. The energies of the HOMO (–5.42 and–5.29 eV) and LUMO (–3.90...

article

Self-organization and phase transformation of all π-conjugated diblock copolymers and its applications in organic solar cells

Ching Shen, Yi-Huan Lee, Yu-Ping Lee, Chi-Ju Chiang, more

Reactive and Functional Polymers > 2016 > 108 > C > 94-102

In this study, we report on the synthesis and self-assembling behavior of a series of monodisperse all π-conjugated poly(2,5-dihexyloxyp-phenylene)-block-(3-hexylthiophene) (PPP-P3HT) block copolymer system and construct its phase diagram that exhibits diverse nanostructures of predominant PPP nanofibers, PPP-P3HT lamellae, broken lamellae and predominant P3HT nanofibers as a function of the copolymer...

chapter

Polymer nanocomposite for improving light harvesting of perovskite solar cells

Fang-Chi Hsu, Jhong-Yao Wang, Jeng-Yeh Huang, Leeyih Wang, more

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 1638 - 1641

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

We have successfully demonstrated the use of polymer-Au-nanoparticle (Au-NP) nanocomposites as hole transport layer (HTL) materials for improving the performance of perovskite solar cells. In addition to the enhanced electrical properties of the HTL material itself, the embedded Au-NPs can also serve as light scattering centers to extend the optical pathway of the incident light, resulting in enhanced...

article

A new strategy for fabricating organic photovoltaic devices with stable D/A double-channel network to enhance performance using self-assembling all-conjugated diblock copolymer

Yi-Huan Lee, Wei-Chih Chen, Chi-Ju Chiang, Kuo-Chang Kau, more

Nano Energy > 2015 > 13 > C > 103-116

In this study, we demonstrate the cooperative self-assembly of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) and an all-conjugated poly(2,5-dihexyloxy-p-phenylene)-b-poly(3-hexylthiophene) (PPP-P3HT) block copolymer to yield organic photovoltaic devices with enhanced solar cell performance and long-term stability. By a combination of TEM, GISAXS and GIWAXS structural investigations, it was found...

article

Novel fulleropyrrolidines bearing π-conjugated thiophene derivatives as compatibilizing group for developing highly stable polymer solar cells

Rathinam Raja, Wei-Shin Liu, Chuen-Yo Hsiow, Yen-Ju Hsieh, more

Organic Electronics > 2014 > 15 > 10 > 2223-2233

A series of new fulleropyrrolidines, which comprise one terthiophene (3T) or dithienyl thienothiophene (2TTT) conjugated segment along with two hexyl (H) or ethylhexyl (EH) chains, abbreviated as 3T-H-C ₆₀ , 3T-EH-C ₆₀ , 2TTT-H-C ₆₀ and 2TTT-EH-C ₆₀ , were designed and synthesized to improve their structural compatibility with poly(3-hexylthiophene) (P3HT). These [60]fullerene...

article

Effect of structural compatibility of dye and hole transport material on performance of solid-state dye-sensitized solar cells

Wei-Chih Chen, Chia-Yuan Chen, Chun-Guey Wu, Kuo-Chuan Ho, more

Journal of Power Sources > 2012 > 214 > Complete > 113-118

Solid-state dye-sensitized solar cells (ss-DSCs) are fabricated using Z907 or its thiophene derivative, CYC-B11, as a dye, and poly(3-hexylthiophene) (P3HT) or (2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine)9,9′)-spirobifluorene (OMeTAD) as a hole transport material (HTM). The effect of the structural compatibility of dye molecules with HTM on device performance is investigated. The CYC-B11/P3HT...

article

Controlled Self-Aggregation of C ₆₀ -Anchored Multiarmed Polyacrylic Acids and Their Cytotoxicity Evaluation

Chih-Chien Chu, Ya-Ju Tsai, Li-Chia Hsiao, Leeyih Wang

Macromolecules > 2011 > 44 > 17 > 7056 - 7061

article

Triphenylamine-substituted methanofullerene derivatives for enhanced open-circuit voltages and efficiencies in polymer solar cells

Chiou-Ling Chang, Chin-Wei Liang, Jyun-Jie Syu, Leeyih Wang, more

Solar Energy Materials and Solar Cells > 2011 > 95 > 8 > 2371-2379

A new class of triphenylamine substituted methanofullerene derivatives, bis(4'-(diphenylamino)biphenyl-4-yl)methanofullerene (1) and the bisadduct (2), were synthesized. The incident photon to current efficiency (IPCE) studies revealed that the diphenylamino components have contribution to the photocurrent that expands the light harvesting window around 400nm. When being blended with poly (3-hexylthiophene)...

article

A novel biosensing mechanism based on a poly(N-butyl benzimidazole)-modified gold electrode for the detection of hydrogen peroxide

Mu-Yi Hua, Hsiao-Chien Chen, Rung-Ywan Tsai, Yu-Chen Lin, more

Analytica Chimica Acta > 2011 > 693 > 1-2 > 114-120

A novel mechanism to detect hydrogen peroxide (H ₂ O ₂ ) using a poly(N-butyl benzimidazole) (PBBI)-modified gold (PBBI/Au) electrode is proposed. Synthetic PBBI was oxidized using a mixture of acetic acid (AcOH) and H ₂ O ₂ to form PBBI N-oxide (PBBINO). The structure of PBBINO was verified by Fourier transform infrared spectroscopy (FT-IR) and the degree of oxidation...

article

Structural dynamics and charge transfer via complexation with fullerene in large area conjugated polymer honeycomb thin films ^†

Hsinhan Tsai, Zhihua Xu, Ranjith Krishna Pai, Leeyih Wang, more

Chemistry of Materials > 2011 > 23 > 3 > 759 - 761

article

Synthesis and Characterization of Ethylene Glycol Substituted Poly(phenylene Vinylene) Derivatives

Chun-Chih Wang, Hsinhan Tsai, Hung-Hsin Shih, Seaho Jeon, more

ACS Applied Materials & Interfaces > 2010 > 2 > 3 > 738 - 747

article

Thermochromism of a Poly(phenylene vinylene): Untangling the Roles of Polymer Aggregate and Chain Conformation

Chun-Chih Wang, Yuan Gao, Andrew P. Shreve, Chang Zhong, more

The Journal of Physical Chemistry B > 2009 > 113 > 50 > 16110 - 16117

article

Synthesis and Direct Visualization of Electroactive Unimolecular Core−Shell Nanoparticle

Chih-Fu Yeh, Pei-Ze Huang, Woei-Wu Pai, Leeyih Wang

Macromolecules > 2009 > 42 > 12 > 3873 - 3876

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Search results for: Leeyih Wang

Benzimidazole Based Hole‐Transporting Materials for High‐performance Inverted Perovskite Solar Cells

Improving Thermal and Photostability of Polymer Solar Cells by Robust Interface Engineering

Quasi‐2D Perovskite Crystalline Layers for Printable Direct Conversion X‐Ray Imaging

Enhancing Long‐Term Thermal Stability of Non‐Fullerene Organic Solar Cells Using Self‐Assembly Amphiphilic Dendritic Block Copolymer Interlayers

[60]Fullerene‐quinoxaline, benzothiadiazole and benzoselenadiazole based dyads for thermally stable polymer solar cells: anchoring of substituent on fullerene with a poly(3‐hexylthiophene) polymer chain

Increase of current density and luminance in organic light-emitting diode with reverse bias driving

Amino‐Acid‐Induced Preferential Orientation of Perovskite Crystals for Enhancing Interfacial Charge Transfer and Photovoltaic Performance

New donor–acceptor copolymers with ultra-narrow band gap for photovoltaic application

Self-organization and phase transformation of all π-conjugated diblock copolymers and its applications in organic solar cells

Polymer nanocomposite for improving light harvesting of perovskite solar cells

A new strategy for fabricating organic photovoltaic devices with stable D/A double-channel network to enhance performance using self-assembling all-conjugated diblock copolymer

Novel fulleropyrrolidines bearing π-conjugated thiophene derivatives as compatibilizing group for developing highly stable polymer solar cells

Effect of structural compatibility of dye and hole transport material on performance of solid-state dye-sensitized solar cells

Controlled Self-Aggregation of C ₆₀ -Anchored Multiarmed Polyacrylic Acids and Their Cytotoxicity Evaluation

Triphenylamine-substituted methanofullerene derivatives for enhanced open-circuit voltages and efficiencies in polymer solar cells

A novel biosensing mechanism based on a poly(N-butyl benzimidazole)-modified gold electrode for the detection of hydrogen peroxide

Structural dynamics and charge transfer via complexation with fullerene in large area conjugated polymer honeycomb thin films ^†

Synthesis and Characterization of Ethylene Glycol Substituted Poly(phenylene Vinylene) Derivatives

Thermochromism of a Poly(phenylene vinylene): Untangling the Roles of Polymer Aggregate and Chain Conformation

Synthesis and Direct Visualization of Electroactive Unimolecular Core−Shell Nanoparticle

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