Eric Wei‐Guang Diau

National Yang Ming Chiao Tung University

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Sudhakar Narra

National Yang Ming Chiao Tung University

Hui‐Ping Wu

Sun Yat-sen University

Efat Jokar

Sungkyunkwan University

Ahmed H. Zewail

California Institute of Technology

Liyang Luo

Huazhong University of Science and Technology

Chen‐Hsiung Hung

Institute of Chemistry, Academia Sinica

Nobuhiro Ohta

National Yang Ming Chiao Tung University

Kamlesh Awasthi

National Yang Ming Chiao Tung University

Ching‐Yao Lin

AECOM (China)

Chen‐Yu Yeh

National Chung Hsing University

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National Yang Ming Chiao Tung University

262

National Taiwan University

National Tsing Hua University

Institute of Chemistry, Academia Sinica

Academia Sinica

National Cheng Kung University

National Chung Hsing University

National Central University

National Chi Nan University

National Synchrotron Radiation Research Center

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Enhanced light harvesting in mesoporous TiO2/P3HT hybrid solar cells using a porphyrin dye

Chemical Communications (2011)

Soo‐Jin Moon Etienne Baranoff Shaik M. Zakeeruddin Chen‐Yu Yeh Eric Wei‐Guang Diau

We report panchromatic light harvesting in hybrid TiO(2)/P3HT photovoltaic devices using a porphyrin dye that complements the light absorption of P3HT. The high short circuit photocurrent (12.1 mA cm(-2)) obtained is found to be due, in part, to Förster resonance energy transfer from the P3HT to the dye.

Photocurrent

Panchromatic film

10.1039/c1cc12251g

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Citations (64)

Influence of Phenylethynylene of Push–Pull Zinc Porphyrins on the Photovoltaic Performance

ACS Applied Materials & Interfaces (2016)

Hsien‐Hsin Chou Kamani Sudhir K. Reddy Hui‐Ping Wu Bo-Cheng Guo Hsuan‐Wei Lee

A series of zinc porphyrin dyes YD22-YD28 were synthesized and used for dye-sensitized solar cells. Dyes YD26-YD28 consist of zinc porphyrin (ZnP) as core unit, arylamine (Am) as electron-donating group, and p-ethynylbenzoic acid (EBA) as an electron-withdrawing/-anchoring group. The dyes YD22-YD25 contain additional phenylethynylene group (PE) bridged between Am and ZnP units. The influence of the PE unit on molecular properties as well as photovoltaic performances were investigated via photophysical and electrochemical studies and density functional calculations. With the insertion of PE unit, the dyes YD22-YD25 possess better light-harvesting properties in terms of significantly red-shifted Q-band absorption. The conversion efficiencies for dyes YD22-YD25 are better than those of dyes YD26-YD28 owing to larger J(SC) output. Natural transition orbitals and Mulliken charge analysis were used to analyze the electron injection efficiency for porphyrin dyes upon time-dependent DFT calculations. The results indicated that insertion of additional PE unit is beneficial to higher J(SC) by means of improved light-harvesting property due to broadened and red-shifted absorption.

HOMO/LUMO

Polar effect

10.1021/acsami.5b11554

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Citations (50)

Morphology-Dependent Charge-Separated Character in the Photoexcited States of the Photocatalytic Bismuth Oxyiodide Nanocrystals and Nanosheets: Implications for Photodynamic Therapy

ACS Applied Nano Materials (2025)

Shailesh Rana I‐Hua Tsai Kamlesh Awasthi Sudhakar Narra Sumit S. Bhosale

Bismuth oxyiodide (BiOI), a two-dimensional material, is well known for its photocatalytic and photovoltaic properties owing to its low bandgap, efficient charge separation, and suitable work function that facilitates various photocatalytic reactions. However, the performance of BiOI depends on the synthetic methods, as they dictate the growth directions and overall quality of the nanosheets or crystals produced. Herein, we investigated the morphology and the charge-separated character in the photoexcited states of the BiOI nanocrystals/sheets produced from alternative synthetic routes such as hydrothermal, ball milling, and hand grinding methods by using electroabsorption (E-A) spectroscopy. The optical band gaps, absorption, and E-A spectra of BiOI are shown to be sensitive to the synthetic method. The E-A spectra of BiOI nanocrystals/sheets embedded in poly(methyl methacrylate) (PMMA) matrix measured at the second harmonic of the applied field were simulated by using integral method analysis to estimate the changes in electric dipole moment and polarizability following photoexcitation. From the analysis, it is found that BiOI nanosheets prepared using a hand grinding method with a [001] orientation have much larger charge-separated character in the photoexcited states than those in the nanoparticles prepared from hydrothermal and ball milling methods with a [110] orientation, implying the excellent photoelectronic performance in BiOI nanosheets prepared by the hand grinding method in comparison with BiOI nanoparticles prepared by other methods. The present finding may open the gateway for the development of the specific BiOI material, which is suitable for photocatalysis and photodynamic therapy.

Bismuth

Morphology

10.1021/acsanm.4c06892

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Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

NPG Asia Materials (2014)

Lu-Lin Li Hsin-Hui Wu Chia-Hung Tsai Eric Wei‐Guang Diau

We report a two-step dip-coating approach for the fabrication of self-assembled monolayers of platinum nanocrystals (SAM-Pt) with a particle size of ∼3 nm and that are uniformly deposited on a transparent conducting oxide (TCO) surface to serve as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). In the first step, we prepared a polyol solution containing H2PtCl6 and ethylene glycol at 110 °C, in which the reduction kinetics were controlled by adding various proportions of NaOH. In the second step, we immersed a thiol-modified TCO substrate into the polyol solution with monodispersed Pt nanoparticles prepared at pH 3.7 at approximately 295 K to complete the nanofabrication. The DSSC devices using Z907 dye as a photosensitizer and the CE prepared using this SAM-Pt approach attained notable photovoltaic performance (η=9.2%) comparable with those fabricated using a conventional thermal decomposition method (η=9.1%) or a cyclic electrodeposition method (η=9.3%) under the same experimental conditions. We emphasize that the SAM-Pt films feature a clean surface, uniform morphology, narrow size distribution, small Pt loading and great catalytic activity; the present approach is hence not only suitable for DSSCs but also applicable for many other energy-related applications that require platinum as an efficient catalyst. Eric Wei-Guang Diau and colleagues at National Chiao Tung University in Taiwan have developed a technique to fabricate uniform platinum layers as electrodes for solar cells. Platinum is a catalyst that plays an important role in many electrochemical applications such as water splitting, fuel cells and solar cells. However, the thick films of platinum that are used add cost to these devices. The researchers have reduced this cost by developing a self-assembly method to deposit monolayers of platinum nanoparticles with a mean size of 3 nanometers at room temperature. The method involves functionalizing an electrode substrate with molecules that specifically attach to the platinum nanoparticles. Hence, when the electrode is dipped into a solution of platinum nanoparticles well prepared by controlling the pH values, a uniformly covered surface forms. In initial tests, these electrodes show very good photovoltaic properties, making the new fabrication technique even more attractive. A novel two-step approach is presented for the fabrication of self-assembled monolayers of platinum nanocrystals (SAM-Pt) uniformly deposited on a transparent conducting oxide (TCO) surface to serve as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). A true self-assembled Pt nanocrystalline monolayer with a mean particle size of ∼3 nm at facet {111} was unambiguously observed in the high-resolution TEM images. We emphasize that the SAM-Pt films feature a clean surface, uniform morphology, narrow size distribution, small Pt loading and great catalytic activity; the present approach is hence not only suitable for DSSCs but is also promising for many other energy-related applications that require platinum as an efficient catalyst to expedite the oxygen reduction reaction (ORR).

Platinum nanoparticles

Auxiliary electrode

10.1038/am.2014.57

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Citations (16)

Optical Characterizations for Broadening Emissions from Doping of the Two-Dimensional Tin–Lead Perovskite Films

The Journal of Physical Chemistry C (2024)

Sudhakar Narra Wei‐Chuan Chen Ashank Seetharaman I‐Hua Tsai Eric Wei‐Guang Diau

In this work, we present the optical properties of two-dimensional (2D) perovskite films of BA2SnxPb(1–x)I4 with x = 0–1. The excitonic absorption peaks of the fabricated perovskite samples were shown to shift to lower energies with increase of the Sn proportions in the films, whereas their emission spectra were shown to display dramatic Stokes shifts and spectral broadening from 600 to 1100 nm when compared with their pristine analogues. Power-dependent PL studies indicate that the emissions in the fabricated 2D perovskite samples arise from the self-trapping of excitons, while the spectral broadening originates from the production of multiple defect states upon doping of small amounts of Sn in the Pb-rich samples. The bandwidths of the emission spectra of the Pb–Sn mixed 2D perovskite samples were larger when the Pb proportion was higher than the Sn proportion, a key indicator for increasing the bandwidth of the white-light emission. TA spectral studies reveal that the nature of trap states plays a prominent role in the spectral broadening of the emission of the Pb-rich perovskite samples.

Tin dioxide

10.1021/acs.jpcc.3c07717

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Citations (1)

Size-Controlled Anatase Titania Single Crystals with Octahedron-like Morphology for Dye-Sensitized Solar Cells

ACS Nano (2012)

Jia‐Wei Shiu Chi‐Ming Lan Yung-Chia Chang Hui‐Ping Wu Wei‐Kai Huang

A simple hydrothermal method with titanium tetraisopropoxide (TTIP) as a precursor and triethanolamine (TEOA) as a chelating agent enabled growth in the presence of a base (diethylamine, DEA) of anatase titania nanocrystals (HD1–HD5) of controlled size. DEA played a key role to expedite this growth, for which a biphasic crystal growth mechanism is proposed. The produced single crystals of titania show octahedron-like morphology with sizes in a broad range of 30–400 nm; a typical, extra large, octahedral single crystal (HD5) of length 410 nm and width 260 nm was obtained after repeating a sequential hydrothermal treatment using HD3 and then HD4 as a seed crystal. The nanocrystals of size ∼30 nm (HD1) and ∼300 nm (HD5) served as active layer and scattering layer, respectively, to fabricate N719-sensitized solar cells. These HD devices showed greater VOC than devices of conventional nanoparticle (NP) type; the overall device performance of HD attained an efficiency of 10.2% power conversion at a total film thickness of 28 μm, which is superior to that of a NP-based reference device (η = 9.6%) optimized at a total film thickness of 18–20 μm. According to results obtained from transient photoelectric and charge extraction measurements, this superior performance of HD devices relative to their NP counterparts is due to the more rapid electron transport and greater TiO2 potential.

Morphology

10.1021/nn3042418

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Citations (87)

Theoretical aspects of H/N/O-chemistry relevant to the thermal reduction of NO by H2

Progress in Energy and Combustion Science (1995)

Eric Wei‐Guang Diau M. C. Lin Yongqin He Carl F. Melius

Elementary reaction

Atmospheric temperature range

Reaction rate

10.1016/0360-1285(94)00021-u

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Citations (28)

Functionalized Thienopyrazines on NiOx Film as Self‐Assembled Monolayer for Efficient Tin‐Perovskite Solar Cells Using a Two‐Step Method

Angewandte Chemie International Edition (2024)

Chun‐Hsiao Kuan Shakil N. Afraj Yuling Huang Arulmozhi Velusamy Cheng‐Liang Liu

Three functionalized thienopyrazines (TPs), TP-MN (1), TP-CA (2), and TPT-MN (3) were designed and synthesized as self-assembled monolayers (SAMs) deposited on the NiOx film for tin-perovskite solar cells (TPSCs). Thermal, optical, electrochemical, morphological, crystallinity, hole mobility, and charge recombination properties, as well as DFT-derived energy levels with electrostatic surface potential mapping of these SAMs, have been thoroughly investigated and discussed. The structure of the TP-MN (1) single crystal was successfully grown and analyzed to support the uniform SAM produced on the ITO/NiOx substrate. When we used NiOx as HTM in TPSC, the device showed poor performance. To improve the efficiency of TPSC, we utilized a combination of new organic SAMs with NiOx as HTM, the TPSC device exhibited the highest PCE of 7.7 % for TP-MN (1). Hence, the designed NiOx/TP-MN (1) acts as a new model system for the development of efficient SAM-based TPSC. To the best of our knowledge, the combination of organic SAMs with anchoring CN/CN or CN/COOH groups and NiOx as HTM for TPSC has never been reported elsewhere. The TPSC device based on the NiOx/TP-MN bilayer exhibits great enduring stability for performance, retaining ~80 % of its original value for shelf storage over 4000 h.

10.1002/anie.202407228

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Citations (1)

Application of a natural antioxidant as an efficient strategy to decrease the oxidation in Sn-based perovskites

Journal of Alloys and Compounds (2020)

Hamideh Mohammadian-Sarcheshmeh Mohammad Mazloum‐Ardakani Mohammad Rameez Saeed Shahbazi Eric Wei‐Guang Diau

Environmentally Friendly

SN2 reaction

Carbon fibers

10.1016/j.jallcom.2020.156351

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Citations (17)