SUM Tze Chien

Research topics:

Ultrafast optical spectroscopy and time-integrated optical spectroscopy of emergent nanoscale and light harvesting material systems:

• Investigating light matter interactions
• Energy and charge transfer mechanisms
• Probing carrier and quasi-particle dynamics

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21 to 30 of 61 Results

Replication Data for: Tailoring the Energy Manifold of Quasi-2D Perovskites for Efficient Carrier Extraction Jan 28, 2022 - RAMESH Sankaran Ramesh, Sankaran, 2022, "Replication Data for: Tailoring the Energy Manifold of Quasi-2D Perovskites for Efficient Carrier Extraction", https://doi.org/10.21979/N9/YXVNNF, DR-NTU (Data), V1 Harvesting the excess energy from absorbed above bandgap photons is a promising approach to overcome the detailed balance limit for higher solar cell efficiencies. However, this remains very challenging for 2D layered halide perovskites as the fast excess energy loss competes eff...
Replication Data for: Spotlight on Hot Carriers in Halide Perovskite Luminescence Jan 24, 2022 - LIM Jia Wei Melvin Lim, Jia Wei Melvin, 2022, "Replication Data for: Spotlight on Hot Carriers in Halide Perovskite Luminescence", https://doi.org/10.21979/N9/PMBK22, DR-NTU (Data), V1 Harnessing hot carriers’ (HC) excess energy is an attractive approach to surpass the Shockley-Queisser limit. Halide perovskites possess desirable slow HC cooling properties for developing next-generation solar cells. Their HC cooling properties on the ultrafast timescale are wel...
Replication Data for: Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths Oct 13, 2021 - RAMESH Sankaran Ramesh, Sankaran, 2021, "Replication Data for: Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths", https://doi.org/10.21979/N9/ORJLUR, DR-NTU (Data), V1 Perovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure-red (620−660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, a ge...
Replication Data for: Effect of Alloying on the Dynamics of Coherent Acoustic Phonons in Bismuth Double Perovskite Single Crystals Mar 18, 2021 - Zhang Qiannan Lin, Xihong; Wu, Bo; Ning, Weihua; Feng, Minjun; Xu, Qiang; Gao, Feng; Sum, Tze Chien; Zhou, Guofu, 2021, "Replication Data for: Effect of Alloying on the Dynamics of Coherent Acoustic Phonons in Bismuth Double Perovskite Single Crystals", https://doi.org/10.21979/N9/VATLX2, DR-NTU (Data), V1 The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and Tl-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects...
Replication Data for: Room Temperature Light-Mediated Long-Range Coupling of Excitons in Perovskites Mar 18, 2021 - Zhang Qiannan Krisnanda, Tanjung; Zhang, Qiannan; Dini, Kevin; Giovanni, David; Liew, Timothy C. H.; Sum, Tze Chien, 2021, "Replication Data for: Room Temperature Light-Mediated Long-Range Coupling of Excitons in Perovskites", https://doi.org/10.21979/N9/HEOAE7, DR-NTU (Data), V1 Perovskites have been the focus of attention due to their multitude of outstanding optoelectronic properties and structural versatility. Two-dimensional halide perovskite such as (C6H5C2H4NH3)2PbI4, or simply PEPI, forms natural multiple quantum wells with enhanced lightmatter in...
Replication Data for: Origins of the Long-Range Exciton Diffusion in Perovskite Nanocrystal Films: Photon Recycling vs Exciton Hopping Feb 25, 2021 - David Giovanni Giovanni, David; Righetto, Marcello; Zhang, Qiannan; Lim, Jia Wei Melvin; Ramesh, Sankaran; Sum, Tze Chien, 2021, "Replication Data for: Origins of the Long-Range Exciton Diffusion in Perovskite Nanocrystal Films: Photon Recycling vs Exciton Hopping", https://doi.org/10.21979/N9/6QTW2E, DR-NTU (Data), V1 The outstanding optoelectronic performance of lead halide perovskites lies in their exceptional carrier diffusion properties. As the perovskite material dimensionality is reduced to exploit the quantum confinement effects, the disruption to the perovskite lattice, often with insu...
Replication Data for: The Bright Side and Dark Side of Hybrid Organic–Inorganic Perovskites Feb 25, 2021 - Zhang Qiannan Walukiewicz, Wladek; Wang, Shu; Wu, Xinchun; Li, Rundong; Sherburne, Matthew P.; Wu, Bo; Sum, Tze Chien; Ager, Joel W.; Asta, Mark D., 2021, "Replication Data for: The Bright Side and Dark Side of Hybrid Organic–Inorganic Perovskites", https://doi.org/10.21979/N9/9LBMRG, DR-NTU (Data), V1 The previously developed bistable amphoteric native defect (BAND) model is used for a comprehensive explanation of the unique photophysical properties and for understanding the remarkable performance of perovskites as photovoltaic materials. It is shown that the amphoteric defect...
Replication Data for: Strong Self-trapping by Deformation Potential Limits Photovoltaic Performance in Bismuth Double Perovskite Feb 18, 2021 - FU Jianhui Fu, Jianhui, 2021, "Replication Data for: Strong Self-trapping by Deformation Potential Limits Photovoltaic Performance in Bismuth Double Perovskite", https://doi.org/10.21979/N9/LTPBM2, DR-NTU (Data), V1 Replication data for the paper including the raw data, processed data and figures. DOI: Sci. Adv. 2021; 7 : eabd3160
Replication Data for: Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites Feb 16, 2021 - FU Jianhui Fu, Jianhui; Li, Mingjie; Solanki, Ankur; Xu, Qiang; Lekina, Yulia; Ramesh, Sankaran; Shen, Ze Xiang; Sum, Tze Chien, 2021, "Replication Data for: Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites", https://doi.org/10.21979/N9/D8BMV2, DR-NTU (Data), V1 Replication data for this paper published in Adv. Mater. including raw data, processed data and figures. DOI:10.1002/adma.202006233
Replication Data for: The Physics of Interlayer Exciton Delocalization in Ruddlesden Popper Lead Halide Perovskites Dec 19, 2020 - RAMESH Sankaran Ramesh, Sankaran, 2020, "Replication Data for: The Physics of Interlayer Exciton Delocalization in Ruddlesden Popper Lead Halide Perovskites", https://doi.org/10.21979/N9/OIYOW1, DR-NTU (Data), V2 Abstract: Two-dimensional (2D) lead halide Ruddlesden-Popper perovskites (RPP) recently emerged as a prospective material system for optoelectronic applications. Their self-assembled multi quantum-well structure gives rise to the novel inter-well energy funnelling phenomenon, whi...

Replication Data for: Tailoring the Energy Manifold of Quasi-2D Perovskites for Efficient Carrier Extraction

Jan 28, 2022 - RAMESH Sankaran

Ramesh, Sankaran, 2022, "Replication Data for: Tailoring the Energy Manifold of Quasi-2D Perovskites for Efficient Carrier Extraction", https://doi.org/10.21979/N9/YXVNNF, DR-NTU (Data), V1

Harvesting the excess energy from absorbed above bandgap photons is a promising approach to overcome the detailed balance limit for higher solar cell efficiencies. However, this remains very challenging for 2D layered halide perovskites as the fast excess energy loss competes eff...

Replication Data for: Spotlight on Hot Carriers in Halide Perovskite Luminescence

Jan 24, 2022 - LIM Jia Wei Melvin

Lim, Jia Wei Melvin, 2022, "Replication Data for: Spotlight on Hot Carriers in Halide Perovskite Luminescence", https://doi.org/10.21979/N9/PMBK22, DR-NTU (Data), V1

Harnessing hot carriers’ (HC) excess energy is an attractive approach to surpass the Shockley-Queisser limit. Halide perovskites possess desirable slow HC cooling properties for developing next-generation solar cells. Their HC cooling properties on the ultrafast timescale are wel...

Replication Data for: Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths

Oct 13, 2021 - RAMESH Sankaran

Ramesh, Sankaran, 2021, "Replication Data for: Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths", https://doi.org/10.21979/N9/ORJLUR, DR-NTU (Data), V1

Perovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure-red (620−660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, a ge...

Replication Data for: Effect of Alloying on the Dynamics of Coherent Acoustic Phonons in Bismuth Double Perovskite Single Crystals

Mar 18, 2021 - Zhang Qiannan

Lin, Xihong; Wu, Bo; Ning, Weihua; Feng, Minjun; Xu, Qiang; Gao, Feng; Sum, Tze Chien; Zhou, Guofu, 2021, "Replication Data for: Effect of Alloying on the Dynamics of Coherent Acoustic Phonons in Bismuth Double Perovskite Single Crystals", https://doi.org/10.21979/N9/VATLX2, DR-NTU (Data), V1

The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and Tl-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects...

Replication Data for: Room Temperature Light-Mediated Long-Range Coupling of Excitons in Perovskites

Mar 18, 2021 - Zhang Qiannan

Krisnanda, Tanjung; Zhang, Qiannan; Dini, Kevin; Giovanni, David; Liew, Timothy C. H.; Sum, Tze Chien, 2021, "Replication Data for: Room Temperature Light-Mediated Long-Range Coupling of Excitons in Perovskites", https://doi.org/10.21979/N9/HEOAE7, DR-NTU (Data), V1

Perovskites have been the focus of attention due to their multitude of outstanding optoelectronic properties and structural versatility. Two-dimensional halide perovskite such as (C6H5C2H4NH3)2PbI4, or simply PEPI, forms natural multiple quantum wells with enhanced lightmatter in...

Replication Data for: Origins of the Long-Range Exciton Diffusion in Perovskite Nanocrystal Films: Photon Recycling vs Exciton Hopping

Feb 25, 2021 - David Giovanni

Giovanni, David; Righetto, Marcello; Zhang, Qiannan; Lim, Jia Wei Melvin; Ramesh, Sankaran; Sum, Tze Chien, 2021, "Replication Data for: Origins of the Long-Range Exciton Diffusion in Perovskite Nanocrystal Films: Photon Recycling vs Exciton Hopping", https://doi.org/10.21979/N9/6QTW2E, DR-NTU (Data), V1

The outstanding optoelectronic performance of lead halide perovskites lies in their exceptional carrier diffusion properties. As the perovskite material dimensionality is reduced to exploit the quantum confinement effects, the disruption to the perovskite lattice, often with insu...

Replication Data for: The Bright Side and Dark Side of Hybrid Organic–Inorganic Perovskites

Feb 25, 2021 - Zhang Qiannan

Walukiewicz, Wladek; Wang, Shu; Wu, Xinchun; Li, Rundong; Sherburne, Matthew P.; Wu, Bo; Sum, Tze Chien; Ager, Joel W.; Asta, Mark D., 2021, "Replication Data for: The Bright Side and Dark Side of Hybrid Organic–Inorganic Perovskites", https://doi.org/10.21979/N9/9LBMRG, DR-NTU (Data), V1

The previously developed bistable amphoteric native defect (BAND) model is used for a comprehensive explanation of the unique photophysical properties and for understanding the remarkable performance of perovskites as photovoltaic materials. It is shown that the amphoteric defect...

Replication Data for: Strong Self-trapping by Deformation Potential Limits Photovoltaic Performance in Bismuth Double Perovskite

Feb 18, 2021 - FU Jianhui

Fu, Jianhui, 2021, "Replication Data for: Strong Self-trapping by Deformation Potential Limits Photovoltaic Performance in Bismuth Double Perovskite", https://doi.org/10.21979/N9/LTPBM2, DR-NTU (Data), V1

Replication data for the paper including the raw data, processed data and figures. DOI: Sci. Adv. 2021; 7 : eabd3160

Replication Data for: Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites

Feb 16, 2021 - FU Jianhui

Fu, Jianhui; Li, Mingjie; Solanki, Ankur; Xu, Qiang; Lekina, Yulia; Ramesh, Sankaran; Shen, Ze Xiang; Sum, Tze Chien, 2021, "Replication Data for: Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites", https://doi.org/10.21979/N9/D8BMV2, DR-NTU (Data), V1

Replication data for this paper published in Adv. Mater. including raw data, processed data and figures. DOI:10.1002/adma.202006233

Replication Data for: The Physics of Interlayer Exciton Delocalization in Ruddlesden Popper Lead Halide Perovskites

Dec 19, 2020 - RAMESH Sankaran

Ramesh, Sankaran, 2020, "Replication Data for: The Physics of Interlayer Exciton Delocalization in Ruddlesden Popper Lead Halide Perovskites", https://doi.org/10.21979/N9/OIYOW1, DR-NTU (Data), V2

Abstract: Two-dimensional (2D) lead halide Ruddlesden-Popper perovskites (RPP) recently emerged as a prospective material system for optoelectronic applications. Their self-assembled multi quantum-well structure gives rise to the novel inter-well energy funnelling phenomenon, whi...

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