Appointment: Director, Institute of Advanced Studies
Professor, School of Physical & Mathematical Sciences - Division of Physics & Applied Physics
Associate Dean (Research), College of Science

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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1 to 10 of 45 Results
Sep 19, 2022 - Fu Jianhui
Fu, Jianhui, 2022, "Replication Data for: Strain propagation in layered two-dimensional halide perovskites",, DR-NTU (Data), V1
Replication Data for: Strain propagation in layered two-dimensional halide perovskites published in Science Advances
Sep 17, 2022 - Feng Minjun
Feng, Minjun; Ye, Senyun; Guo, Yuanyuan; Sum, Tze Chien, 2022, "Replication Data for: Intrinsic Carrier Diffusion in Perovskite Thin Films undressed by Transient Reflectance Spectroscopy",, DR-NTU (Data), V1
Raw data for: Intrinsic Carrier Diffusion in Perovskite Thin Films undressed by Transient Reflectance Spectroscopy
Aug 2, 2022 - Zhang Qiannan
Zhang, Qiannan; Krisnanda, Tanjung; Giovanni, David; Dini, Kevin; Ye, Senyun; Feng, Minjun; Liew, Timothy C. H.; Sum, Tze Chien, 2022, "Replication Data for: Electric Field Modulation of 2D Perovskite Excitonics",, DR-NTU (Data), V1
Raw data for Electric Field Modulation of 2D Perovskite Excitonics
Jun 6, 2022 - Chan Kok Ken
Chan, Kok Ken, 2022, "Replication Data for: Water-stable Perovskite Quantum Dots-Based FRET Nanosensor for the Detection of Rhodamine 6G in Water, Food, and Biological Samples",, DR-NTU (Data), V1, UNF:6:DBhvRwxxlwI1iwvRkAnN1A== [fileUNF]
The practical application of perovskite quantum dots (QDs) for sensing in the aqueous phase has been restricted by their poor resistance to moisture and oxygen due to their highly ionic characteristic. In this work, we employed silica and phospholipid co-encapsulated water-stable...
Jan 28, 2022 - Ramesh Sankaran
Ramesh, Sankaran, 2022, "Replication Data for: Tailoring the Energy Manifold of Quasi-2D Perovskites for Efficient Carrier Extraction",, 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...
Jan 24, 2022 - Lim Jia Wei Melvin
Lim, Jia Wei Melvin, 2022, "Replication Data for: Spotlight on Hot Carriers in Halide Perovskite Luminescence",, 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...
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",, 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...
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",, 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...
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",, 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...
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",, 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...
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