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Sum Tze Chien (Nanyang Technological University)
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Appointment: Professor

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

For more information, visit webpage 1, webpage 2

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1 to 8 of 8 Results
Aug 1, 2019
Giovanni, David; Lim, Jia Wei Melvin; Yuan, Zhongcheng; Lim, Swee Sien; Righetto, Marcello; Qing, Jian; Zhang, Qiannan; Dewi, Herlina Arianita; Gao, Feng; Mhaisalkar, Subodh Gautam; Mathews, Nripan; Sum, Tze Chien, 2019, "Replication Data For: Ultrafast long-range spin-funneling in solution-processed Ruddlesden-Popper halide perovskites", https://doi.org/10.21979/N9/DUMOTD, DR-NTU (Data), V1
Room-temperature spin-based electronics is the vision of spintronics. Presently, there are few suitable material systems. Herein, we reveal that solution-processed mixed-phase Ruddlesden-Popper perovskite thin-films transcend the challenges of phonon momentum-scattering that limi...
May 31, 2019
Giovanni, David; Chong, Wee Kiang; Dewi, Herlina Arianita; Thirumal, Krishnamoorthy; Neogi, Ishita; Ramesh, Ramamoorthy; Mhaisalkar, Subodh; Mathews, Nripan; Sum, Tze Chien, 2019, "Replication Data for: Tunable room-temperature spin-selective optical Stark effect in solution-processed layered halide perovskites", https://doi.org/10.21979/N9/BWMJDV, DR-NTU (Data), V2
Ultrafast spin manipulation for opto–spin logic applications requires material systems that have strong spinselective light-matter interaction. Conventional inorganic semiconductor nanostructures [for example, epitaxial II-VI quantum dots and III-V multiple quantum wells (MQWs)]...
May 31, 2019 - Ankur Solanki
Ankur Solanki; Pankaj Yadav; Silver-Hamill Turren-Cruz; Swee Sien Lim; Michael Saliba; Sum Tze Chien, 2019, "Replication Data for: Cation influence on carrier dynamics in perovskite solar cells", https://doi.org/10.21979/N9/KAG1U8, DR-NTU (Data), V1
Rubidium and Cesium cations (Rb+ and Cs+) incorporation recently emerged as a viable strategy to enhance perovskite solar cells (PSCs) efficiency. However, a clear understanding of the impact of these cations on the structure-function relationship in relation to the device perfor...
Apr 15, 2019 - Li Mingjie
Li, Mingjie; Qi Wei; Subas Kumar Muduli; Natalia Yantara; Qiang Xu; Nripan Mathews; Subodh G. Mhaisalkar; Guichuan Xing; Tze Chien Sum, 2019, "Replication Data for: Enhanced Exciton and Photon Confnement in Ruddlesden–Popper Perovskite Microplatelets for Highly Stable Low-Threshold Polarized Lasing", https://doi.org/10.21979/N9/VEJNT0, DR-NTU (Data), V1
At the heart of electrically driven semiconductors lasers lies their gain medium that typically comprises epitaxially grown double heterostuctures or multiple quantum wells. The simultaneous spatial confinement of charge carriers and photons afforded by the smaller bandgaps and h...
Mar 18, 2019 - Li Mingjie
Li, Mingjie; Saikat Bhaumik; Teck Wee Goh; Muduli Subas Kumar; Natalia Yantara; Michael Gra¨tzel; Subodh Mhaisalkar; Nripan Mathews; Tze Chien Sum, 2019, "Replication Data for: Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals", https://doi.org/10.21979/N9/U8RXH5, DR-NTU (Data), V1
Hot-carrier solar cells can overcome the Shockley–Queisser limit by harvesting excess energy from hot carriers. Inorganic semiconductor nanocrystals are considered prime candidates. However, hot-carrier harvesting is compromised by competitive relaxation pathways (for example, in...
Jan 15, 2019 - Li Mingjie
Li, Mingjie; Raihana Begum; Jianhui Fu; Qiang Xu; Teck Ming Koh; Sjoerd A. Veldhuis; Michael Grätzel; Nripan Mathews; Subodh Mhaisalkar; Tze Chien Sum, 2019, "Replication Data for: Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals", https://doi.org/10.21979/N9/HJGXR3, DR-NTU (Data), V1
Multiple exciton generation (MEG) or carrier multiplication, a process that spawns two or more electron–hole pairs from an absorbed high-energy photon (larger than two times bandgap energy Eg), is a promising way to augment the photocurrent and overcome the Shockley–Queisser limi...
Sep 10, 2018
Chong, Wee Kiang; Thirumal, Krishnamoorthy; Giovanni, David; Goh, Teck Wee; Liu, Xinfeng; Mathews, Nripan; Mhaisalkar, Subodh; Sum, Tze Chien, 2018, "Replication Data for: Dominant factors limiting the optical gain in layered two-dimensional halide perovskite thin films", https://doi.org/10.21979/N9/WJSVVC, DR-NTU (Data), V1
Semiconductors are ubiquitous gain media for coherent light sources. Solution-processed three-dimensional (3D) halide perovskites (e.g., CH3NH3PbI3) with their outstanding room temperature optical gain properties are the latest members of this family. Their two-dimensional (2D) l...
Sep 10, 2018
Peng, Bo; Yu, Guannan; Zhao, Yawen; Xu, Qiang; Xing, Guichuan; Liu, Xinfeng; Fu, Deyi; Liu, Bo; Tan, Jun Rong Sherman; Tang, Wei; Lu, Haipeng; Xie, Jianliang; Deng, Longjiang; Sum, Tze Chien; Loh, Kian Ping, 2018, "Replication Data for: Achieving ultrafast hole transfer at the monolayer MoS2 and CH3NH3PbI3 perovskite interface by defect engineering", https://doi.org/10.21979/N9/VLN4DH, DR-NTU (Data), V1
The performance of a photovoltaic device is strongly dependent on the light harvesting properties of the absorber layer as well as the charge separation at the donor/acceptor interfaces.Atomically thin two-dimensional transition metal dichalcogenides (2- D TMDCs) exhibit strong l...
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DR-NTU (Data) will not be available on 19th August 2019, from 9:30am to 12 noon