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Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals

The hot carriers in halide perovskite nanocrystals cool much slower than those in conventional semiconductor nanocrystals due to the phonon bottleneck. Here, Li et al. demonstrate enhanced multiple exciton generation with lower threshold in intermediate-confined perovskite nanocrystals based on this effect.

Mingjie Li
Raihana Begum
Tze Chien Sum
ResearchOpen Access10 Oct 2018
Nature Communications

Volume: 9, P: 1-7
Low-temperature solution-processed wavelength-tunable perovskites for lasing

Hybrid halide perovskites have demonstrated promising performance as solar cells. It is now reported that these solution-processed materials are also suited to lasing applications, because of the high optical gain and stable amplified spontaneous emission they show in the visible spectral range.

Guichuan Xing
Nripan Mathews
Tze Chien Sum
Research16 Mar 2014
Nature Materials

Volume: 13, P: 476-480
Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals

Harvesting excess energy from above-band gap photons could lead to solar cells which exceed conventional efficiency limits. Liet al., study hot carrier cooling in hybrid perovskite materials with reduced dimensionality using transient absorption spectroscopy and demonstrate efficient hot-electron extraction in such systems.

Mingjie Li
Saikat Bhaumik
Tze Chien Sum
ResearchOpen Access08 Feb 2017
Nature Communications

Volume: 8, P: 1-10
Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals

The small high-order multi-photon action cross-section of traditional biological imaging media presents a fundamental limitation for deep-tissue nonlinear optical imaging. Here the authors overcome this limitation by employing multidimensional core–shell perovskite nanocrystals.

Weiqiang Chen
Saikat Bhaumik
Tze Chien Sum
ResearchOpen Access12 May 2017
Nature Communications

Volume: 8, P: 1-9
Ultrafast long-range spin-funneling in solution-processed Ruddlesden–Popper halide perovskites

Spin-information transport or transfer is essential for spintronics applications and often relies on high purity and quality materials. Here, the authors report on the defect-tolerant solution-processed Ruddlesden–Popper halide perovskites, where a spin propagation length of 600 nm was achieved via spin funneling.

David Giovanni
Jia Wei Melvin Lim
Tze Chien Sum
ResearchOpen Access01 Aug 2019
Nature Communications

Volume: 10, P: 1-8
Indirect tail states formation by thermal-induced polar fluctuations in halide perovskites

The weak effects induced by lattice disorder on the optoelectronic properties of halide perovskites still remain elusive. Here Wu et al. confirm the indirect transition tail states in perovskite crystals which explain their low photoluminescence quantum yield, dual emission peaks and difficulties in realizing lasing.

Bo Wu
Haifeng Yuan
Tze Chien Sum
ResearchOpen Access29 Jan 2019
Nature Communications

Volume: 10, P: 1-10
Mixed-Dimensional Naphthylmethylammonium-Methylammonium Lead Iodide Perovskites with Improved Thermal Stability

Bhumika Chaudhary
Teck M. Koh
Cesare Soci
ResearchOpen Access16 Jan 2020
Scientific Reports

Volume: 10, P: 1-11
Publisher Correction: Mixed-Dimensional Naphthylmethylammonium-Methylammonium Lead Iodide Perovskites with Improved Thermal Stability

Bhumika Chaudhary
Teck M. Koh
Cesare Soci
Amendments and CorrectionsOpen Access20 May 2020
Scientific Reports

Volume: 10, P: 1-2

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