Publications de Nripan Mathews

Hybrid 2D [Pb(CH3NH2)I-2](n) Coordination Polymer Precursor for Scalable Perovskite Deposition

Michael Graetzel, Nripan Mathews, Yang Li

A two-dimensional hybrid coordination polymer Pb(CH3NH2)I-2 featuring a well-defined layered structure is reported for scalable perovskite ink and deposition. This coordination polymer exhibits structural, spectroscopic, and physicochemical properties ...

AMER CHEMICAL SOC2020

Indirect tail states formation by thermal-induced polar fluctuations in halide perovskites

Michael Graetzel, Nripan Mathews, Qiang Xu, Bing Wu

Halide perovskites possess enormous potential for various optoelectronic applications. Presently, a clear understanding of the interplay between the lattice and electronic effects is still elusive. Specifically, the weakly absorbing tail states and dual em ...

Springer2019

Indirect tail states formation by thermal-induced polar fluctuations in halide perovskites (vol 10, 484, 2019)

Michael Graetzel, Nripan Mathews, Qiang Xu, Bing Wu

Springer2019

Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals

Michael Graetzel, Nripan Mathews, Qiang Xu, Mingjie Li

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 E-g, is a promising way to augment the photocurrent and overcome th ...

Nature Publishing Group2018

Effect of Cation Composition on the Mechanical Stability of Perovskite Solar Cells

Michael Saliba, Nripan Mathews

2018

Self-assembled hierarchical nanostructured perovskites enable highly efficient LEDs via an energy cascade

Nripan Mathews

2018

Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water-Splitting Devices

Michael Graetzel, Shaik Mohammed Zakeeruddin, Chenyi Yi, Nripan Mathews

Photoelectrochemical (PEC) cells are attractive for storing solar energy in chemical bonds through cleaving of water into oxygen and hydrogen. Although hematite (alpha-Fe2O3) is a promising photoanode material owing to its chemical stability, suitable band ...

Wiley-VCH Verlag Berlin2017

Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals

Michael Graetzel, Nripan Mathews, Qiang Xu

Multiphoton absorption processes enable many technologically important applications, such as in vivo imaging, photodynamic therapy and optical limiting, and so on. Specifically, higher-order nonlinear absorption such as five-photon absorption offers signif ...

Nature Publishing Group2017

Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals

Michael Graetzel, Nripan Mathews, Mingjie Li

Hot-carrier solar cells can overcome the Schottky-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 p ...

Nature Publishing Group2017

Identifying Fundamental Limitations in Halide Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Chenyi Yi, Nripan Mathews

The temperature dependence of the principal photovoltaic parameters of perovskite photovoltaics is studied. The recombination activation energy is in good agreement with the perovskite's bandgap energy, thereby placing an upper bound on the open-circuit vo ...

Wiley-Blackwell2016