Publications by 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, Bing Wu, Qiang Xu

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, Bing Wu, Qiang Xu

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

Nripan Mathews, Michael Saliba

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

Lead-Free MA(2)CuCl(x)Br(4-x), Hybrid Perovskites

Michael Graetzel, Nripan Mathews, Shi Chen

Despite their extremely good performance in solar cells with efficiencies approaching 20% and the emerging application for light-emitting devices, organic-inorganic lead halide perovskites suffer from high content of toxic, polluting, and bioaccumulative P ...

American Chemical Society2016

Solution-Processed Tin-Based Perovskite for Near-Infrared Lasing

Michael Graetzel, Nripan Mathews

The family of solution-processed tin-based perovskites is demonstrated as a new and superior near-infrared gain medium. Due to the large electron-hole bimolecular recombination associated with tin and the reduced trap density with SnF2 treatment, these lea ...

Wiley-Blackwell2016

Perovskite-Hematite Tandem Cells for Efficient Overall Solar Driven Water Splitting

Michael Graetzel, Nripan Mathews

Photoelectrochemieal water splitting half reactions on semiconducting photoelectrodes have received much attention but efficient overall water splitting driven by a single photoelectrode has remained elusive due to stringent electronic and thermodynamic pr ...

American Chemical Society2015

Highly Spin-Polarized Carrier Dynamics and Ultra large Photoinduced Magnetization in CH(3)NH(3)Pbl(3) Perovskite Thin Films

Michael Graetzel, Nripan Mathews

Low-temperature solution-processed organic-inorganic halide perovskite CH3NH3PbI3 has demonstrated great potential for photovoltaics and light-emitting devices. Recent discoveries of long ambipolar carrier diffusion lengths and the prediction of the Rashba ...

American Chemical Society2015

Low-temperature solution-processed wavelength-tunable perovskites for lasing

Michael Graetzel, Nripan Mathews

Low-temperature solution-processed materials that show optical gain and can be embedded into a wide range of cavity resonators are attractive for the realization of on-chip coherent light sources. Organic semiconductors and colloidal quantum dots are consi ...

Nature Publishing Group2014

High efficiency electrospun TiO2 nanofiber based hybrid organic-inorganic perovskite solar cell

Michael Graetzel, Thi Thu Trang Pham, Nripan Mathews

The good electrical and morphological characteristics of TiO2 nanofibers and the high extinction coefficient of CH3NH3PbI3 perovskite are combined to obtain a solar cell with a power conversion efficiency of 9.8%. The increase of the film thickness dramati ...

Royal Society of Chemistry2014

Lead-Free Halide Perovskite Solar Cells with High Photocurrents Realized Through Vacancy Modulation

Michael Graetzel, Nripan Mathews

Lead free perovskite solar cells based on a CsSnI3 light absorber with a spectral response from 950 nm is demonstrated. The high photocurrents noted in the system are a consequence of SnF2 addition which reduces defect concentrations and hence the backgrou ...

Wiley-V C H Verlag Gmbh2014

A swivel-cruciform thiophene based hole-transporting material for efficient perovskite solar cells

Michael Graetzel, Satvasheel Powar, Nripan Mathews, Kunwu Fu

A novel swivel- cruciform 3,3'- bithiophene based hole- transporting material (HTM) with a low lying highest occupied molecular orbital (HOMO) level was synthesized. This new HTM (KTM3) in CH3NH3PbI3 perovskite solar cells showed a higher V-oc (1.08 V) and ...

Royal Society of Chemistry2014

On the Solar to Hydrogen Conversion Efficiency of Photoelectrodes for Water Splitting

Michael Graetzel, Takashi Hisatomi, Nripan Mathews

Amer Chemical Soc2014

In situ photo-assisted deposition of MoS2 electrocatalyst onto zinc cadmium sulphide nanoparticle surfaces to construct an efficient photocatalyst for hydrogen generation

Michael Graetzel, Nripan Mathews

We reported herein a facile and scalable preparation process for MoS2-decorated ZnxCd1-xS hybrid photocatalysts for hydrogen generation. ZnxCd1-xS nanopowder was first prepared from commercially available precursors employing a solution based process. MoS2 ...

Royal Society of Chemistry2013