Amita Ummadisingu

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Boosting the performance of Cu2O photocathodes for unassisted solar water splitting devices

Linfeng Pan, Jinhyun Kim, Ulf Anders Hagfeldt, Jingshan Luo, Matthew Thomas Mayer, Amita Ummadisingu, Minkyu Son

Although large research efforts have been devoted to photoelectrochemical (PEC) water splitting in the past several decades, the lack of efficient, stable and Earth-abundant photoelectrodes remains a bottleneck for practical application. Here, we report a ...

2018

Poly(ethylene glycol)-[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis

Shaik Mohammed Zakeeruddin, Wolfgang Richard Tress, Michael Saliba, Konrad Domanski, Amita Ummadisingu, Silver Hamill Turren Cruz, Philippe Jürgen Holzhey

2018

Revealing the detailed path of sequential deposition for metal halide perovskite formation

Amita Ummadisingu

2018

Fundamentals of perovskite formation for photovoltaics

Amita Ummadisingu

Perovskite solar cells have become strong contenders in the arena of photovoltaics due to the stunning rise in their efficiency from 3 % to over 20 % in just seven years. In this time, numerous device architectures and thin film deposition methods have bee ...

EPFL2018

11% efficiency solid-state dye-sensitized solar cells with copper(II/I) hole transport materials

Shaik Mohammed Zakeeruddin, Jacques-Edouard Moser, Ulf Anders Hagfeldt, Jingshan Luo, Fabrizio Giordano, Joël Teuscher, Norman Pellet, Yiming Cao, Amita Ummadisingu, Yasemin Saygili

Solid-state dye-sensitized solar cells currently suffer from issues such as inadequate nanopore filling, low conductivity and crystallization of hole-transport materials infiltrated in the mesoscopic TiO2 scaffolds, leading to low performances. Here we rep ...

Nature Publishing Group2017

The effect of illumination on the formation of metal halide perovskite films

Michael Graetzel, Wolfgang Richard Tress, Antonio Abate, Jiyoun Seo, Amita Ummadisingu, Ludmilla Steier, Taisuke Matsui

Optimizing the morphology of metal halide perovskite films is an important way to improve the performance of solar cells(1) when these materials are used as light harvesters(2), because film homogeneity is correlated with photovoltaic performance(3). Many ...

Nature Publishing Group2017

Additives, Hole Transporting Materials and Spectroscopic Methods to Characterize the Properties of Perovskite Films

Michael Graetzel, Shaik Mohammed Zakeeruddin, Nikolaos Vlachopoulos, Ulf Anders Hagfeldt, Michael Saliba, Jiyoun Seo, Amita Ummadisingu, Marko Stojanovic

The achievement of high efficiency and high stability in perovskite solar cells (PSCs) requires optimal selection and evaluation of the various components. After a brief introduction to the perovskite materials and their historical evolution, the first par ...

Schweizerische Chemische Gesellschaft2017

Spontaneous crystal coalescence enables highly efficient perovskite solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Michael Saliba, Antonio Abate, Juan-Pablo Correa-Baena, Amita Ummadisingu

Perovskite solar cells have recently reached staggering efficiencies, through efforts focused on reducing grain boundaries, by enlarging the size of the crystalline domains that constitute the perovskite films. Here, we demonstrate that smaller crystallite ...

Elsevier Science Bv2017

Ionic Liquid Control Crystal Growth to Enhance Planar Perovskite Solar Cells Efficiency

Michael Graetzel, Shaik Mohammed Zakeeruddin, Kurt Schenk, Ulf Anders Hagfeldt, Michael Saliba, Jingshan Luo, Antonio Abate, Fabrizio Giordano, Juan-Pablo Correa-Baena, Konrad Domanski

Ionic liquids can retard the perovskite crystallization with the aim to form compact films with larger and more uniformly distributed grain size. The ionic liquid driven crystallization is exploited to prepared a record planar perovskite solar cell with st ...

Wiley-VCH Verlag Berlin2016

Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance

Michael Graetzel, Shaik Mohammed Zakeeruddin, Wolfgang Richard Tress, Ulf Anders Hagfeldt, Michael Saliba, Antonio Abate, Juan-Pablo Correa-Baena, Konrad Domanski, Jiyoun Seo, Amita Ummadisingu

All of the cations currently used in perovskite solar cells abide by the tolerance factor for incorporation into the lattice. We show that the small and oxidation-stable rubidium cation (Rb+) can be embedded into a "cation cascade" to create perovskite mat ...

American Association for the Advancement of Science2016

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Fundamentals of perovskite formation for photovoltaics

Amita Ummadisingu

EPFL2018

Poly(ethylene glycol)-[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis

Shaik Mohammed Zakeeruddin, Wolfgang Richard Tress, Michael Saliba, Konrad Domanski, Amita Ummadisingu, Silver Hamill Turren Cruz, Philippe Jürgen Holzhey

2018