Publications by Amita Ummadisingu

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

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

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

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

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

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

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

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

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

Enhancing Efficiency of Perovskite Solar Cells via N-doped Graphene: Crystal Modification and Surface Passivation

Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Michael Saliba, Jingshan Luo, Antonio Abate, Juan-Pablo Correa-Baena, Jiyoun Seo, Amita Ummadisingu, Mahboobeh Hadadian

Controlling the morphology and surface passivation in perovskite solar cells is paramount in obtaining optimal opto-electronic properties. This study incorporates N-doped graphene nanosheets in the perovskite layer, which simultaneously induces an improved ...

2016

Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance

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

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 ...

2016

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Amita Ummadisingu

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

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

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

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

Spontaneous crystal coalescence enables highly efficient perovskite solar cells

Enhancing Efficiency of Perovskite Solar Cells via N-doped Graphene: Crystal Modification and Surface Passivation

Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance

Guanine‐Stabilized Formamidinium Lead Iodide Perovskites

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Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance

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

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

Spontaneous crystal coalescence enables highly efficient perovskite solar cells

Enhancing Efficiency of Perovskite Solar Cells via N-doped Graphene: Crystal Modification and Surface Passivation

Guanine‐Stabilized Formamidinium Lead Iodide Perovskites