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Ultrasmooth organic-inorganic perovskite thin-film formation and crystallization for efficient planar heterojunction solar cells.

Nature communications (2015)

Authors:

W Zhang, M Saliba, DT Moore, SK Pathak, MT Hörantner, T Stergiopoulos, SD Stranks, Giles Eperon, JA Alexander-Webber, A Abate, A Sadhanala, S Yao, Y Chen, RH Friend, LA Estroff, U Wiesner, Henry Snaith

Abstract:

To date, there have been a plethora of reports on different means to fabricate organic-inorganic metal halide perovskite thin films; however, the inorganic starting materials have been limited to halide-based anions. Here we study the role of the anions in the perovskite solution and their influence upon perovskite crystal growth, film formation and device performance. We find that by using a non-halide lead source (lead acetate) instead of lead chloride or iodide, the perovskite crystal growth is much faster, which allows us to obtain ultrasmooth and almost pinhole-free perovskite films by a simple one-step solution coating with only a few minutes annealing. This synthesis leads to improved device performance in planar heterojunction architectures and answers a critical question as to the role of the anion and excess organic component during crystallization. Our work paves the way to tune the crystal growth kinetics by simple chemistry.
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Hole-transport materials with greatly-differing redox potentials give efficient TiO2-[CH3NH3][PbX3] perovskite solar cells

Physical Chemistry Chemical Physics 17:4 (2015) 2335-2338

Authors:

A Abate, M Planells, DJ Hollman, V Barthi, S Chand, HJ Snaith, N Robertson

Abstract:

Two diacetylide-triphenylamine hole-transport materials (HTM) with varying redox potential have been applied in planar junction TiO2-[CH3NH3]PbI3-xClx solar cells leading to high power-conversion efficiencies up to 8.8%. More positive oxidation potential of the HTM gives higher VOC and lower JSC illustrating the role of matching energy levels, however both HTMs gave efficient cells despite a difference of 0.44 V in their redox potentials. This journal is
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Hole-transport materials with greatly-differing redox potentials give efficient TiO 2 –[CH 3 NH 3 ][PbX 3 ] perovskite solar cells

Physical Chemistry Chemical Physics Royal Society of Chemistry (RSC) 17:4 (2015) 2335-2338

Authors:

Antonio Abate, Miquel Planells, Derek J Hollman, Vishal Barthi, Suresh Chand, Henry J Snaith, Neil Robertson
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The real TiO 2 /HTM interface of solid-state dye solar cells: role of trapped states from a multiscale modelling perspective

Nanoscale Royal Society of Chemistry (RSC) 7:3 (2015) 1136-1144

Authors:

Alessio Gagliardi, Matthias Auf der Maur, Desiree Gentilini, Fabio di Fonzo, Agnese Abrusci, Henry J Snaith, Giorgio Divitini, Caterina Ducati, Aldo Di Carlo
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Deposition and post-processing techniques for transparent conductive films

(2015) 61433105

Authors:

MG Christoforo, S Mehra, A Salleo, P Peumans

Abstract:

In one embodiment, a method is provided for fabrication of a semitransparent conductive mesh. A first solution having conductive nanowires suspended therein and a second solution having nanoparticles suspended therein are sprayed toward a substrate, the spraying forming a mist. The mist is processed, while on the substrate, to provide a semitransparent conductive material in the form of a mesh having the conductive nanowires and nanoparticles. The nanoparticles are configured and arranged to direct light passing through the mesh. Connections between the nanowires provide conductivity through the mesh.