Daniel Amgar, Tal Binyamin, Vladimir Uvarov, and Lioz. Etgar. 2/19/2018. “Near ultra-violet to mid-visible band gap tuning of mixed cation RbxCs1-xPbX3 (X=Cl or Br) perovskite nanoparticles.” Nanoscale, 2018,: DOI: 10.1039/C7NR09607K. near_ultra-violet_to_mid-visible_band_gap_tuning_of_mixed_cation.pdf
Yanqi Luo, Sigalit Aharon, Michael Stuckelberger, Ernesto Magaña, Barry Lai, Mariana I. Bertoni, Etgar Lioz, and David P. Fenning. 2/2018. “The Relationship between Chemical Flexibility and Nanoscale Charge Collection in Hybrid Halide Perovskites.” Adv. Funct. Mater., 1706995: 1-22. luo_et_al-2018-advanced_functional_materials.pdf
Lior Iagher and Etgar Lioz. 1/10/2018. “The Effect of Cs on the Stability and Photovoltaic Performance of 2D/3D Perovskite-based Solar Cells.” ACS Energy Lett., DOI: 10.1021/acsenergylett.7b01196. effect_of_cs_on_the_stability_and_photovoltaic.pdf
Yong Huang, Alexandre Gheno, Alain Rolland, Laurent Pedesseau, Sylvain Vedraine, Olivier Durand, Johann Bouclé, James P. Connolly, Lioz. Etgar, and Jacky Even. 1/4/2018. “A new approach to modelling Kelvin probe forcemicroscopy of hetero-structures in the darkand under illumination.” Opt Quant Electron, 2018,50: 40. a_new_approach_to_modelling_kelvin_probe_force.pdf
Etgar Lioz. 1/2018. “The merit of perovskite’s dimensionality; can this replace the 3D halideperovskite?.” Energy Environ. Sci., 2018: DOI: 10.1039/C7EE03397D. c7ee03397d.pdf
Tufan Ghosh, Sigalit Aharon, Etgar Lioz, and Sanford Ruhman. 12/5/2017. “Free carrier emergence and onset of electron-phononcoupling in methylammonium lead halide perovskite films.” Journal of the American Chemical Society, DOI: 10.1021/jacs.7b09508. free_carrier_emergence_and_onset_of_electron-phonon_coupling_in_methylammonium_lead_halide_perovskite_films.pdf
Daniel Amgar, Małgorzata Wierzbowska, Vladimir Uvarov, Vitaly Gutkin, and Etgar Lioz. 10/23/2017. “Novel Rubidium lead chloride nanocrystals: Synthesis and characterization.” Nano Futures, 1: 021002. novel_rubidium_lead_chloride_nanocrystals.pdf
Stav Rahmany, Michael Layani, Shlomo Magdassi, and Etgar Lioz. 9/24/2017. “Fully functional semi-transparent perovskitesolar cell fabricated at ambient air.” Energy & Fuels, DOI: 10.1039/c7se00383h. fully_functional_semi-transparent.pdf fully_functional.png
Ravi K. Misra, Bat-El Cohen, Lior Iagher, and Etgar Lioz. 8/28/2017. “Low-Dimensional Organic–Inorganic Halide Perovskite:Structure, Properties, and Applications.” ChemSusChem, 2017,10: 3712 – 3721. low_dimensional_organic_inorganic.png low-dimensional_organic-inorganic_halide_perovskite.pdf
Bat-El Cohen, Malgorzata Wierzbowska, and Etgar Lioz. 8/10/2017. “High efficiency quasi 2D lead bromide perovskitesolar cells using various barrier molecules.” Sustainable Energy & Fuels, 2017,1: 1935–1943. high_efficiency_quasi_2d_lead_bromide_perovskite.pdf high_efficiency_quasi_2d_1.png
Y. Huang, S. Aharon, A. Rolland, L. Pedesseau, O. Durand, L. Etgar, and J. Even. 5/19/2017. “Influence of Schottky contact on the C-V and J-V characteristicsof HTM-free perovskite solar cells.” EPJ Photovoltaics, 2017,8: 85501.Abstract

Abstract The influence of the Schottky contact is studied for hole transport material (HTM) free
CH3NH3PbI3 perovskite solar cells (PSCs), by using drift-diffusion and small signal models. The basic
current-voltage and capacitance-voltage characteristics are simulated in reasonable agreement with experimental
data. The build in potential of the finite CH3NH3PbI3 layer is extracted from a Mott-Schottky
capacitance analysis. Furthermore, hole collector conductors with work-functions of more than 5.5 eV are
proposed as solutions for high efficiency HTM-free CH3NH3PbI3 PSCs.

Chongwen Li, Yuanyuan Zhou, Yue Chang Li Wang, Yingxia Zong, Etgar Lioz, Guanglei Cui, Nitin P. Padture, and Shuping Pang. 5/19/2017. “Methylammonium-Mediated Evolution of Mixed-Organic-CationPerovskite Thin Films: A Dynamic Composition-Tuning Process.” Angew. Chem. Int. Ed., 2017,56: 7674 –7678. methylammonium.png methylammonium-mediated_evolution_of_mixed-organic-cation.pdf
Yue Chang, Li Wang, Jiliang Zhang, Zhongmin Zhou, Chongwen Li, Bingbing Chen, Etgar Lioz, Guanglei Cui, and Shuping Pang. 2/10/2017. “CH3NH2 gas induced (110) preferred cesiumcontainingperovskite films with reduced PbI6octahedron distortion and enhanced moisturestability.” J. Mater. Chem. A, 2017,5: 4803–4808.Abstract

We report here the discovery of a fancy interaction between cesium iodide (CsI) and methylamine (CH3NH2) due to the presence of the hydrogen bond. The formed CsI$xCH3NH2 is a liquid phase, which facilitates the large scale fabrication of highly uniform cesium-containing perovskite films with strong (110) preferred orientation by the CH3NH2 gas healing process. With this method, at most 10% nonpolar Cs cations could fully dope into the crystal lattice and extremely enhance the interaction of the inorganic framework with a more
symmetrical PbI6 octahedron, resulting in obvious improvement in moisture stability under continuous illumination.

ch3nh2_gas_induced_110_preferred_cesiumcontaining.pdf ch3.png
Bat-El Cohen, Małgorzata Wierzbowska, and Etgar Lioz. 2/3/2017. “High Efficiency and High Open Circuit Voltage in Quasi 2DPerovskite Based Solar Cells.” Advanced Functional Materials, 2017: 1604733.Abstract

An important property of hybrid layered perovskite is the possibility to reduce
its dimensionality to provide wider band gap and better stability. In this work,
2D perovskite of the structure (PEA)2(MA)n–1PbnBr3n+1 has been sensitized,
where PEA is phenyl ethyl-ammonium, MA is methyl-ammonium, and using
only bromide as the halide. The number of the perovskite layers has been
varied (n) from n = 1 through n = ∞. Optical and physical characterization
verify the layered structure and the increase in the band gap. The photovoltaic
performance shows higher open circuit voltage (Voc) for the quasi 2D perovskite
(i.e., n = 40, 50, 60) compared to the 3D perovskite. Voc of 1.3 V without
hole transport material (HTM) and Voc of 1.46 V using HTM have been
demonstrated, with corresponding efficiency of 6.3% and 8.5%, among the
highest reported. The lower mobility and transport in the quasi 2D perovskites
have been proved effective to gain high Voc with high efficiency, further
supported by ab initio calculations and charge extraction measurements. Bromide
is the only halide used in these quasi 2D perovskites, as mixing halides
have recently revealed instability of the perovskite structure. These quasi 2D
materials are promising candidates for use in optoelectronic applications that
simultaneously require high voltage and high efficiency.

high_efficiency_and_high_open_circuit_voltage.png hight_efficiency_and_hight.pdf
Daniel Amgar, Avigail Stern, Dvir Rotem, Danny Porath, and Etgar Lioz. 1/17/2017. “Tunable Length and Optical Properties of CsPbX3 (X = Cl, Br, I)Nanowires with a Few Unit Cells.” Nano Letters, 2017, 17: 1007−1013.Abstract

Perovskite nanostructures, both hybrid organo−metal
and fully inorganic perovskites, have gained a lot of interest in the past
few years for their intriguing optical properties in the visible region. We
report on inorganic cesium lead bromide (CsPbBr3) nanowires (NWs)
having quantum confined dimensions corresponding to 5 unit cells. The
addition of various hydrohalic acids (HX, X = Cl, Br, I) was found to
highly affect the NW length, composition, and optical properties.
Hydrochloric (HCl) and hydroiodic (HI) acids mixed in the reaction
solution influence the crystal structure and optical properties and
shorten the NWs, while the hydrobromic acid (HBr) addition results
solely in shorter NWs, without any structural change. The addition of HX increases the acidity of the reaction solution, resulting
in protonation of the oleylamine ligands from oleylamine into oleyl-ammonium cations that behave similarly to Cs+ during
crystallization. Therefore, the positions of the Cs+ at the growing surface of the NWs are taken by the oleyl-ammonium cations,
thus blocking further growth in the favored direction. The emission of the NWs is tunable between ∼423−505 nm and possesses
a potential in the optoelectronic field. Moreover, electrical conductivity measurements

tunable_length_and_optical_properties_of_few.png tunable_length_and_optical_properties_of_cspbx3.pdf
David P. Fenning, Mariana I. Bertoni, Yang Shao-Horn, Etgar Lioz, and Shany Gamliel. 2017. “Environmental sensors using metal halide perovskites.” United States of America Provisional application.
Etgar Lioz and Daniel Amgar. 2017. “Rubidium Lead Chloride Nanocrystals.” United States of America Provisional.
Etgar Lioz and Sigalit Aharon. 2017. “TWO DIMENSIONAL ORGANO-METAL HALIDE PEROVSKITENANORODS.” WIPO (World Intellectual Prop Org) WO 2017/153994 Al.
Hadas Naor, Yiftach Divon, Lior Iagher, Etgar Lioz, and David Avnir. 11/14/2016. “Conductive molecularly doped gold films.” J. Mater. Chem. C, 2016,4: 11548--11556.Abstract

We describe a general synthesis of conductive gold thin films doped with entrapped organic molecules,
and demonstrate, for the first time, the immobilization of a redox couple within an electrode in a single
step. The resulting film is of dual properties: conductivity arising from the gold, and redox behavior
originating from the entrapped molecule. Faster electron-transfer rates are found for the entrapped
case, compared to adsorption. The conductivity of the film affects the organic molecule–metal interactions,
as seen in resistivity measurements, in Raman spectroscopy of the metal-entrapped molecules and from
a remarkable red shift of 30 nm in emission spectroscopy. Doping is found to affect the work function
of gold. Thin conductive doped metal films are of relevance to a variety of applications such as
electrochemical detectors, electrode materials for electrochemical impedance spectroscopy, micro and
nano electronics interconnects for packaging and for printed circuit boards. The ability to fine-tune the
work function opens the possibility to design the desired energy level gaps for optoelectronic applications
such as light emitting diodes (LEDs), solar cells and transistors.

conductive_molecularly_doped_gold_films.pdf conductive_molecularly_doped_gold_films.png
Shany Gamliel, Inna Popov, Bat-El Cohen, Vladimir Uvarov, and Etgar Lioz. 11/2016. “Structural and Quantitative Investigation of Perovskite Pore Filling in Mesoporous Metal Oxides.” Crystals, 2016, 6: 149.Abstract

In recent years, hybrid organic–inorganic perovskite light absorbers have attracted much
attention in the field of solar cells due to their optoelectronic characteristics that enable high power
conversion efficiencies. Perovskite-based solar cells’ efficiency has increased dramatically from
3.8% to more than 20% in just a few years, making them a promising low-cost alternative for
photovoltaic applications. The deposition of perovskite into a mesoporous metal oxide is an
influential factor affecting solar cell performance. Full coverage and pore filling into the porous metal
oxide are important issues in the fabrication of highly-efficient mesoporous perovskite solar cells.
In this work, we carry out a structural and quantitative investigation of CH3NH3PbI3 pore filling
deposited via sequential two-step deposition into two different mesoporous metal oxides—TiO2
and Al2O3. We avoid using a hole conductor in the perovskite solar cells studied in this work to
eliminate undesirable end results. Filling oxide pores with perovskite was characterized by Energy
Dispersive X-ray Spectroscopy (EDS) in Transmission Electron Microscopy (TEM) on cross-sectional
focused ion beam (FIB) lamellae. Complete pore filling of CH3NH3PbI3 perovskite into the metal
oxide pores was observed down to X-depth, showing the presence of Pb and I inside the pores.
The observations reported in this work are particularly important for mesoporous Al2O3 perovskite
solar cells, as pore filling is essential for the operation of this solar cell structure. This work presents
structural and quantitative proof of complete pore filling into mesoporous perovskite-based solar
cells, substantiating their high power conversion efficiency.

structural_and_quantitative_investigation_of.png structural_and_quantitative_investigation_of.pdf