Emilio J. Juarez-Perez

Emilio J. Juarez-Perez
University of Zaragoza | UNIZAR · Instituto de Nanociencia y Materiales de Aragón (INMA) CSIC-Universidad de Zaragoza

PhD Chemistry

About

107
Publications
51,957
Reads
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7,215
Citations
Introduction
www.emiliojuarez.es Chemical Engineer (Universidad de Granada, 1998-2003 including final research project at University College of London, 2003-04), FPU fellow, Outstanding Award PhD in Chemistry (Universidad Autónoma de Barcelona, ICMAB-CSIC, 2009), KAKENHI Young Principal Investigator from the Japan Society for the Promotion of Science (2017) and currently holding an ARAID researcher position since mid-2019. I consider myself a versatile scientist with a multidisciplinary background in Materia
Skills and Expertise
Additional affiliations
September 2018 - April 2019
September 2015 - August 2018
Okinawa Institute of Science and Technology
Position
  • PostDoc Position
March 2013 - August 2015
Universitat Jaume I
Position
  • Research Assistant
Education
September 2003 - June 2004
University College London
Field of study
  • Chemical Engineering
September 1998 - June 2003
University of Granada
Field of study
  • Chemical Engineering

Publications

Publications (107)
Article
Full-text available
Pyrolysis of formamidinium halide salts (FAI, FABr) results in a new type of amorphous carbon nitride materials with a mass fraction of 40–50% nitrogen content. Pyrolysis temperature drives final chemical composition, morphology, optical and electrical properties of the material independently of the halide precursor and identifying triazine ring, i...
Article
Full-text available
Time-correlated single photon counting has been conducted to gain further insights into the short photoluminescence lifetimes (nanosecond) of lead iodide perovskite (MAPbI3) thin films (∼100 nm). We analyze three different morphologies, compact layer, isolated island, and connected large grain films, from 14 to 300 K using a laser excitation power...
Article
Full-text available
Large datasets are now ubiquitous as technology enables higher-throughput experiments, but rarely can a research field truly benefit from the research data generated due to inconsistent formatting, undocumented storage or improper dissemination. Here we extract all the meaningful device data from peer-reviewed papers on metal-halide perovskite sola...
Article
Full-text available
Nanomaterials undergoing cyclic swelling-deswelling benefit from inner void spaces that help accommodate significant volumetric changes. Such flexibility, however, typically comes at a price of reduced mechanical stability, which leads to component deterioration and, eventually, failure. Here, we identify an optimised building block for silicon-bas...
Article
ABX3 compounds with perovskite structure have been intensively and extensively studied in the last decades in view of their structural richness and amazing variety of interesting properties, such as piezoelectricity, ferroelectricity, ferromagnetism, superconductivity, magnetoresistance, multiferroicity, etc. In this chapter, we recompile well-esta...
Article
In this paper, the physical mechanisms responsible for optical gain in CH3NH3PbI3 (MAPI) polycrystalline thin films are investigated experimentally and theoretically. Waveguide structures composed by a MAPI film embedded in between PMMA and silica layers are used as an efficient geometry to confine emitted light in MAPI films and minimize the energ...
Article
A new encapsulation technique helps move a photovoltaic toward commercialization
Article
The effect of ion migration from indium tin oxide (ITO) and SiO2 substrates on the photo and thermal degradation of CH3NH3SnI3 hybrid perovskite is studied. The measurements of X-ray photoelectron survey spectra (XPS) showed an increase in the concentration of substrate ions in the surface layer of ITO/CH3NH3SnI3 and reduction of N:Sn and I:Sn rati...
Article
Dynamic disorders, which possess a finite charge delocalization, play a critical role in the charge transport properties of high-mobility molecular organic semiconductors. The use of two-dimensional (2D) charge transport in crystalline organic semiconductors can effectively facilitate reducing the sensitivity of charge carriers to thermal energetic...
Article
Photonic applications based on halide perovskites, namely CH3NH3PbI3 (MAPbI3), have recently attracted remarkable attention due to the high efficiencies reported for photovoltaic and light emitting devices. Despite these outstanding results, there are many temperature-, laser excitation power-, and morphology-dependent phenomena that require furthe...
Article
Last field year, of perovskite two important solar cells milestones that would were bring reached us closer in the to imminent commercial use of this light-harvester material. One was the first perovskite-based building integrated photovoltaic (BIPV) product demonstration by Saule Technologies.1 Another significant landmark was a new certified worl...
Article
Full-text available
Carbon electrode-based perovskite solar cells (PSCs) with low cost and long-term stability have been recognized as a competitive candidate towards future practical applications. However, energy level mismatch and ineffective hole extraction at the carbon electrode/perovskite interface limit device performance. Herein, we develop a low cost carbon-b...
Article
We have been able to prepare two new lead halides with formula DMAPbX3 (where DMA is dimethylammonium and X is Cl- or Br-), which display a 4H-hexagonal perovskite polytype, an unusual crystal structure in hybrid organic-inorganic perovskites. Both compounds experience a first order phase transition, the chloride at ≈320 K and the bromide at ≈250 K...
Article
Full-text available
In recent years, the major factors that determine commercialization of perovskite photovoltaic technology have been shifting from solar cell performance to stability, reproducibility, device upscaling and the prevention of lead (Pb) leakage from the module over the device service life. Here we simulate a realistic scenario in which perovskite modul...
Article
The thermal stability and decomposition products of formamidinium, a widely used organic cation in perovskite solar cells formulation, were investigated. Thermal degradation experiments of formamidinium-based perovskite and their halide precursors were carried out in helium and vacuum atmosphere at a constant heating rate (20 ºC/min). In addition,...
Article
Carrier diffusion length and lifetime parameters for electron transport at nanoscale semiconductor slabs have been fitted using a 1D model and the decay data extracted from transient photoemission electron microscopy. Meanwhile, a conventional photoluminescence quenching measurement needs two separate samples with an active material between blockin...
Preprint
Full-text available
An article in Sustainable Energy & Fuels authored by Song et al. reported time-resolved mass spectrometry (MS) of evolved gas species during photo-induced degradation of methylammonium lead iodide perovskite (MAPbI3 ). The composition of volatile species observed in this work for MAPbI3 is significantly different than that in an early work by Juare...
Article
The correct identification of all gases released during hybrid perovskite degradation is of great significance to develop strategies to extend the lifespan of any device based on this semiconductor. CH3X (X=Br/I) is a released degradation gas/low boiling point liquid arising from methylammonium (MA+) based perovskites which has been largely overloo...
Article
Full-text available
An upscalable perovskite film deposition method combining raster ultrasonic spray coating and chemical vapor deposition is reported. This method overcomes the coating size limitation of the existing stationary spray, single‐pass spray, and spin‐coating methods. In contrast with the spin‐coating method (>90% Pb waste), negligible Pb waste during PbI...
Article
Lead halide (APbX3) perovskites, in polycrystalline thin films but also perovskite nanoparticles (NPs) has demonstrated excellent performance to implement a new generation of photovoltaic and photonic devices. The structural characterization of APbX3 thin films using (scanning) transmission electron microscopy ((S)TEM) techniques can provide valuab...
Preprint
Full-text available
An article in Sustainable Energy & Fuels authored by Song et al. 1 reported time-resolved mass spectrometry (MS) of evolved gas species during photo-induced degradation of methylammonium lead iodide perovskite (MAPbI3). The composition of volatile species observed in this work for MAPbI3 is significantly different than that in an early work by Juar...
Preprint
Full-text available
div>This is a comment on an article in Sustainable Energy & Fuels reporting time-resolved mass spectrometry (MS) of evolved gas species during photo-induced degradation of methylammonium lead iodide perovskite (MAPbI3 ). Note: The authors of the commented article released a response to these observations on February 1, 2019. This document has bee...
Article
Full-text available
Besides high efficiency, the stability and reproducibility of perovskite solar cells (PSCs) are also key for their commercialization. Herein, we report a simple perovskite formation method to fabricate perovskite films with thickness over 1 μm in ambient condition on the basis of the fast gas-solid reaction of chlorine-incorporated hydrogen lead tr...
Article
Full-text available
Accurate and fast assessment of the intrinsic instability of mixed composition hybrid halide perovskite material is of vital importance for the development of perovskite solar cells. A longer lifetime close to current silicon‐based technology is a mandatory property for perovskite solar cells to reach commercial applications. The conventional metho...
Article
2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-MeOTAD) has been widely employed as a hole transport layer (HTL) in perovskite-based solar cells. Despite high efficiencies, issues have been reported regarding solution processed spiro-MeOTAD HTL such as pinholes and the strong dependence of electrical properties upon air...
Article
A simple and inexpensive technique to synthesize and deposit Cu(II) oxide (CuO) nanostructured layers is reported herein together with electrical and optical properties characterization. The 2-step deposition procedure consists of spin-coating a Cu(II) formate solution on fluorine-doped tin oxide (FTO) conducting glass substrate followed by a heat...
Article
Full-text available
Hybrid lead halide perovskites have emerged as promising active materials for photovoltaic cells. Despite superb efficiencies achieved, it has been widely recognized that long-term stability is a key challenge intimately determining the future development of perovskite based photovoltaic technology. Here, we present reversible and irreversible phot...
Article
In organic field-effect transistors, the first few molecular layers at the semiconductor/dielectric interface are regarded as the active channel for charge transport, thus great efforts have been devoted to the modification/optimization of molecular packing at such interfaces. Here, we report the organic monolayers with large-area uniformity and hi...
Article
Full-text available
Mixed cation hybrid perovskites such as CsxFA1−xPbI3 are promising materials for solar cell applications, due to their excellent photoelectronic properties and improved stability. Although power conversion efficiencies (PCEs) as high as 18.16% have been reported, devices are mostly processed by the anti-solvent method, which is difficult for furthe...
Article
Full-text available
Cs-substituted mixed cation hybrid perovskites are promising materials for solar cell applications. In article number 1703835, Yabing Qi and co-workers report a scalable fabrication method (HCVD-CE) combining hybrid chemical vapor deposition and cation exchange to prepare Cs-substituted mixed cation perovskite solar cells. Devices prepared by this...
Article
Full-text available
Because of the rapid rise of the efficiency, perovskite solar cells are currently considered as the most promising next-generation photovoltaic technology. Much effort has been made to improve the efficiency and stability of perovskite solar cells. Here, it is demonstrated that the addition of a novel organic cation of 2-(6-bromo-1,3-dioxo-1H-benzo...
Book
Full-text available
Hybrid organic-inorganic perovskite solar cells emerged in the early 2010s producing a major revolution within scientific research in photovoltaics. This book summarizes the birth and initial development in this field. It provides narrative accounts of perovskite solar cells evolution and impact on general science as well as a classification of mos...
Article
Full-text available
The environmental performance of four different device assembly procedures based on hybrid halide perovskite solar cell (PSC) were assessed from cradle to grave using life cycle assessment (LCA) methodology. In addition, a new environmental indicator was defined to measure the time evolution of an impact category, specifically in this case, human t...
Article
Full-text available
Organic-inorganic halide perovskite materials (e.g. MAPbI3, FAPbI3, etc; where MA = CH3NH3+; FA = CH(NH2)2+) have been studied intensively for photovoltaic applications. Major concerns for the commercialization of perovskite photovoltaic technology to take off include lead toxicity, long-term stability, hysteresis, and optimal bandgap. Therefore, t...
Article
Full-text available
Organo-lead-halide perovskites are promising materials for optoelectronic applications. Perovskite solar cells have reached power conversion efficiencies over 22% and perovskite light emitting diodes have recently achieved over 11% external quantum efficiency. To date, most research on perovskite light emitting diodes has focused on solution proces...
Article
Two novel styrene-containing meta-carborane derivatives substituted at the second carbon cluster atom (Cc) with either a methyl (Me) or a phenyl (Ph) group are introduced herein along with a new set of stilbene-containing ortho- (o-) and meta- (m-) carborane dyads. The latter set of compounds have been prepared from styrene-containing carborane der...
Article
Full-text available
Efficiencies of organic–inorganic lead halide perovskite solar cells (PSCs) have significantly increased in recent years, but instability issues impede their further development and application. Previous studies reported that volatile species (for example, iodine, I2) were generated when perovskites were subjected to moisture, oxygen, light illumin...
Chapter
Full-text available
Hybrid Halide Perovskites (HPVK) are novel materials that have attracted attention in the last few years as promising materials in the photovoltaic field,[1, 2] as efficiencies higher than 20% have been reported[3].The HPVK can have different compositions, which allows the control of lattice parameters[4] and bandgap values in the visible to near i...
Article
Full-text available
An organo-metal halide perovskite is a promising material for solar cell applications, but the polycrystalline nature of perovskites can cause thin films to be non-uniform with disconnected grains. These grain boundaries make the perovskite film vulnerable to the local chemical environment, or allow unwanted direct contact of the electron transport...
Article
Full-text available
Thermal gravimetric and differential thermal analysis (TG-DTA) coupled with quadrupole mass spectrometry (MS) instrumentation and first principles calculations were employed to elucidate the chemical nature of released gases during the thermal decomposition of CH3NH3PbI3. Contrarily to the common wisdom that CH3NH3PbI3 is decomposed into CH3NH2 and...
Article
Full-text available
An organo-metal halide perovskite is a promising material for solar cell applications, but the polycrystalline nature of perovskites can cause thin films to be non-uniform with disconnected grains. These grain boundaries make the perovskite film vulnerable to the local chemical environment, or allow unwanted direct contact of the electron transport...
Article
The use of a solid hole transport layer (HTL) was transformational for the recent perovskite solar cell (PSC) revolution in solar energy technology. Often high efficiency PSC devices employ heavily doped hole transport materials such as spiro -­‐MeOTAD. Independent of HTL chemistry, lithium-­‐bis-­‐trifluoromethanesulfonyl-­‐imide (LiTFSI) and tert...
Article
Full-text available
Semiconductor organometallic halide perovskites (CH 3 NH 3 PbX 3 , X=Cl, Br, I) (HPVK) have emerged as a new promising material able to improve the optoelectronic technology performance. Although this material has mostly been applied to improve the efficiency of photovoltaic devices, it also shows amazing properties for photonic applications. In pa...
Article
In addition to the known effect of the substrate on the interfacial properties of perovskite films, here we show that the bulk properties of hybrid lead halide perovskite films depend on the type of substrate used for film growth. Despite the relative large film thickness, ∼600 nm, the roughness and nature of the substrate layer (glass, FTO, TiO2 a...
Article
Full-text available
Intense research on the electron transport material (ETM) has been pursued to improve the efficiency of perovskite solar cells (PSCs) and decrease their cost. More important, the role of the ETM layer is not fully understood, and research on new device architectures is still needed. Here, we report the use of three-dimensional (3D) TiO2 with hierar...