A5053654587- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Perovskite Materials and Applications
- Semiconductor materials and interfaces
- Solid-state spectroscopy and crystallography
- Electron and X-Ray Spectroscopy Techniques
- Optical properties and cooling technologies in crystalline materials
- Conducting polymers and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Phase-change materials and chalcogenides
- Silicon and Solar Cell Technologies
- Electronic and Structural Properties of Oxides
- Crystallization and Solubility Studies
- Machine Learning in Materials Science
- ZnO doping and properties
- Thin-Film Transistor Technologies
- Advanced Semiconductor Detectors and Materials
- Spectroscopy and Laser Applications
- TiO2 Photocatalysis and Solar Cells
- Calibration and Measurement Techniques
- Pigment Synthesis and Properties
- Organic Electronics and Photovoltaics
- solar cell performance optimization
- Advanced X-ray Imaging Techniques
Universidad Pablo de Olavide
2022-2025
Martin Luther University Halle-Wittenberg
2014-2024
Institut de Recerca en Energia de Catalunya
2015-2020
Helmholtz-Zentrum Berlin für Materialien und Energie
2009-2016
Universitat de Barcelona
2016
German Orient Foundation
2008
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2005-2006
Instituto de Engenharia de Sistemas e Computadores Microsistemas e Nanotecnologias
2006
A large improvement in Cu2ZnSnSe4 solar cell efficiency is presented based on the introduction of a Ge superficial nanolayer. This explained by three complementary effects: formation liquid Ge-related phase, possible reduction Sn multicharge states, and GeOx nanoinclusions, which lead to an impressive (VOC) increase.
A fundamental analysis of the impact Ge on synthesis Cu<sub>2</sub>ZnSnSe<sub>4</sub>:Ge by a sequential process is presented, reporting consequences absorber morphology and solar cell devices performance.
While perovskite-based photovoltaics is progressing toward commercialization, it remains an open question which fabrication technology – solution-based, vapor-based, or combinations will pave the way to faster economic breakthrough.
Abstract Attempts to improve the efficiency of kesterite solar cells by changing intrinsic stoichiometry have not helped boost device beyond current record 12.6%. In this light, addition extrinsic elements Cu 2 ZnSn(S,Se) 4 matrix in various quantities has emerged as a popular topic aiming ameliorate electronic properties cell absorbers. This article reviews doping and alloying concepts for absorbers with focus on those that do alter parent zinc-blende derived structure. The latest...
Abstract In recent years, there has been an impressively fast technological progress in the development of highly efficient lead halide perovskite solar cells. However, stability films and respective cells is still open point concern calls for advanced characterization methods. this work, we identify appropriate measurement conditions a meaningful analysis spin-coated absorber-grade thin based on methylammonium (MA) iodide (MAPbI 3 ) by Raman spectroscopy. The material under investigation...
The implementation of potassium fluoride treatments as a doping and surface modification procedure in chalcopyrite absorber preparation has recently gained much interest since it led to new record efficiencies for this kind solar cells. In the present work, Cu(In,Ga)Se2 absorbers have been evaporated on alkali containing Mo/soda-lime glass substrates. We report compositional electronic changes result post deposition treatment with KF (KF PDT). particular, by comparing standard X-ray...
We present the growth, phase transitions, and thermal decomposition of CsPbX3 (X = I, Br) thin films monitored by in situ X-ray diffraction (XRD). The perovskite are prepared vacuum via co-evaporation PbX2 CsX onto glass substrates. In allows observation transitions while samples heated with a linear temperature ramp. Our experiments reveal route for perovskites high vacuum, much higher stability than their hybrid organic–inorganic MAPbX3 counterparts. also observe response black CsPbI3 film...
Perovskite solar cells based on (CH3NH3)Pb(I,Cl)3 have recently demonstrated rapidly increasing cell efficiencies. Here, we show progress identifying phases present during the growth of perovskite thin films with vacuum-based coevaporation approach using two sources under varying deposition conditions. With in situ X-ray diffraction, crystalline can be identified and monitored real time. For different (CH3NH3)I-to-PbCl2 flux ratios, distinct (CH3NH3)Pb(IxCl(1-x))3 high (x > 0.95) lower <...
Semiconducting indium sulfide (In2S3) has recently attracted considerable attention as a buffer material in the field of thin film photovoltaics. Compared with this growing interest, however, detailed characterizations crystal structure are rather scarce and controversial. In order to close gap, we have carried out reinvestigation an situ X-ray diffraction study function temperature using monochromatic synchrotron radiation. For purpose study, high quality polycrystalline In2S3 nominally...
In our recently published work, the positive effect of a Ge nanolayer introduced into processing Cu2ZnSnSe4 absorbers (CZTSe) was demonstrated. this contribution, complete optimization new approach is presented for first time. Hence, optimum thickness range defined in order to achieve an improved performance devices, obtaining record efficiency 10.6%. By employing optimized approach, open-circuit voltage (VOC) boosted pure selenide CZTSe up 489 mV, leading VOC deficit among lowest reported...
The gap <italic>versus</italic><graphic xmlns:xlink="http://www.w3.org/1999/xlink" id="ugt1" xlink:href="http://pubs.rsc.org/TA/2019/c9ta01456j/c9ta01456j-t1..gif"/> of double perovskite p-type TCS candidates compared with other systems from the literature.
We present the identification of crystalline phases by <italic>in situ</italic> X-ray diffraction during growth and monitor phase evolution subsequent thermal treatment CH<sub>3</sub>NH<sub>3</sub>PbX<sub>3</sub> (X = I, Br, Cl) perovskite thin films.
ABSTRACT In 2 S 3 buffer layers have been prepared using the spray ion layer gas reaction deposition technique for chalcopyrite‐based thin‐film solar cells. These buffers deposited on commercially available Cu(In,Ga)(S,Se) absorbers resulted in cells with certified record efficiencies of 16.1%, clearly higher than corresponding CdS‐buffered references. The process has optimized, and resulting studied current–voltage quantum efficiency analysis compared previous cells, a thermally evaporated...
Abstract Ga segregation at the backside of Cu(In,Ga)Se 2 solar cell absorbers is a commonly observed phenomenon for large variety sequential fabrication processes. Here, we investigate correlation between Se incorporation, phase formation and during fast selenisation Cu–In–Ga precursor films in elemental selenium vapour. incorporation are analysed by real‐time synchrotron‐based X‐ray diffraction fluorescence analysis. Correlations depth distributions gained interrupting process several...
Here we present a detailed structural analysis of methylammonium lead halide (I, Cl) films by <italic>in situ</italic> X-ray diffraction during their growth and thermal recrystallization up to decomposition.
Fabrication on transparent soda-lime glass/fluorine-doped tin oxide (FTO) substrates opens the way to advanced applications for kesterite solar cells such as semitransparent, bifacial, and tandem devices, which are key future of PV market. However, complex behavior p-kesterite/n-FTO back-interface potentially limits power conversion efficiency devices. Overcoming this issue requires careful interface engineering. This work empirically explores use transition-metal oxides (TMOs) Mo-based...
Hybrid lead halide perovskite solar cells (PSCs) stand out in terms of their high efficiency, yet the limited stability and process scalability pose challenges to commercialization. Fully printable carbon-based (C-PSCs), consisting a triple stack mesoporous titania, zirconia, carbon layers impregnated with material, have been introduced as an attractive architecture; however, they generally exhibit lower efficiency. This study proposes viable scalable approach increase efficiency C-PSCs by...
Self-assembled monolayers (SAMs) are highly promising hole-transport layers for p-i-n perovskite solar cells, increasing photocurrent, reducing hysteresis and boosting photovoltage. However, the SAM's exact role in maintaining those benefits remains elusive. This work demonstrates that SAMs enhance open-circuit voltage (Voc) stability by suppressing surface recombination, as revealed impedance spectroscopy. is reflected time constants related to ionic dynamics, taking values from 10–2 10–1 s...
Improving the performance of dye‐sensitised solar cells (DSC) under artificial light sources and at low intensities requires preserving adequate electron transport properties in sensitised photoanode that are characteristic DSC operation 1 sun. Besides, parasitic resistance optical losses must be reduced. In this respect, impact chemical electrical transparent conducting oxide (TCO) has somehow been overlooked. Considering systematic reduction diffusion length as quasi‐Fermi level regime is...
Recently, beneficial effects of the incorporation small amounts Ge into Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ZnSnSe xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> (CZTSe)-based solar cells have been reported, showing that presence can enhance crystalline properties CZTSe, assisting grain growth, leading to high-efficiency devices. In this study, we prepare CZTSe layers by a sequential process consisting sputtering...
Lead-free, highly stable, inorganic double perovskites such as Cs2AgBiBr6 promise to solve two of the main issues that currently hold back wide-scale application perovskite-based opto-electronic devices: a lack stability and use toxic lead. Recently, has been shown be very promising material for in UV X-ray detectors. In this work, we analyze film formation thin films with time-resolved crystal structure analysis using situ diffraction (XRD). We present an all-vacuum process preparation via...
Abstract Cu 2 ZnSn(S 1−x Se x ) 4 solar cells are well suited for roll‐to‐roll mass production since they formed mainly by non‐toxic and earth‐abundant elements. Polyimide (PI) has proved to be a promising compatible substrate yielding very high efficiency devices Cu(In,Ga)Se . In this work, we demonstrate the feasibility of using PI as low‐weight flexible alternative soda‐lime glass ZnSnSe (CZTSe) cells. Two main concerns arise when working with PI. Firstly, its low thermal robustness...