Michael Saliba

Michael Saliba
Universität Stuttgart · Institute for Photovoltaik

DPhil (oxon)

About

191
Publications
136,043
Reads
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30,836
Citations
Introduction
Michael Saliba (@miliba01) is a professor and the director of the Institute for Photovoltaics at Stuttgart University (ipv) with a dual appointment at the Research Center Julich. His research (@SalibaLab) focuses on a deeper understanding of novel semiconductor materials such as perovskites. He received the Heinz-Maier-Leibnitz Award of the DFG, and the MIT Technology Review named him one of the World's "35 Innovators Under 35". He was awarded an ERC Starting Grant in 2021.
Additional affiliations
June 2020 - present
Universität Stuttgart
Position
  • Managing Director
August 2019 - present
Forschungszentrum Jülich
Position
  • Helmholtz Young Investigator
April 2019 - May 2020
Technische Universität Darmstadt
Position
  • Professor

Publications

Publications (191)
Article
All of the cations currently used in perovskite solar cells (PSCs) abide by the tolerance factor for incorporation into the lattice. We show that the small and oxidation-stable Rb(+) can be embedded into a "cation cascade" to create perovskite materials with excellent material properties. We achieved stabilized efficiencies of up to 21.6% (average...
Article
Today's best perovskite solar cells use a mixture of formamidinium and methylammonium as the monovalent cations. With the addition of the inorganic cesium, the resulting triple cation perovskite compositions are thermally more stable, contain less phase impurities and are less sensitive to processing conditions. This enables more reproducible devic...
Article
Solution-processable perovskite solar cells have recently achieved certified power conversion efficiencies of over 20%, challenging the long-standing perception that high efficiencies must come at high costs. One major bottleneck for increasing the efficiency even further is the lack of suitable hole-transporting materials, which extract positive c...
Article
Full-text available
A new strategy for structuring organic?inorganic perovskite materials for optoelectronic applications was studied. By conformally evaporating perovskite onto a nanoimprinted polymer resist, we were able to create a working perovskite distributed feedback (DFB) cavity and to tune the emission between 770 and 793 nm simply by varying the grating peri...
Article
Organic–inorganic hybrid halide perovskites are widely considered to be one the most promising material in photovoltaic technology, the use of this semiconductor as absorbent layer in solar cells has attracted considerable interest due to their excellent properties. It has been reported that the incorporation of potassium ion is a powerful strategy...
Article
Full-text available
Chemically processed methylammonium tin-triiodide (CH3NH3SnI3) films include Sn in different oxidation states, leading to poor stability and low power conversion efficiency of the resulting solar cells (PSCs). The development of absorbers with Sn [2+] only has been identified as one of the critical steps to develop all Sn-based devices. Here, we re...
Article
Perovskite solar cells (PSCs) have shown rapid progress in a decade of extensive research and development, aiming now towards commercialization. However, the development of more facile, reliable, and reproducible manufacturing techniques will be essential for industrial production. Many lamination methods have been initially designed for organic ph...
Article
Full-text available
Photostability is critical for long-term solar cell operation. While light-triggered defects are usually reported as evidence of material degradation, we reveal that the formation of certain defects in metal halide perovskites is crucial for protection against intense or prolonged light exposure. We identify an inherent self-regulating cycle of for...
Article
Full-text available
Over the past few years, lead-halide perovskites (LHPs), both in the form of bulk thin films and colloidal nanocrystals (NCs), have revolutionized the field of optoelectronics, emerging at the forefront of next-generation optoelectronics. The power conversion efficiency (PCE) of halide perovskite solar cells has increased from 3.8% to over 25.7% ov...
Article
Due to the excellent optoelectronic properties, organic–inorganic perovskites have drawn much attention and have been applied in different electronics with remarkable performance. However, the poor stability creates a massive barrier for the commercialization of perovskite electronic devices. In this review, we discuss intrinsic and extrinsic facto...
Article
Full-text available
All‐inorganic perovskites have emerged as promising photovoltaic materials due to their superior thermal stability compared to their heat‐sensitive hybrid organic–inorganic counterparts. In particular, CsPbI2Br shows the highest potential for developing thermally‐stable perovskite solar cells (PSCs) among all‐inorganic compositions. However, contro...
Article
Full-text available
Long‐life of perovskite devices in working conditions remains as the bottle‐neck for technology application. Stable charge carriers’ transport together with non‐reactive contact materials contribute to the increase of the device operation time. Still an appropriate model for transport carrier mechanisms is needed because of the complex ionic‐electr...
Article
Interfaces between hybrid perovskite absorber and its adjacent charge transporting layers are of high importance for solar cells performance. Understanding their chemical and electronic properties is a key step in designing efficient and stable perovskite solar cells. In this work, we used tapered cross section photoemission spectroscopy (TCS‐PES)...
Article
Full-text available
Organic-inorganic hybrid halide perovskite materials have attracted considerable research interest, especially for photovoltaics. In addition, their scope has been extended towards light-emitting devices, photodetectors, or detectors. However, the toxicity of lead (Pb) element in perovskite compositions limits their applications. Therefore, a treme...
Chapter
Perovskite solar cells (PSCs) have been extensively developed over the past decade, providing sustainable solutions to present energy demands. Furthermore, they have obtained high power conversion efficiencies (PCEs) with a high solar light harvest through narrow bandgaps. The novel perovskite materials frequently exhibit unexpected and beneficial...
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
The outstanding properties of perovskites have brought them to the forefront of the emerging new materials in photovoltaics, approaching rapidly the performances of established silicon with the potential to revolutionise...
Article
Predicting the performance of solar cells though analytical models is important for the theory-guided optimization of these devices. Earlier models neglect the impact of the optical generation in the quasi-neutral regions of a perovskite solar cell. Here, a new model is developed that takes optical generation in these regions into account. The mode...
Article
Nanostructured tin oxide (SnO2) is a very promising electron transport layer (ETL) for perovskite solar cells (PSCs) that allows low-temperature processing in the planar n–i–p architecture. However, minimizing current–voltage (J–V) hysteresis and optimizing charge extraction for PSCs in this architecture remains a challenge. In response to this, we...
Article
Metal halide perovskites are the first solution processed semiconductors that can compete in their functionality with conventional semiconductors, such as silicon. Over the past several years, perovskite semiconductors have reported breakthroughs in various optoelectronic devices, such as solar cells, photodetectors, light emitting and memory devic...
Article
Lead halide based perovskite semiconductors self-assemble with distinct organic cations in natural multi-quantum-well structures. The emerging electronic properties of these two-dimensional (2D) materials can be controlled by the combination of the halide content and choice of chromophore in the organic layer. Understanding the photophysics of the...
Article
Full-text available
The cost‐effective, robust, and efficient electrocatalysts for photoelectrochemical (PEC) water‐splitting has been extensively studied over the past decade to address a solution for the energy crisis. The interesting physicochemical properties of CuO have introduced this promising photocathodic material among the few photocatalysts with a narrow ba...
Article
Full-text available
A study of the chemical and electronic properties of various layers across perovskite solar cell (PSC) stacks is challenging. Depth-profiling photoemission spectroscopy can be used to study the surface, interface, and bulk properties of different layers in PSCs, which influence the overall performance of these devices. In this study, we use sputter...
Article
In the last decade, the power conversion efficiency (PCE) of solution-processed perovskite solar cells (PSCs) in the lab-scale has reached an incredible level of 25.5%. Generally, PSCs are composed of a stack consisting of a perovskite thin-film sandwiched between an electron transporting layer (ETL) and a hole transporting layer (HTL). Although th...
Article
Full-text available
Measurement and understanding of electrochemical impedance spectra of perovskite solar cells (PSCs) are non‐trivial, as perovskite absorbers are a mixed conductor exhibiting both ionic and electronic motion. Moreover, the interpretation of the low‐frequency spectra especially low‐frequency resistance (RLF) is ambiguous. Some reports suggest that RL...
Article
Full-text available
Tin halide perovskites attract incremental attention to deliver lead‐free perovskite solar cells. Nevertheless, disordered crystal growth and low defect formation energy, related to Sn(II) oxidation to Sn(IV), limit the efficiency and stability of solar cells. Engineering the processing from perovskite precursor solution preparation to film crystal...
Article
Full-text available
Passivation and interlayer engineering are important approaches to increase the efficiency and stability of perovskite solar cells. Thin insulating dielectric films at the interface between the perovskite and the charge carrier transport layers have been suggested to passivate surface defects. Here, we analyze the effect of depositing poly(methyl m...
Article
The library of two-dimensional (2D) materials has been enriched over recent years with novel crystal architectures endowed with diverse exciting functionalities. Bulk perovskites, including metal-halide and oxide systems, provide access to a myriad of properties through molecular engineering. Their tunable electronic structure offers remarkable fea...
Article
MIT and KRICT scientists recently reported the highest certified power conversion efficiency of 25.2% for perovskite solar cells. They highlighted that charge carrier management is essential to improve the photovoltaic parameters and overcome the theoretical efficiency limit.
Article
MIT and KRICT scientists recently reported the highest certified power conversion efficiency of 25.2% for perovskite solar cells. They highlighted that charge carrier management is essential to improve the photovoltaic parameters and overcome the theoretical efficiency limit.
Article
Full-text available
Perovskite solar cells (PSCs) have been introduced as an attractive photovoltaic technology over the past decade due to low-cost processing, earth-abundant raw materials and high power conversion efficiencies (PCE) of up to 25.2%. However, the relatively high density of defects within the bulk, grain boundaries and surface of polycrystalline perovs...
Article
Full-text available
Lead‐halide perovskites (LHPs), in the form of both colloidal nanocrystals (NCs) and thin films, have emerged over the past decade as leading candidates for next‐generation, efficient light‐emitting diodes (LEDs) and solar cells. Owing to their high photoluminescence quantum yields (PLQYs), LHPs efficiently convert injected charge‐carriers to light...
Article
Full-text available
Lead‐halide perovskites (LHPs), in the form of both colloidal nanocrystals (NCs) and thin films, have emerged over the past decade as leading candidates for next‐generation, efficient light‐emitting diodes (LEDs) and solar cells. Owing to their high photoluminescence quantum yields (PLQYs), LHPs efficiently convert injected charge‐carriers to light...
Article
Full-text available
Understanding and controlling the crystallization of organic-inorganic perovskite materials is important for their function in optoelectronic applications. This control is particularly delicate in scalable single-step thermal annealing methods. In this work, the crystallization mechanisms of flash infrared-annealed perovskite films, grown on substr...
Article
Publication record and technical expertise are essential but they are not the only aspects you need to work on to become competitive for permanent positions in academia. Michael Saliba discusses how actively looking for different experiences to develop his versatility has been vital for his career progress.
Article
Full-text available
Wide band-gap perovskite solar cells have the potential for a relatively high output voltage and resilience in a degradation-inducing environment. Investigating the reasons why high voltages with adequate output power have not been realized yet is an underexplored part in perovskite research although it is of paramount interest for multijunction so...
Article
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The rapid development of Internet of Things mobile terminals has accelerated the market's demand for portable mobile power supplies and flexible wearable devices. Here, an embedded metal‐mesh transparent conductive electrode (TCE) is prepared on poly(ethylene terephthalate) (PET) using a novel selective electrodeposition process combined with inver...
Article
Negative capacitance at the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, where the origin is still under discussion. Here we use Impedance Spectroscopy to analyse these responses in methylammonium lead bromide cells treated with lithium cation at the electron selective layer/perovskite interface and...
Article
Full-text available
Perovskite solar cells (PSCs) have emerged recently as promising candidates for next generation photovoltaics and have reached power conversion efficiencies of 25.2%. Among the various methods to advance solar cell technologies, the implementation of nanoparticles with plasmonic effects is an alternative way for photon and charge carrier management...
Article
Online conferences are increasingly popular within scientific communities due to the travel restrictions faced by many countries. Although a relatively new phenomenon for many of us, lessons from recent meetings provide useful reflections on the format’s opportunities and challenges compared to conventional in-person meetings.
Preprint
Full-text available
Negative capacitance at low frequency domain and inverted hysteresis are familiar features in perovskite solar cells, which origin is still under discussion. Here we use Impedance Spectroscopy to analyse the evolution of these features in methylammonium lead bromide cells (MAPbBr3) treated with extrinsic cations at the cathode/perovskite interface...
Article
Full-text available
Low toxicity and an ideal energy bandgap make 2D Ruddlesden-Popper tin-based halide perovskites a promising photovoltaic material. However, the disordered crystal orientation and the oxidation of Sn2+ to Sn4+ at the surface still need to be addressed. Here, we demonstrate that the annealing of FASnI3 assisted by phenyl ethyl ammonium chloride enabl...
Article
Full-text available
Metal halide perovskites have emerged as exceptional semiconductors for optoelectronic applications. Substitution of the monovalent cations has advanced luminescence yields and device efficiencies. Here, we control the cation alloying to enhance optoelectronic performance through alteration of the charge carrier dynamics in mixed-halide perovskites...
Article
Flash infrared annealing (FIRA) of perovskite films enables manufacturing compact perovskite layers for photovoltaic devices. Here, a variable infrared pulse length to control crystal nucleation and growth in perovskite films is investigated. By varying the FIRA parameters, high-quality films are fabricated of fully inorganic and hybrid perovskites...
Article
Full-text available
Improving the long-term stability of perovskite solar cells is critical to the deployment of this technology. Despite the great emphasis laid on stability-related investigations, publications lack consistency in experimental procedures and parameters reported. It is therefore challenging to reproduce and compare results and thereby develop a deep u...
Article
Full-text available
This work unveils how to quickly manufacture highly efficient and stable perovskite solar cells (PSCs) using the Flash InfraRed Annealing (FIRA) method. With FIRA, the titanium oxide mesoscopic layer can be synthesized in only 10 min, and the synthesis of the perovskite film takes a few seconds. All is done in one place and continuously, allowing a...
Chapter
Perovskite solar cells (PSCs) have rapidly emerged as a potential competitive photovoltaic technology reaching high power conversion efficiencies (PCEs) from single digits to a certified 23.7% in just a few years. At this stage, the key issues are the further improvement of the PCE and long-term device stability. In this chapter, we summarize the r...