1,721,087 research outputs found
A molecular sieve boosts perovskite stability
Full text linkHighly efficient and stable perovskite solar cells are fabricated by introducing a molecular sieve which finely controls the 2D/3D heterointerface reactions
Sustainable decommissioning of perovskite solar cells: from waste to resources
No full text: Perovskite solar cells (PSCs) have witnessed a rapid progression as emerging alternatives for innovative photovoltaics (PVs). However, this promising growth also comes with challenges related to the end-of-life (EoL) management of exhausted devices. In this review, we discuss different studies on the implications of the decommissioning of PSCs from a sustainable perspective by reviewing current PSC recycling strategies as general guidelines in the field of EoL PSCs. We hope that this review would encourage the necessary development of more virtuous energy-efficient and environmentally friendly recycling protocols for PSC recovery, from lab- to large-scale application in view of perovskite-based PV technology's imminent jump to the market
Smart Materials to Empowering Perovskite Solar Cells with Self‐Healing Capability
No full textInspired by nature, intelligent self-healing materials have recently been exploited also in the field of photovoltaics to mimic natural systems achieving self-repairing. The past decade has witnessed perovskite solar cells (PSCs) skyrocketing to a certified power conversion efficiency of 26.1%. However, their intrinsic instability, when exposing to moisture, high temperature, and continuous illumination, hampers their commercial development for a long-term use in ambient operating conditions. Therefore, the use of smart self-healing materials, based on self-assembling properties and dynamic interactions, empowers PSCs with self-recovery abilities to reinforce their pivotal role as efficient photovoltaic devices and encourage their exploitation in the market. Herein, the current progress in self-healing perovskite materials with a special focus on self-recovery after moisture exposure or mechanical damage with the aim to provide a valuable insight for research on this topic to accelerate the PSC commercialization process is highlighted
Pump-probe spectroscopy in organic semiconductors: monitoring fundamental processes of relevance in optoelectronics
No full textPump-probe spectroscopy in organic semiconductors: monitoring fundamental processes of relevance in optoelectronic
Molecular cation and low-dimensional perovskite surface passivation in perovskite solar cells
No full textThe deposition of large ammonium cations onto perovskite surfaces to passivate defects and reduce contact recombination has enabled exceptional efficiency and stability in perovskite solar cells. These ammonium cations can either assemble as a thin molecular layer at the perovskite surface or induce the formation of a low-dimensional (usually two-dimensional) perovskite capping layer on top of the three-dimensional perovskite. The formation of these two different structures is often overlooked by researchers, although they impact differently on device operation. In this Review, we seek to distinguish between these two passivation layers. We consider the conditions needed for the formation of low-dimensional perovskite and the electronic properties of the two structures. We discuss the mechanisms by which each method improves photovoltaic efficiency and stability. Finally, we summarize the knowledge gaps that need to be addressed to better understand and optimize ammonium cation-based passivation strategies
Fiber-format stimulated-Raman-scattering microscopy from a single laser oscillator
No full textA highly simplified architecture for stimulated-Raman-scattering microscopy is demonstrated, where multiple
tunable narrowband picosecond pulses are generated by spectral compression of femtosecond pulses
emitted by a single compact Er-fiber oscillator. The system provides high sensitivity 2*10^−7 and spectral
resolution sub-15 cm−1, and it offers an unprecedented flexibility for multicolor imaging
Vibrational Response of Methylammonium Lead Iodide: From Cation Dynamics to Phonon–Phonon Interactions
No full textThe dynamic evolution of the vibrational interactions in the prototypical CH3NH3PbI3 was studied through a comprehensive experimental and theoretical investigation with a focus on the interactions between the organic cations and the inorganic cage. To date, no clear picture has emerged on the critical and fundamental interactions between the two perovskite components, despite the relevance of phonons to the electronic properties of several classes of perovskites. For the first time, we have monitored the IR and nonresonant Raman response in the broad frequency range 30–3400 cm−1 and in the temperature interval 80–360 K. Strong changes in the energies of different vibrational modes with temperature are observed and examined in the framework of phonon–phonon interactions considering a significant anharmonic contribution to the phonon relaxation process. The vibrational relaxation of the bending modes and their reorientation activation energies identify that such mechanisms are governed by medium-to-strong hydrogen bonds in the orthorhombic phase; however, any ferroelectric ordering in the orthorhombic phase is governed mostly by dipole interactions. These changes imply that charge localization mechanisms play a primary role, and our study enriches the fundamental knowledge of phonon interactions and charge transport in CH3NH3PbI3 for the further development of optoelectronic applications
Influence of Blend Composition on Ultrafast Charge Generation and Recombination Dynamics in Low Band Gap Polymer-Based Organic Photovoltaics
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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