scispace - formally typeset
Search or ask a question
Topic

Perovskite (structure)

About: Perovskite (structure) is a research topic. Over the lifetime, 51482 publications have been published within this topic receiving 1541750 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: A direct correlation is found between the density of traps, thedensity of mobile ionic defects, and the degree of hysteresis observed in the current–voltage (J–V) characteristics of perovskite solar cells.
Abstract: Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite solar cells (PSCs) and limits their efficiency. We investigate the attributes of the primary trap-assisted recombination channels (grain boundaries and interfaces) and their correlation to defect ions in PSCs. We achieve this by using a validated device model to fit the simulations to the experimental data of efficient vacuum-deposited p–i–n and n–i–p CH3NH3PbI3 solar cells, including the light intensity dependence of the open-circuit voltage and fill factor. We find that, despite the presence of traps at interfaces and grain boundaries (GBs), their neutral (when filled with photogenerated charges) disposition along with the long-lived nature of holes leads to the high performance of PSCs. The sign of the traps (when filled) is of little importance in efficient solar cells with compact morphologies (fused GBs, low trap density). On the other hand,...

739 citations

Journal ArticleDOI
TL;DR: A white light-emitting diode (0.33, 0.33) is fabricated using perovskite quantum dot/silica composites and is shown to have greatly improved stability.
Abstract: A white light-emitting diode (0.33, 0.33) is fabricated using perovskite quantum dot/silica composites. It is shown to have greatly improved stability.

733 citations

Journal ArticleDOI
TL;DR: Understanding of the quantum size effects in perovskite nanoplatelets and the ability to tune them provide an additional method with which to manipulate the optical properties of organometal halide perovkites.
Abstract: Organometal halide perovskites have recently emerged displaying a huge potential for not only photovoltaic, but also light emitting applications. Exploiting the optical properties of specifically tailored perovskite nanocrystals could greatly enhance the efficiency and functionality of applications based on this material. In this study, we investigate the quantum size effect in colloidal organometal halide perovskite nanoplatelets. By tuning the ratio of the organic cations used, we can control the thickness and consequently the photoluminescence emission of the platelets. Quantum mechanical calculations match well with the experimental values. We find that not only do the properties of the perovskite, but also those of the organic ligands play an important role. Stacking of nanoplatelets leads to the formation of minibands, further shifting the bandgap energies. In addition, we find a large exciton binding energy of up to several hundreds of meV for nanoplatelets thinner than three unit cells, partially ...

731 citations

Journal ArticleDOI
TL;DR: In this paper, the authors extend the classical concept of ionic tolerance factors to hybrid organic-inorganic materials and predict the existence of several hitherto undiscovered hybrid perovskite phases.
Abstract: Hybrid organic–inorganic materials that adopt perovskite-like architectures show intriguing order–disorder phase transitions and exciting electronic properties. We extend the classical concept of ionic tolerance factors to this important class of materials and predict the existence of several hitherto undiscovered hybrid perovskite phases.

729 citations

Journal ArticleDOI
TL;DR: It is shown that luminescence from Sn-based perovskite nanocrystals occurs on pico- to nanosecond time scales via two spectrally distinct radiative decay processes, which are assigned to band-to-band emission and radiative recombination at shallow intrinsic defect sites.
Abstract: Metal halide perovskite crystal structures have emerged as a class of optoelectronic materials, which combine the ease of solution processability with excellent optical absorption and emission qualities. Restricting the physical dimensions of the perovskite crystallites to a few nanometers can also unlock spatial confinement effects, which allow large spectral tunability and high luminescence quantum yields at low excitation densities. However, the most promising perovskite structures rely on lead as a cationic species, thereby hindering commercial application. The replacement of lead with nontoxic alternatives such as tin has been demonstrated in bulk films, but not in spatially confined nanocrystals. Here, we synthesize CsSnX3 (X = Cl, Cl0.5Br0.5, Br, Br0.5I0.5, I) perovskite nanocrystals and provide evidence of their spectral tunability through both quantum confinement effects and control of the anionic composition. We show that luminescence from Sn-based perovskite nanocrystals occurs on pico- to nano...

726 citations


Network Information
Related Topics (5)
Amorphous solid
117K papers, 2.2M citations
93% related
Oxide
213.4K papers, 3.6M citations
93% related
Thin film
275.5K papers, 4.5M citations
93% related
Graphene
144.5K papers, 4.9M citations
92% related
Raman spectroscopy
122.6K papers, 2.8M citations
91% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235,193
20229,857
20216,144
20205,859
20195,498
20184,741