Related Experiment Video
Updated: Feb 3, 2026
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
13.6K
Photostability and Photodegradation Processes in Colloidal CsPbI3 Perovskite Quantum Dots
Rui An1, Fengying Zhang2, Xianshao Zou
1Department of Chemistry "G. Ciamician" , University of Bologna , Via F. Selmi 2 , 40126 Bologna , Italy.
ACS Applied Materials & Interfaces
|October 24, 2018
Summary
Light exposure degrades cesium lead iodide perovskite quantum dots (QDs), causing surface collapse and aggregation. This photodegradation quenches photoluminescence, hindering their use in optoelectronics and photovoltaics.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- All-inorganic cesium lead iodide perovskite quantum dots (CsPbI3 QDs) show promise for photovoltaics (PVs) and optoelectronics due to excellent optical properties.
- Photostability issues currently limit the practical application of CsPbI3 QDs.
Purpose of the Study:
- To investigate the photostability of colloidal CsPbI3 QDs under light illumination.
- To elucidate the structural and photophysical mechanisms underlying CsPbI3 QD photodegradation.
Main Methods:
- Steady-state spectroscopy
- X-ray diffraction (XRD)
- Fourier transform infrared spectroscopy (FTIR)
- Transmission electron microscopy (TEM)
- Transient absorption spectroscopy (TAS)
Main Results:
- Light illumination induces photodegradation of CsPbI3 QDs.
- Photodegradation involves capping agent detachment, surface collapse, and aggregation of surface lead (Pb0).
- Surface defects and Pb0 act as trap states, leading to photoluminescence (PL) quenching and reduced PL quantum yield.
Conclusions:
- Detailed insights into the structural and photophysical consequences of CsPbI3 QD photodegradation were obtained.
- Understanding these degradation pathways is crucial for optimizing CsPbI3 QDs for device applications.
Related Concept Videos
03:22Colloids
21.1K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
21.1K
02:43Quantum Numbers
50.1K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
50.1K
02:45The Quantum-Mechanical Model of an Atom
57.3K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
57.3K
01:17Colloids and Suspensions
3.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
3.4K
01:09Colloidal precipitates
6.5K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
6.5K
01:29Dot Product
966
The dot product is an essential concept in mathematics and physics.
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
966