Tracking Structural Phase Transitions in Lead-Halide Perovskites by Means of Thermal Expansion.

Clicks: 398
ID: 54552
2019
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Steady

Ranked #17 of 80 articles by views in advanced materials (deerfield beach, fla)

Most read Least read

Bar heights use a square-root scale.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
The extraordinary properties of lead-halide perovskite materials have spurred intense research, as they have a realistic perspective to play an important role in future photovoltaic devices. It is known that these materials undergo a number of structural phase transitions as a function of temperature that markedly alter their optical and electronic properties. The precise phase transition temperature and exact crystal structure in each phase, however, are controversially discussed in the literature. The linear thermal expansion of single crystals of APbX (A = methylammonium (MA), formamidinium (FA); X = I, Br) below room temperature is measured using a high-resolution capacitive dilatometer to determine the phase transition temperatures. For δ-FAPbI , two wide regions of negative thermal expansion below 173 and 54 K, and a cascade of sharp transitions for FAPbBr that have not previously been reported are uncovered. Their respective crystal phases are identified via powder X-ray diffraction. Moreover, it is demonstrated that transport under steady-state illumination is considerably altered at the structural phase transition in the MA compounds. The results provide advanced insights into the evolution of the crystal structure with decreasing temperature that are essential to interpret the growing interest in investigating the electronic, optical, and photonic properties of lead-halide perovskite materials.
Reference Key
keshavarz2019trackingadvanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Keshavarz, Masoumeh;Ottesen, Martin;Wiedmann, Steffen;Wharmby, Michael;Küchler, Robert;Yuan, Haifeng;Debroye, Elke;Steele, Julian A;Martens, Johan;Hussey, Nigel E;Bremholm, Martin;Roeffaers, Maarten B J;Hofkens, Johan;
Journal advanced materials (deerfield beach, fla)
Year 2019
DOI
10.1002/adma.201900521
URL
Keywords
perovskites structural phase transitions thermal expansion

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.