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  4. Mechanoperovskites for Photovoltaic Applications: Preparation, Characterization, and Device Fabrication
 
review article

Mechanoperovskites for Photovoltaic Applications: Preparation, Characterization, and Device Fabrication

Prochowicz, Daniel  
•
Saski, Marcin
•
Yadav, Pankaj
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November 1, 2019
Accounts Of Chemical Research

Hybrid organic-inorganic metal halide perovskites (MHPs) have emerged as excellent absorber materials for next generation solar cells owing to their simple solution-processed synthesis and high efficiency. This breakthrough in photovoltaics along with an accompanying impact in light-emitting applications prompted a renaissance of interest in the broad family of MHPs. Notably, the optoelectronic properties and the photovoltaic parameters of MHPs are highly sensitive to the adopted synthetic strategy. The preparation of MHPs has commonly relied on solution-based methods requiring elevated temperatures for homogeneity of reaction mixtures. While the solution-based approach is relatively versatile, it faces challenges such as limitations in compositional engineering of MHPs or their long-term storage among others. Therefore, there is a continuous great challenge to develop efficient synthetic strategies affording various high-quality MHP materials for numerous technological optoelectronic applications.

In the past decade, mechanochemistry has appeared as a green alternative to traditional synthesis. This solid-state, re-emerging efficient synthetic methodology mediated by direct absorption of mechanical energy is growing explosively across organic and inorganic chemistry and materials science. In this Account, we describe our shared interest in the productive use of mechanical force in chemistry of MHPs, as well as assembly of the respective solar cell devices. We highlight the milestones achieved by our groups along with the seminal contributions by other groups. In particular, we demonstrate that mechanochemistry efficiently allows the formation of various phase pure hybrid lead and lead-free halide perovskite compositions (called hereafter "mechanoperovskites"). The progress in solvent-free solid-state synthesis is greatly enhanced by the integration of advanced methods of solid-state analysis like powder X-ray diffraction (pXRD), solid-state nuclear magnetic resonance (ss-NMR) and UV-vis spectroscopies, and we aim to illustrate this ongoing integration through appropriate examples. Furthermore, we show that thin films based on mechanoperovskites have the advantage of providing a higher degree of control of the stoichiometry and higher reproducibility, stability, and material phase purity. The impact of using powdered mechanoperovskite as a precursor for thin film formation on the electrochemical and photovoltaic properties of the solar cells is also discussed. Finally, our view of current challenges and future directions in this emerging interdisciplinary area of research is provided.

  • Details
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Type
review article
DOI
10.1021/acs.accounts.9b00454
Web of Science ID

WOS:000498287700023

Author(s)
Prochowicz, Daniel  
Saski, Marcin
Yadav, Pankaj
Gratzel, Michael  
Lewinski, Janusz
Date Issued

2019-11-01

Publisher

AMER CHEMICAL SOC

Published in
Accounts Of Chemical Research
Volume

52

Issue

11

Start page

3233

End page

3243

Subjects

Chemistry, Multidisciplinary

•

Chemistry

•

mixed halide perovskites

•

mechanochemical synthesis

•

hybrid perovskites

•

performance

•

mechanosynthesis

•

construction

•

nanocrystals

•

guanidinium

•

strategy

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
December 5, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/163578
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