Keyword Suggestions

Results
 
 
Account Login
 
 
 
 
 

Library Navigation

 
 

Browse Meetings

 
 
 
W4.03 - Photoluminescence from Organometal Halide Perovskites: Excitons, Free Charge Carriers and Sub-Gap Electronic States 
Date/Time:
December 2, 2014   9:00am - 9:15am
 
Speaker:
 
Taxonomy
 
 
 
 
 
Share:
 

Organic-inorganic perovskites are attracting increasing attention for their use in high-performance solar cells. Nevertheless, detailed understanding of charge generation, interplay of excitons and free charge carriers, and recombination pathways, crucial for further device improvement, are still incomplete. In this work we present a very generic yet analytically solvable model describing both equilibrium properties of free charge carriers and excitons in the presence of electronic sub-gap trap states, and their kinetics after photo-excitation, in the perovskite CH3NH3PbI3-xClx. At low fluences the charge trapping pathways limit the photoluminescence quantum efficiency whereas at high fluences the traps are predominantly filled and recombination of the photo-generated species is dominated by efficient radiative bimolecular processes. The model is able to reproduce the time-resolved photoluminescence decays and photoluminescence quantum efficiencies, which we show approach 100% at low temperatures and at high fluences. The results from the model strongly indicate that the trap concentration increases with increasing temperature, suggesting an intrinsic origin of trap states. Our work provides an understanding of how to further enhance the material performance for high-efficiency perovskite solar cells and light-emitting diodes.
 


 
 
Average Rating: (No Ratings)
  Was great, surpassed expectations, and I would recommend this
  Was good, met expectations, and I would recommend this
  Was okay, met most expectations
  Was okay but did not meet expectations
  Was bad and I would not recommend this
 



Submit
 
Processing Conditions, Alternative Top Contacts and Device Operation of Pervoskite-Based Solar Cells
Performance Enhancement of Pentacene Based Organic Field-Effect Transistor through DNA Interlayer
Semiconducting Polymer-Dipeptide Nanostructures by Ultrasonically-Assisted Self-Assembling
DNA as a Molecular Wire: Distance and Sequence Dependence
Structure-Property Relationship in Biologically-Derived Eumelanin Cathodes Electrochemical Energy Storage