Keyword Suggestions

Results
 
 
Account Login
 
 
 
 
 

Library Navigation

 
 

Browse Meetings

 
 
 
EE16.2.02 - Hybrid Perovskite Solar Cells: Opportunities and Challenges  
Date/Time:
March 30, 2016   8:00am - 5:00pm
 
Speaker:
 
Taxonomy
 
 
 
Share:
 

Photovoltaic industry today is one of the most rapidly growing sectors in the United States and is anticipated to capture 10% of the total renewable energy produced by 2020. However, cost/PV efficiency remains one of the key challenges for its ubiquitous deployment. Solution processing of semiconductor and nanomaterial thin-films provides a direct route to reduce the costs. However second and third generation solar cell technologies, in spite of extensive development for over 25 years has been limited due to the inadequate power conversion efficiency (PCE~10%) A fundamental critical bottleneck of wet-lab processed thin-film technologies is the material’s polydispersity that leads to the presence of multiple interfaces and defects/trap sites resulting in high carrier losses and low stability. Recent discovery of organic-inorganic (also known as hybrid) perovskites such as CH3NH3PbX3 (X = Cl, Br, I) for photovoltaic devices has reached 20% in merely 3-5 years and offer extraordinary potential for clean sustainable energy technologies and in general low-cost optoelectronic devices. In spite of the recent progress there exists tremendous variability in the structural and optoelectronic properties of the hybrid perovskite thin-films across the globe. Crystallinity, defect density and impurities are in general determining factors for optoelectronic properties, which are also highly dependent on the materials formation processes. Apart from these the stability and reliability of perovskite based devices remains open questions and perhaps will determine the fate of this remarkable technology in the longer run.
In this talk, I will describe our recent work on a novel solution-processing technique termed as “hot-casting” to grow continuous, pin-hole free thin-films of organometallic perovskites with millimeter-scale crystalline grains. Photovoltaic devices show hysteresis-free response, with high degree of reproducibility, thus overcoming a fundamental bottleneck for hybrid perovskite devices. Characterization and modeling attribute the improved performance to reduced bulk defects and improved charge-carrier mobility in large-grain devices. In addition, I will describe our most recent efforts on understanding the controlling photo-degradation in these systems. Results demonstrate that the large grain-size perovskite thin-films are not limited by detrimental effects such as ion migration or defect assisted trapping generally reported in perovskite thin-film devices allowing us to probe intrinsic photo-physical processes that lead to the degradation of PCE in perovskite solar cells.
 
 


 
 
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
 
The Materials Project: Using Informatics to Enable Materials by Design
Incorporating Sustainability Principles into Your Research
Panel Discussion: Industry Perspectives on Sustainability Across the Supply Chain: Challenges and Opportunities
Materials and Sustainable Development
Redox Active Metal Oxide-Based Solar Thermochemical Fuels: Issues of Materials Challenges, Efficiency, Scale, and Economics