Hybrid Perovskite Solar Cells - Opportunities and Challenges

Explore the opportunities and challenges of hybrid perovskite solar cells in this 47-minute talk from the 2016 MRS Spring Meeting. Delve into Dr. Aditya Mohite's research on a novel "hot-casting" solution-processing technique for growing continuous, pin-hole free thin-films of organometallic perovskites with millimeter-scale crystalline grains. Learn about the hysteresis-free response and high reproducibility of photovoltaic devices, overcoming a fundamental bottleneck in hybrid perovskite technology. Discover how reduced bulk defects and improved charge-carrier mobility in large-grain devices contribute to enhanced performance through characterization and modeling. Gain insights into various aspects of hybrid perovskites, including their advantages, challenges, film characterization, device performance, efficiency, stability issues, and the potential of layered 2D perovskites. Understand the working principles of photovoltaics, transport in nanostructured thin-films, and the critical role of stability in perovskite solar cells.

Hybrid perovskite solar cells: Opportunities and challenges
Acknowledgements
Topics
Photovoltaics: Working principle P-N junction with light shining on it!
Motivation
Transport in nanostructured thin-films
Our strategy
Hybrid perovskites: A solution processed high quality semiconductor
Challenges in the field...
c-Si solar cell efficiency over 60 years
Other advantages of growing crystals
Higher boiling point solvents
Film Characterization
Photovoltaic device performance
Efficiency Vs Grain-size
Reproducible and hysteresis free
Nio, as hole transport layer
Evidence for suppressed recombination
Optical properties
Pure bimolecular recombination
Stability is an critical issue....
Our experiment
Device performance with constant illumination
Charge injection does not degradation- Light-activation required
No evidence for structural degradation
Evidence for trapped charge
Photocurrent transient measurements
Recovery of PL signal at RT
Light-induced formation of trap states
Evidence for formation of sub-bandgap states
Formation of light-activated trap states
Fast photocurrent recovery in dark
Photocurrent recovery and temperature dependence of efficiency
What are layered perovskites?
Challenges in layered perovskite
What about layered 2D perovskites? (in collaboration with Kanatzidis group Northwestern)
Breakthrough efficiency in planar geometry
Hysteresis tests
Stability of 3D vs. 2D perovskites
Summary