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Evidence for formation of sub-bandgap states
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Classroom Contents
Hybrid Perovskite Solar Cells - Opportunities and Challenges
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- 1 Hybrid perovskite solar cells: Opportunities and challenges
- 2 Acknowledgements
- 3 Topics
- 4 Photovoltaics: Working principle P-N junction with light shining on it!
- 5 Motivation
- 6 Transport in nanostructured thin-films
- 7 Our strategy
- 8 Hybrid perovskites: A solution processed high quality semiconductor
- 9 Challenges in the field...
- 10 c-Si solar cell efficiency over 60 years
- 11 Other advantages of growing crystals
- 12 Higher boiling point solvents
- 13 Film Characterization
- 14 Photovoltaic device performance
- 15 Efficiency Vs Grain-size
- 16 Reproducible and hysteresis free
- 17 Nio, as hole transport layer
- 18 Evidence for suppressed recombination
- 19 Optical properties
- 20 Pure bimolecular recombination
- 21 Stability is an critical issue....
- 22 Our experiment
- 23 Device performance with constant illumination
- 24 Charge injection does not degradation- Light-activation required
- 25 No evidence for structural degradation
- 26 Evidence for trapped charge
- 27 Photocurrent transient measurements
- 28 Recovery of PL signal at RT
- 29 Light-induced formation of trap states
- 30 Evidence for formation of sub-bandgap states
- 31 Formation of light-activated trap states
- 32 Fast photocurrent recovery in dark
- 33 Photocurrent recovery and temperature dependence of efficiency
- 34 What are layered perovskites?
- 35 Challenges in layered perovskite
- 36 What about layered 2D perovskites? (in collaboration with Kanatzidis group Northwestern)
- 37 Breakthrough efficiency in planar geometry
- 38 Hysteresis tests
- 39 Stability of 3D vs. 2D perovskites
- 40 Summary
