1. Ensuring the Sustainability of Perovskites
Lydon Kersting ‘18

2. Perovskites
Atoms in octahedra, connected at corners in 3 directions
Methyl ammonium lead triiodide (CH3NH3PbI3)
Pros
Cons
Inexpensive
Thin
High efficiency for renewables
15-20%
Can be developed at lower temperatures
Difficult to mass-produce
Sensitive to variety of environmental factors
Can leach lead
Require thick, expensive protective layers

3. Perovskites at Princeton
Myneni Lab, Loo Lab, Princeton Institute for the Science and Technology of Materials (PRISM)
Project Aim: study how/why perovskite breaks down

4. Experiment 1
Hypothesis: we do not expect a perovskite to break down at room temperature over 2 weeks if it is not exposed to:
Light
Oxygen
Water
Excessive heat

5. Experiment 2
Hypothesis: we do not expect a perovskite to break down at room temperature over 1 week if it is exposed to 13 hours of artificial light but not exposed to:
Oxygen
Water
Excessive heat

6. Method
Perovskite spin coated & annealed by Loo Lab in N2 glovebox (< 1 ppm O2, H2O)

7. Transferred to aluminum foil covered chamber filled with N2

8. 4 2Theta/Omega XRD scans daily

9. Data/Results
No scan variation = no degradation & no reaction

10. Continuation of Project- Fall 2015
Variation of humidity
Humidity regulator
Studying behavior of different morphologies
Varied deposition method

11. Questions?