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
Description:
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.
Read more
Hybrid Perovskite Solar Cells - Opportunities and Challenges