Seminar Series:
Harshani RathnaweeraUniversity of Georgia, Department of Chemistry
Monday, October 31, 2016 - 11:15am
Chemistry Building, Room 400

Solar power is a promising renewable energy source for the rising world energy demand due to its wide availability, low cost and less environmental impact1.  The conversion of solar energy into electricity can be done using a solar cell which is typically fabricated with silicon as the semiconductor material. Using silicon, however, presents limitations due to its expensive, multi-step, and high temperature fabrication processes1. Recently, hybrid organic-inorganic halide perovskites have attracted a significant amount of attention as emerging photovoltaic materials owing to their high absorption coefficient, high carrier mobility, long carrier diffusion length and solution based fabrication2. In addition, perovskite solar cells (PSC) have shown success in boosting the power conversion efficiency from 3.8%3 to 20.1%4 over the past six years, which is favorable for their future implementation in devices. However, the instability of the perovskite layer to moisture and the lead toxicity have limited the commercial applications of PSC5. This talk will discuss current research on organic-inorganic lead halide PSC with specific focus on promising stability enhancement methods that improve the durability of these materials6,7,8.

 

1. Sharma, S.; Jain, K. K.; Sharma, A. Solar Cells: In Research and Applications-A Review. Mater. Sci. Appl. 2015, 6, 1145-1155.

2. Wang, D.; Wright, M.; Elumalai, N. K.; Uddin, A. Stability of Perovskite Solar Cells. Sol. Energ. Mat. Sol. C. 2016, 147, 255-275.

3. Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells. J. Am. Chem. Soc. 2009, 131, 6050-6051.

4. Yang, W. S.; Noh, J. H.; Jeon, N. J.; Kim, Y. C.; Ryu, S.; Seo, J.; Seok, S. High Performance Photovoltaic Perovskite Layers Fabricated Through Intramolecular Exchange. Science 2015, 348, 1234-1237.

5. Zhao, X.; Park, N. Stability Issues on Perovskite Solar Cells. Photonics 2015, 2, 1139-1151.

6. Hwang, I.; Jeong, I.; Lee, J.; Ko, M. J.; Yong, K. Enhancing Stability of Perovskite Solar Cells to Moisture by the Facile Hydrophobic Passivation. ACS Appl. Mater. Interfaces 2015, 7, 17330-17336.

7. Smith, I. C.; Hoke, E. T.; Solis-Ibarra, D.; McGehee, M. D.; Karunadasa, H. I. A Layered Hybrid Perovskite Solar-Cell Absorber with Enhanced Moisture Stability. Angew. Chem. Int. Ed. 2014, 53, 11232-11235.

8. Jiang, Q.; Rebollar, D.; Gong, J.; Piacentino, E. L.; Zheng, C.; Xu, T. Pseudohalide-Induced Moisture Tolerance in Perovskite CH3NH3Pb(SCN)2I Thin Films. Angew. Chem. Int. Ed. 2015, 54, 7617-7620.