Improved performance and stability in quantum dot solar cells through band alignment engineering
Author(s)Bawendi, Moungi G.; Chuang, Chia-Hao Marcus; Brown, Patrick Richard; Bulovic, Vladimir
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Solution processing is a promising route for the realization of low-cost, large-area, flexible and lightweight photovoltaic devices with short energy payback time and high specific power. However, solar cells based on solution-processed organic, inorganic and hybrid materials reported thus far generally suffer from poor air stability, require an inert-atmosphere processing environment or necessitate high-temperature processing [superscript 1], all of which increase manufacturing complexities and costs. Simultaneously fulfilling the goals of high efficiency, low-temperature fabrication conditions and good atmospheric stability remains a major technical challenge, which may be addressed, as we demonstrate here, with the development of room-temperature solution-processed [ZnO over PbS] quantum dot solar cells. By engineering the band alignment of the quantum dot layers through the use of different ligand treatments, a certified efficiency of 8.55% has been reached. Furthermore, the performance of unencapsulated devices remains unchanged for over 150 days of storage in air. This material system introduces a new approach towards the goal of high-performance air-stable solar cells compatible with simple solution processes and deposition on flexible substrates.
DepartmentMassachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. School of Engineering
Nature Publishing Group
Chuang, Chia-Hao M., Patrick R. Brown, Vladimir Bulovic, and Moungi G. Bawendi. “Improved Performance and Stability in Quantum Dot Solar Cells through Band Alignment Engineering.” Nature Materials 13, no. 8 (May 25, 2014): 796–801.
Author's final manuscript