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- Title
Improved performance and stability in quantum dot solar cells through band alignment engineering.
- Authors
Chuang, Chia-Hao M.; Brown, Patrick R.; Bulović, Vladimir; Bawendi, Moungi G.
- Abstract
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, 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/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.
- Subjects
QUANTUM dot devices; SOLAR cells; FABRICATION (Manufacturing); HIGH temperature electronics; NANOCRYSTALS
- Publication
Nature Materials, 2014, Vol 13, Issue 8, p796
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat3984