Journal
NATURE MATERIALS
Volume 13, Issue 8, Pages 796-801Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3984
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Funding
- Fannie and John Hertz Foundation
- National Science Foundation
- Samsung Advanced Institute of Technology
- National Science Foundation [DMR-08-19762]
- MIT Laser Biomedical Research Center (LBRC) - National Institute of Health [9-P41-EB015871-26A1]
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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(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/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.
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